diff --git a/bin/eesyphp b/bin/eesyphp
index 57f7316..cea5a5a 100755
--- a/bin/eesyphp
+++ b/bin/eesyphp
@@ -5,4 +5,4 @@ require realpath(dirname(__FILE__).'/..')."/includes/core.php";
 if (is_callable('handle_cli_args'))
   handle_cli_args();
 else
-  logging('FATAL', "An error occured initializing CLI : handle_cli_args() function not found.");
+  Log :: fatal("An error occured initializing CLI : handle_cli_args() function not found.");
diff --git a/composer.json b/composer.json
index acd05e5..ec2dec3 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,14 @@
             "email": "info@easter-eggs.com"
         }
     ],
+    "autoload": {
+        "psr-4": {
+            "EesyPHP\\": "src/"
+        },
+        "files": [
+            "src/functions.php"
+        ]
+    },
     "require": {
         "envms/fluentpdo": "^1.1",
         "pear/console_table": "^1.3",
diff --git a/includes/cli.php b/includes/cli.php
index 8ada725..bfad4ed 100644
--- a/includes/cli.php
+++ b/includes/cli.php
@@ -1,16 +1,19 @@
 <?php
 
+use EesyPHP\Check;
+use EesyPHP\Log;
+
 $cli_commands=array();
 function add_cli_command($command, $handler, $short_desc, $usage_args=false, $long_desc=false,
                          $override=false) {
   global $cli_commands;
   if (array_key_exists($command, $cli_commands) && !$override) {
-    logging('ERROR', _("The CLI command '%s' already exists."), $command);
+    Log :: error(_("The CLI command '%s' already exists."), $command);
     return False;
   }
 
   if (!is_callable($handler)) {
-    logging('ERROR', _("The CLI command '%s' handler is not callable !"), $command);
+    Log :: error(_("The CLI command '%s' handler is not callable !"), $command);
     return False;
   }
 
@@ -135,8 +138,8 @@ function handle_cli_args() {
   if (!$cli_command)
     usage();
 
-  logging(
-    'DEBUG', "Run %s command %s with argument(s) '%s'.",
+  Log :: debug(
+    "Run %s command %s with argument(s) '%s'.",
     basename($argv[0]), $cli_command, implode("', '", $command_args)
   );
 
@@ -146,7 +149,7 @@ function handle_cli_args() {
     exit($result?0:1);
   }
   catch(Exception $e) {
-    log_exception($e, _("An exception occured running command %s"), $cli_command);
+    Log :: exception($e, _("An exception occured running command %s"), $cli_command);
     exit(1);
   }
 }
@@ -208,7 +211,7 @@ function cli_list($command_args) {
 
   $items = search_items($params);
   if (!is_array($items)) {
-    logging("ERROR", "Invalid DB info return.\n");
+    Log :: error("Invalid DB info return.\n");
     return False;
   }
 
@@ -257,14 +260,14 @@ add_cli_command(
 );
 
 function cli_show($command_args) {
-  if (count($command_args) != 1 || !check_id($command_args[0]))
+  if (count($command_args) != 1 || !Check :: id($command_args[0]))
     usage(_('You must provide a valid ID.'));
 
   $item_id = $command_args[0];
   $item = get_item($item_id);
 
   if (!$item)
-    logging('FATAL', _("Item #%s not found."), $item_id);
+    Log :: fatal(_("Item #%s not found."), $item_id);
 
   print_item_info($item);
   return True;
@@ -281,14 +284,14 @@ function cli_delete($command_args) {
     usage(_('You must provide item ID.'));
 
   // Check URI
-  if (!check_id($command_args[0]))
-    logging('FATAL', _("Invalid item ID"));
+  if (!Check :: id($command_args[0]))
+    Log :: fatal(_("Invalid item ID"));
 
   // Check exist
   $item_id = $command_args[0];
   $item = get_item($item_id);
   if (!$item)
-    logging('FATAL', _("Item #%s not found."), $item_id);
+    Log :: fatal(_("Item #%s not found."), $item_id);
 
   print_item_info($item);
 
@@ -297,13 +300,13 @@ function cli_delete($command_args) {
   $handle = fopen ("php://stdin","r");
   $line = fgets($handle);
   if(trim($line) != 'yes'){
-    logging('WARNING', _("User cancel"));
+    Log :: warning(_("User cancel"));
     exit;
   }
   echo "\n";
 
   if (!delete_item($item['id']))
-    logging('FATAL', _("An error occured deleting item #%d."), $item_id);
+    Log :: fatal(_("An error occured deleting item #%d."), $item_id);
 
   return True;
 }
@@ -318,7 +321,7 @@ function cli_export($command_args) {
   $fd = fopen((count($command_args) >= 1?$command_args[0]:'php://output'), 'w');
   export_items($fd);
   fclose($fd);
-  logging('INFO', "Items export to '".(count($command_args) >= 1?$command_args[0]:'STDOUT')."'.");
+  Log :: info("Items export to '".(count($command_args) >= 1?$command_args[0]:'STDOUT')."'.");
 }
 add_cli_command(
   'export',
@@ -331,8 +334,8 @@ function cli_restore($command_args) {
   $fd = fopen((count($command_args) >= 1?$command_args[0]:'php://stdin'), 'r');
   restore_items($fd);
   fclose($fd);
-  logging(
-    'INFO', "Items restored from '%s'",
+  Log :: info(
+    "Items restored from '%s'",
     (count($command_args) >= 1?$command_args[0]:'STDIN')
   );
 }
@@ -354,7 +357,7 @@ function cli_cron($command_args) {
       case '-m':
       case '--max-age':
         $i++;
-        if(!check_id($command_args[$i]))
+        if(!Check :: id($command_args[$i]))
           usage('Invalid -m|--max-age clause');
         $item_max_age = $command_args[$i];
         break;
@@ -368,37 +371,36 @@ function cli_cron($command_args) {
   }
 
   if (!is_int($item_max_age) || $item_max_age <= 0)
-    logging(
-      'FATAL',
+    Log :: fatal(
       'Invalid $item_max_age value set in configuration: it\'s must be a positive integer.');
-  logging('DEBUG', "cli_cron(): item max age = $item_max_age day(s)");
+  Log :: debug("cli_cron(): item max age = $item_max_age day(s)");
 
   $limit = time() - ($item_max_age * 86400);
-  logging('DEBUG', "Handle items expiration with creation date limit ".format_time($limit).".");
+  Log :: debug("Handle items expiration with creation date limit ".format_time($limit).".");
 
   $items = search_items(array('all' => true));
   $error = false;
   foreach($items['items'] as $item) {
     if ($item['date'] < $limit) {
       if ($just_try) {
-        logging('DEBUG', 'Just-try mode: do not really delete item #%s (%s, creation date: %s)',
+        Log :: debug('Just-try mode: do not really delete item #%s (%s, creation date: %s)',
           $item['id'], $item['name'], format_time($item['date'])
         );
       }
       else if (delete_item($item['id'])) {
-        logging('INFO', 'Item #%s (%s) deleted (creation date: %s)',
+        Log :: info('Item #%s (%s) deleted (creation date: %s)',
           $item['id'], $item['name'], format_time($item['date'])
         );
       }
       else {
-        logging('ERROR', 'Fail to delete item "%s" (%s, creation date: %s)',
+        Log :: error('Fail to delete item "%s" (%s, creation date: %s)',
           $item['id'], $item['name'], format_time($item['date'])
         );
         $error = true;
       }
     }
     else {
-      logging('DEBUG', 'Item "%s" (%s) still valid (creation date: %s)',
+      Log :: debug('Item "%s" (%s) still valid (creation date: %s)',
         $item['id'], $item['name'], format_time($item['date'])
       );
     }
diff --git a/includes/core.php b/includes/core.php
index b0c77df..70affbb 100644
--- a/includes/core.php
+++ b/includes/core.php
@@ -1,5 +1,7 @@
 <?php
 
+use EesyPHP\Log;
+
 error_reporting(E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED);
 
 // Root directory path
@@ -43,7 +45,13 @@ $sentry_span = new SentrySpan('core.init', 'Core initialization');
 if (isset($upload_tmp_dir))
   ini_set('upload_tmp_dir', $upload_tmp_dir);
 
-require_once('logging.php');
+if (!isset($log_file))
+  die('Log file path not configured');
+Log::init(
+  $log_file,
+  isset($log_level)?$log_level:null,
+  isset($log_php_errors_levels)?$log_php_errors_levels:null
+);
 require_once('functions.php');
 require_once('session.php');
 
diff --git a/includes/db.php b/includes/db.php
index 621e199..7067767 100644
--- a/includes/db.php
+++ b/includes/db.php
@@ -1,9 +1,10 @@
 <?php
 
+use EesyPHP\Log;
 use Unidecode\Unidecode;
 
 if (!isset($db_dsn)) {
-  logging('FATAL', 'Database DSN not configured');
+  Log :: fatal('Database DSN not configured');
   exit(1);
 }
 
@@ -33,12 +34,12 @@ try {
       }
     }
 
-    logging('DEBUG',$msg);
+    Log :: debug($msg);
   };
 }
 catch(Exception $e) {
-  logging('ERROR',"Fail to connect to DB (DSN : '$db_dsn') : ".$e->getMessage());
-  logging("FATAL", _('Unable to connect to the database.'));
+  Log :: error("Fail to connect to DB (DSN : '$db_dsn') : ".$e->getMessage());
+  Log :: fatal(_('Unable to connect to the database.'));
 }
 
 /*
@@ -111,7 +112,7 @@ function get_items($orderby='id', $raw_values=false) {
     }
   }
   catch (Exception $e) {
-    logging('ERROR', "Error retreiving items info from database : ".$e->getMessage());
+    Log :: error("Error retreiving items info from database : ".$e->getMessage());
   }
   return false;
 }
@@ -134,7 +135,7 @@ function get_item($id, $raw_values=false) {
     }
   }
   catch (Exception $e) {
-    logging('ERROR', "Error retreiving item #$id info from database : ".$e->getMessage());
+    Log :: error("Error retreiving item #$id info from database : ".$e->getMessage());
   }
   return false;
 }
@@ -149,13 +150,13 @@ function add_item($values) {
 
     if ($result !== false) {
       $item = get_item($result);
-      logging('INFO', "New item #$result added");
+      Log :: info("New item #$result added");
       trigger_hook('item_added', $item);
       return $item;
     }
   }
   catch (Exception $e) {
-    logging('ERROR', "Error creating item in database : ".$e->getMessage());
+    Log :: error("Error creating item in database : ".$e->getMessage());
   }
   return false;
 }
@@ -180,20 +181,20 @@ function update_item($id, $changes) {
                     -> execute();
 
     if ($result !== false) {
-      logging('INFO', "Item #$id updated");
+      Log :: info("Item #$id updated");
       trigger_hook('item_updated', $item);
       return true;
     }
   }
   catch (Exception $e) {
-    logging('ERROR', "Error updating item #$id in database : ".$e->getMessage());
+    Log :: error("Error updating item #$id in database : ".$e->getMessage());
   }
   return false;
 }
 
 function change_item_status($id, $status) {
   if (update_item($id, array('status' => $status))) {
-    logging('INFO', "Status of item #$id changed to $status.");
+    Log :: info("Status of item #$id changed to $status.");
     return true;
   }
   return false;
@@ -211,12 +212,12 @@ function delete_item($id) {
                     -> execute();
 
     if ($result !== false) {
-      logging('INFO', "Item #$id deleted");
+      Log :: info("Item #$id deleted");
       return True;
     }
   }
   catch (Exception $e) {
-    logging('ERROR', "Error deleting item #$id from database : ".$e->getMessage());
+    Log :: error("Error deleting item #$id from database : ".$e->getMessage());
   }
   return false;
 }
@@ -308,7 +309,7 @@ function search_items($params) {
           -> execute();
 
     if ($result === false) {
-      logging('ERROR', 'search_items() : search in DB return false');
+      Log :: error('search_items() : search in DB return false');
       return false;
     }
 
@@ -344,7 +345,7 @@ function search_items($params) {
     $result_count = $query_count -> execute();
 
     if ($result_count === false) {
-      logging('DEBUG', 'search_items() : search for count in DB return false');
+      Log :: debug('search_items() : search for count in DB return false');
       return False;
     }
     $count = $result_count -> fetch();
@@ -360,7 +361,7 @@ function search_items($params) {
     );
   }
   catch (Exception $e) {
-    log_exception(
+    Log :: exception(
       $e, "An exception occured searching items with params %s infos from database : ",
       preg_replace("/\n[ \t]*/", " ", print_r($params, true))
     );
@@ -403,12 +404,12 @@ function restore_items($fd=null) {
     $result = $fpdo -> deleteFrom('item')
         -> execute();
     if ($result === false) {
-      logging('ERROR', "An unknown error occured truncating item table in database.");
+      Log :: error("An unknown error occured truncating item table in database.");
       return false;
     }
   }
   catch (Exception $e) {
-    logging('ERROR', "Error truncating item table in database : ".$e->getMessage());
+    Log :: error("Error truncating item table in database : ".$e->getMessage());
     return false;
   }
 
@@ -450,18 +451,17 @@ function restore_items($fd=null) {
         $restored++;
       }
       else {
-        logging('ERROR', "Unkwown error occured restoring item from line #$line :\n".print_r($values, true));
+        Log :: error("Unkwown error occured restoring item from line #$line :\n".print_r($values, true));
         $error = true;
       }
     }
     catch (Exception $e) {
-      logging(
-        'ERROR',
+      Log :: error(
         "Error restoring item from line #$line : ".$e->getMessage()."\n".print_r($values, true));
       $error = true;
     }
   }
-  logging('INFO', "$restored items restored");
+  Log :: info("$restored items restored");
 
   // Trigger hooks
   trigger_hook('items_restored');
diff --git a/includes/functions.php b/includes/functions.php
index 1056df1..2a86c88 100644
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -1,85 +1,16 @@
 <?php
 
+use EesyPHP\Check;
+use EesyPHP\Log;
+
 /*
  * Check values helpers
  */
-function check_name($name) {
-  if (preg_match('/^[\w \-]{2,}$/iu',$name))
-    return true;
-  return false;
-}
-
-function check_id(&$id) {
-  if (is_int($id))
-    return true;
-  if (preg_match('/^[0-9]+$/', $id)) {
-    $id = intval($id);
-    return true;
-  }
-  return false;
-}
-
-function check_search_pattern($pattern) {
-  foreach(preg_split('/\s+/', trim($pattern)) as $word) {
-    if (!check_id($word) && !check_name($word))
-      return false;
-  }
-  return true;
-}
-
-function check_time(&$time) {
-  if (!is_int($time)) {
-    if (preg_match('/^[0-9]+$/', $time))
-      $time = intval($time);
-    else
-      return false;
-  }
-  return ($time >= 1577833200);  // 2020-01-01 - date of birth of this soft
-}
-
 function check_status($status) {
   global $status_list;
   return array_key_exists($status, $status_list);
 }
 
-function check_description($comment) {
-  if (preg_match("/^[\p{L}0-9\p{P}\p{Zs}\p{Zl}\p{Sc}\=\+]+$/uim", $comment))
-    return true;
-  return false;
-}
-
-function check_email($value, $domain=NULL, $checkDns=true) {
-  $regex = '/^((\"[^\"\f\n\r\t\v\b]+\")|([\w\!\#\$\%\&\'\*\+\-\~\/\^\`\|\{\}]+(\.[\w\!\#\$\%\&\'\*\+\-\~\/\^\`\|\{\}]+)*))@((\[(((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9])))\])|(((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9])))|((([A-Za-z0-9\-])+\.)+[A-Za-z\-]+))$/';
-
-  if (!preg_match($regex, $value)) {
-    return false;
-  }
-
-  $nd = explode('@', $value);
-  $nd=$nd[1];
-
-  if ($domain) {
-    if(is_array($domain)) {
-      if (!in_array($nd,$domain)) {
-        return false;
-      }
-    }
-    else {
-      if($nd!=$domain) {
-        return false;
-      }
-    }
-  }
-
-  if ($checkDns && function_exists('checkdnsrr')) {
-    if (!(checkdnsrr($nd, 'MX') || checkdnsrr($nd, 'A'))) {
-      return false;
-    }
-  }
-
-  return true;
-}
-
 /*
  * Handling item POST data
  */
@@ -87,11 +18,11 @@ function handle_item_post_data(&$info, $enabled_fields=null, $required_fields=nu
                                &$changes=null) {
   $field_errors=array();
   if (isset($_POST['submit'])) {
-    logging('DEBUG', 'POST data : '.vardump($_POST));
+    Log :: debug('POST data : '.vardump($_POST));
     // Name
     if (!$enabled_fields || in_array('name', $enabled_fields)) {
       if (isset($_POST['name'])) {
-        if (check_name($_POST['name'])) {
+        if (Check :: name($_POST['name'])) {
           $info['name'] = $_POST['name'];
         }
         else {
@@ -118,10 +49,10 @@ function handle_item_post_data(&$info, $enabled_fields=null, $required_fields=nu
       isset($_POST['description']) &&
       (!$enabled_fields || in_array('description', $enabled_fields))
     ) {
-      if (check_is_empty(trim($_POST['description']))) {
+      if (Check :: is_empty(trim($_POST['description']))) {
         $info['description'] = null;
       }
-      else if (check_description($_POST['description'])) {
+      else if (Check :: description($_POST['description'])) {
         $info['description'] = $_POST['description'];
       }
       else {
@@ -135,7 +66,7 @@ function handle_item_post_data(&$info, $enabled_fields=null, $required_fields=nu
     foreach ($required_fields as $field) {
       if (array_key_exists($field, $field_errors))
         continue;
-      if (array_key_exists($field, $info) && !is_null($info[$field]) && !check_is_empty($info))
+      if (array_key_exists($field, $info) && !is_null($info[$field]) && !Check :: is_empty($info))
         continue;
       $field_errors[$field] = "Cette information est obligatoire.";
     }
@@ -251,23 +182,6 @@ function format_callable($callable) {
   return vardump($callable);
 }
 
-function check_is_empty($val) {
-  switch(gettype($val)) {
-    case "boolean":
-    case "integer":
-    case "double":
-    case "object":
-    case "resource":
-      return False;
-    case "array":
-    case "string":
-      if ($val == "0") return false;
-      return empty($val);
-    case "NULL":
-      return True;
-  }
-}
-
 /*
  * Generic file/directory helpers
  */
@@ -308,18 +222,18 @@ function delete_directory($dir, $recursive=true) {
     foreach ($files as $file) {
       if (is_dir("$dir/$file")) {
         if (!delete_directory("$dir/$file", true)) {
-          logging('ERROR', "delete_directory($dir) : Fail to delete sub-directory '$dir/$file'.");
+          Log :: error("delete_directory($dir) : Fail to delete sub-directory '$dir/$file'.");
           return false;
         }
       }
       else if (!unlink("$dir/$file")) {
-        logging('ERROR', "delete_directory($dir) : Fail to delete '$dir/$file'.");
+        Log :: error("delete_directory($dir) : Fail to delete '$dir/$file'.");
         return false;
       }
     }
   }
   else if (!empty($files)) {
-    logging('ERROR', "delete_directory($dir) : Directory is not empty.");
+    Log :: error("delete_directory($dir) : Directory is not empty.");
     return false;
   }
   return rmdir($dir);
@@ -345,7 +259,7 @@ function run_external_command($command, $data_stdin=null, $escape_command_args=t
     $command = implode(' ', $command);
   if ($escape_command_args)
     $command = escapeshellcmd($command);
-  logging('DEBUG', "Run external command: '$command'");
+  Log :: debug("Run external command: '$command'");
   $descriptorspec = array(
     0 => array("pipe", "r"),  // stdin
     1 => array("pipe", "w"),  // stdout
@@ -354,7 +268,7 @@ function run_external_command($command, $data_stdin=null, $escape_command_args=t
   $process = proc_open($command, $descriptorspec, $pipes);
 
   if (!is_resource($process)) {
-    logging('ERROR', "Fail to run external command: '$command'");
+    Log :: error("Fail to run external command: '$command'");
     return false;
   }
 
@@ -372,7 +286,7 @@ function run_external_command($command, $data_stdin=null, $escape_command_args=t
   $return_value = proc_close($process);
 
   $error = (!empty($stderr) || $return_value != 0);
-  logging(
+  Log :: log(
     ($error?'ERROR':'DEBUG'),
     "External command ".($error?"error":"result").":\n".
     "\tCommand : $command\n".
diff --git a/includes/hooks.php b/includes/hooks.php
index 1ac062c..26ed509 100644
--- a/includes/hooks.php
+++ b/includes/hooks.php
@@ -1,5 +1,7 @@
 <?php
 
+use EesyPHP\Log;
+
 $hooks = array();
 
 /**
@@ -44,22 +46,21 @@ function trigger_hook($event_name, $event_data=null) {
           call_user_func_array($e['callable'],array($event, &$e['param']));
         }
         catch(Exception $e) {
-          log_exception(
+          Log :: exception(
             $e, "An exception occured running hook ".format_callable($e['callable']).
             " on event $event_name");
           $return = false;
         }
       }
       else {
-        logging(
-          'ERROR',
+        Log :: error(
           "The hook ".format_callable($e['callable'])." on event $event_name is not callable.");
         $return = false;
       }
     }
   }
   else
-    logging('DEBUG', "No hook registered for event $event_name.");
+    Log :: debug("No hook registered for event $event_name.");
 
   // Handle 'all' event
   if ($event_name != 'all') {
diff --git a/includes/logging.php b/includes/logging.php
deleted file mode 100644
index a99c4a4..0000000
--- a/includes/logging.php
+++ /dev/null
@@ -1,256 +0,0 @@
-<?php
-
-/*
- * Configuration :
- * // Log file
- * $log_file='/path/to/app.log';
- *
- * // Log level (DEBUG / INFO / WARNING / ERROR / FATAL)
- * $log_level='INFO';
- *
- * // Log PHP errors levels (as specified to set_error_handler())
- * // $log_php_errors_levels = E_ALL & ~E_STRICT;
-
- * // Log PHP errors levels (as specified to set_error_handler())
- * // Default:
- * // - In TRACE or DEBUG: E_ALL & ~E_STRICT
- * // - Otherwise: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
- * // $log_php_errors_levels = E_ALL & ~E_STRICT;
- */
-
-
-// Log file descriptor (Do not change !!!)
-$_log_file_fd = null;
-
-// Log Levels
-$_log_levels = array(
-  'TRACE' => 0,
-  'DEBUG' => 1,
-  'INFO' => 2,
-  'WARNING' => 3,
-  'ERROR' => 4,
-  'FATAL' => 5,
-);
-
-// Custom fatal error handler
-$_fatal_error_handler = null;
-
-/**
- * Log a message
- * @param string $level The message level (key of $_log_levels)
- * @param string $message The message to log
- * @return true
- */
-function logging($level, $message) {
-  global $log_file, $_log_file_fd, $_log_levels, $log_level, $argv,
-  $_fatal_error_handler, $auth_user;
-
-  if (!array_key_exists($level, $_log_levels)) $level = 'INFO';
-  $level_id = $_log_levels[$level];
-
-  $log_level_id = $_log_levels[$log_level];
-
-  if ($level_id < $log_level_id) return true;
-  if(is_null($_log_file_fd)) {
-    $_log_file_fd = fopen($log_file, 'a');
-  }
-
-  // If more than 2 arguments passed, format message using sprintf
-  if (func_num_args() > 2) {
-    $message = call_user_func_array(
-      'sprintf',
-      array_merge(array($message), array_slice(func_get_args(), 2))
-    );
-  }
-
-  if (php_sapi_name() == "cli") {
-    $msg = implode(' - ', array(
-      date('Y/m/d H:i:s'),
-      basename($argv[0]),
-      $level,
-      $message
-    ))."\n";
-  }
-  else {
-    $msg = array(
-      date('Y/m/d H:i:s'),
-      $_SERVER['REQUEST_URI'],
-      $_SERVER['REMOTE_ADDR'],
-    );
-    if (isset($auth_user))
-      $msg[] = ($auth_user['username']?$auth_user['username']:'anonymous');
-    $msg[] = $level;
-    $msg[] = $message;
-    $msg = implode(' - ', $msg)."\n";
-  }
-
-  fwrite($_log_file_fd, $msg);
-
-  if ($level == 'FATAL')
-    if (!is_null($_fatal_error_handler))
-      call_user_func($_fatal_error_handler, $message);
-    elseif (function_exists('fatal_error'))
-      fatal_error($message);
-    else
-      die("\n$message\n\n");
-  elseif (php_sapi_name() == "cli")
-    echo $msg;
-
-  return true;
-}
-
-// Set default log level (if not defined or invalid)
-$default_log_level = 'WARNING';
-if (!isset($log_level)) {
-  $log_level = $default_log_level;
-}
-elseif (!array_key_exists($log_level, $_log_levels)) {
-  $invalid_value = $log_level;
-  $log_level = $default_log_level;
-  logging(
-    $log_level, "Invalid log level value found in configuration (%s). ".
-    "Set as default (%s).", $invalid_value, $log_level);
-}
-
-/**
- * Register a contextual fatal error handler
- * @param null|callable $handler The fatal error handler (set as null to reset)
- * @return void
- */
-function register_fatal_error_handler($handler) {
-  // @phpstan-ignore-next-line
-  if ($handler && !is_callable($handler))
-    logging('FATAL', 'Fatal handler provided is not callable !');
-  global $_fatal_error_handler;
-  $_fatal_error_handler = ($handler?$handler:null);
-}
-
-
-/**
- * Change of current log file
- * @param string $file The new log file path
- * @return bool
- */
-function change_log_file($file) {
-  global $log_file, $_log_file_fd;
-  if ($file == $log_file) return True;
-  if ($_log_file_fd) {
-    fclose($_log_file_fd);
-    $_log_file_fd = false;
-  }
-  $log_file = $file;
-  return True;
-}
-
-/*
- *******************************************************************************
- *            Handle exception logging
- *******************************************************************************
- */
-
-/**
- * Get the current backtrace
- * @param int $ignore_last The number of last levels to ignore
- * @return string
- */
-function get_debug_backtrace_context($ignore_last=0) {
-  $traces = debug_backtrace();
-
-  // Also ignore this function it self
-  $ignore_last++;
-
-  if (!is_array($traces) || count($traces) <= $ignore_last)
-    return "";
-
-  $msg = array();
-  for ($i=$ignore_last; $i < count($traces); $i++) {
-    $trace = array("#$i");
-    if (isset($traces[$i]['file']))
-      $trace[] = $traces[$i]['file'].(isset($traces[$i]['line'])?":".$traces[$i]['line']:"");
-    // @phpstan-ignore-next-line
-    if (isset($traces[$i]['class']) && isset($traces[$i]['function']))
-      $trace[] = implode(" ", array(
-        $traces[$i]['class'],
-        $traces[$i]['type'],
-        $traces[$i]['function']. "()"));
-    elseif (isset($traces[$i]['function']))
-      $trace[] = $traces[$i]['function']. "()";
-    $msg[] = implode(" - ", $trace);
-  }
-
-  return implode("\n", $msg);
-}
-
-/**
- * Log an exception
- * @param Throwable $exception
- * @param string|null $prefix The prefix of the log message
- *          (optional, default: "An exception occured")
- * @return void
- */
-function log_exception($exception, $prefix=null) {
-  if (function_exists('log_in_sentry'))
-    log_in_sentry($exception);
-  // If more than 2 arguments passed, format prefix message using sprintf
-  if ($prefix && func_num_args() > 2) {
-    $prefix = call_user_func_array(
-      'sprintf',
-      array_merge(array($prefix), array_slice(func_get_args(), 2))
-    );
-  }
-  logging(
-    "ERROR", "%s:\n%s\n## %s:%d : %s",
-    ($prefix?$prefix:"An exception occured"),
-    get_debug_backtrace_context(1),
-    $exception->getFile(), $exception->getLine(),
-    $exception->getMessage());
-}
-set_exception_handler('log_exception');
-
-/*
- *******************************************************************************
- *            Handle PHP error logging
- *******************************************************************************
- */
-
-/**
- * Convert PHP error number to the corresponding label
- * @param int $errno
- * @return string
- */
-function errno2type($errno) {
-  $constants = get_defined_constants();
-  if (is_array($constants))
-    foreach($constants as $label => $value)
-      if ($value == $errno && preg_match('/^E_(.*)$/', $label, $m))
-        return $m[1];
-  return 'UNKNOWN ERROR #'.$errno;
-}
-
-/**
- * Log a PHP error
- * Note: method design to be used as callable by set_error_handler()
- * @param int $errno The error number
- * @param string $errstr The error message
- * @param string $errfile The filename that the error was raised in
- * @param int $errline The line number where the error was raised
- * @return false Return false to let the normal error handler continues.
- */
-function log_php_error($errno, $errstr, $errfile, $errline) {
-  $msg = sprintf(
-    "A PHP error occured : [%s] %s\nFile : %s (line : %d)",
-    errno2type($errno), $errstr, $errfile, $errline
-  );
-  logging("ERROR", $msg);
-  if (function_exists('log_php_error_in_sentry'))
-    log_php_error_in_sentry($errno, $msg);
-  return False;
-}
-if (isset($log_php_errors_levels))
-  set_error_handler('log_php_error', $log_php_errors_levels);
-elseif (in_array($log_level, array('DEBUG', 'TRACE')))
-  set_error_handler('log_php_error', E_ALL & ~E_STRICT);
-else
-  set_error_handler('log_php_error', E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED);
-
-# vim: tabstop=2 shiftwidth=2 softtabstop=2 expandtab
diff --git a/includes/mail.php b/includes/mail.php
index fd6c405..ebced4b 100644
--- a/includes/mail.php
+++ b/includes/mail.php
@@ -1,5 +1,7 @@
 <?php
 
+use EesyPHP\Log;
+
 // Load PHP PEAR Mail and Mail_mime libs
 require_once(isset($php_mail_path)?$php_mail_path:"Mail.php");
 require_once(isset($php_mail_mime_path)?$php_mail_mime_path:"Mail/mime.php");
@@ -30,14 +32,14 @@ function send_mail($from, $to, $subject, $msg, $html=false, $attachments=null, $
     $headers = array_merge($headers, $mail_headers);
   }
 
-  logging(
-    'TRACE', 'Mail catch all: %s',
+  Log :: trace(
+    'Mail catch all: %s',
       isset($mail_catch_all) && $mail_catch_all?
       vardump($mail_catch_all):'not set'
   );
   if (isset($mail_catch_all) && $mail_catch_all) {
-    logging(
-      'DEBUG', 'Mail catch to %s',
+    Log :: debug(
+      'Mail catch to %s',
       is_array($mail_catch_all)?implode(',', $mail_catch_all):$mail_catch_all
     );
     $msg .= sprintf(
@@ -76,7 +78,7 @@ function send_mail($from, $to, $subject, $msg, $html=false, $attachments=null, $
   foreach(array_keys($headers) as $header) {
     if(in_array(strtoupper($header), array('BCC', 'CC'))) {
       if (isset($mail_catch_all) && $mail_catch_all) {
-        logging('DEBUG', "Mail catched: remove $header header");
+        Log :: debug("Mail catched: remove $header header");
         $msg .= sprintf(
           (
             $html?
@@ -126,7 +128,7 @@ function send_mail($from, $to, $subject, $msg, $html=false, $attachments=null, $
 
   if (PEAR::isError($ret)) {
     $msg = "Error sending email: ".$ret -> getMessage();
-    logging('ERROR', $msg);
+    Log :: error($msg);
     return false;
   }
   return true;
diff --git a/includes/sentry.php b/includes/sentry.php
index b0c3fc6..08df89f 100644
--- a/includes/sentry.php
+++ b/includes/sentry.php
@@ -1,5 +1,7 @@
 <?php
 
+use EesyPHP\Log;
+
 /*
  * Configuration :
  *
@@ -17,7 +19,7 @@ if (isset($sentry_dsn) && $sentry_dsn) {
     \Sentry\init([
         'dsn' => $sentry_dsn,
         'traces_sample_rate' => (
-            isset($sentry_traces_sample_rate) ? 
+            isset($sentry_traces_sample_rate) ?
             $sentry_traces_sample_rate : 0.2
         ),
     ]);
@@ -35,21 +37,21 @@ if (isset($sentry_dsn) && $sentry_dsn) {
 
 /**
  * Log an exception or a message in Sentry
- * @param string|Exception $msg
+ * @param string|Throwable $msg
  * @return void
  */
 function log_in_sentry($msg) {
     global $sentry_dsn;
     if (!isset($sentry_dsn) || !$sentry_dsn) {
-        logging('TRACE', 'Sentry DSN not configured, do not log this error');
+        Log :: trace('Sentry DSN not configured, do not log this error');
         return;
     }
     if (is_string($msg)) {
-        logging('DEBUG', 'Error logged in Sentry');
+        Log :: debug('Error logged in Sentry');
         \Sentry\captureMessage($msg);
     }
     elseif ($msg instanceof Exception) {
-        logging('DEBUG', 'Exception logged in Sentry');
+        Log :: debug('Exception logged in Sentry');
         \Sentry\captureException($msg);
     }
 }
diff --git a/includes/session.php b/includes/session.php
index 8a1812e..4c359e1 100644
--- a/includes/session.php
+++ b/includes/session.php
@@ -1,4 +1,7 @@
 <?php
+
+use EesyPHP\Log;
+
 if (php_sapi_name() == "cli")
   return true;
 
@@ -19,18 +22,17 @@ if (!isset($_SESSION['session_key'])) {
 // Handle session timeout
 if (isset($session_timeout) && $session_timeout) {
   if (!isset($_SESSION['session_last_access'])) {
-    logging('DEBUG', 'Set initial session last access');
+    Log :: debug('Set initial session last access');
     $_SESSION['session_last_access'] = time();
   }
   elseif ($_SESSION['session_last_access'] > (time() - $session_timeout)) {
-    logging(
-      'DEBUG',
+    Log :: debug(
       'Session timeout not expired, update session last access '.
       '(Previous value : '.$_SESSION['session_last_access'].')');
     $_SESSION['session_last_access'] = time();
   }
   else {
-    logging('INFO', 'Session destroyed due to inactivity');
+    Log :: info('Session destroyed due to inactivity');
     session_destroy();
   }
 }
diff --git a/includes/smarty.php b/includes/smarty.php
index fc37919..7a97fcd 100644
--- a/includes/smarty.php
+++ b/includes/smarty.php
@@ -1,5 +1,7 @@
 <?php
 
+use EesyPHP\Log;
+
 if (php_sapi_name() == "cli")
   return true;
 
@@ -57,7 +59,7 @@ elseif (method_exists($smarty,'registerPlugin')) {
   }
 }
 else {
-  logging('FATAL', _('Smarty version not supported.'));
+  Log :: fatal(_('Smarty version not supported.'));
 }
 
 // Configure templates/templates_c directories
@@ -65,8 +67,8 @@ if (
     !isset($smarty_templates_dir)
     || !is_dir($smarty_templates_dir)
 )
-    logging(
-        'FATAL', "Template directory not found (%s)",
+    Log :: fatal(
+        "Template directory not found (%s)",
         isset($smarty_templates_dir)?$smarty_templates_dir:'not set');
 else
     $smarty->setTemplateDir($smarty_templates_dir);
@@ -76,8 +78,8 @@ if (
     || !is_dir($smarty_templates_c_dir)
     || !is_writable($smarty_templates_c_dir)
 )
-    logging(
-        'FATAL', "Template cache directory not found or not writable (%s)",
+    Log :: fatal(
+        "Template cache directory not found or not writable (%s)",
         isset($smarty_templates_c_dir)?$smarty_templates_c_dir:'not set');
 else
     $smarty->setCompileDir($smarty_templates_c_dir);
@@ -179,7 +181,7 @@ function _defineCommonTemplateVariables($template, $pagetitle) {
 
 function display_template($template, $pagetitle=false) {
   if (!$template)
-    logging("FATAL", _("No template specified."));
+    Log :: fatal(_("No template specified."));
 
   // If refresh parameter is present, remove it and redirect
   if (isset($_GET['refresh'])) {
@@ -208,9 +210,9 @@ function display_template($template, $pagetitle=false) {
     unset($_SESSION['messages']);
   }
   catch (Exception $e) {
-    log_exception($e, "Smarty - An exception occured displaying template '$template'");
+    Log :: exception($e, "Smarty - An exception occured displaying template '$template'");
     if ($template != 'fatal_error.tpl')
-      logging("FATAL", _("An error occurred while displaying this page."));
+      Log :: fatal(_("An error occurred while displaying this page."));
   }
 
   $sentry_span->finish();
@@ -234,7 +236,7 @@ function display_ajax_return($data=null, $pretty=false) {
     unset($_SESSION['errors']);
   }
   if ($debug_ajax)
-    logging('DEBUG',"Ajax Response : ".vardump($data));
+    Log :: debug("Ajax Response : ".vardump($data));
   header('Content-Type: application/json');
   echo json_encode($data, (($pretty||isset($_REQUEST['pretty']))?JSON_PRETTY_PRINT:0));
   exit();
diff --git a/includes/translation-cli.php b/includes/translation-cli.php
index 796b09b..b9f2daf 100644
--- a/includes/translation-cli.php
+++ b/includes/translation-cli.php
@@ -1,5 +1,7 @@
 <?php
 
+use EesyPHP\Log;
+
 /*
  ********************************************************************
  *                   Translations CLI commands                      *
@@ -56,7 +58,7 @@ function cli_extract_messages($command_args) {
     false   // do not escape command args (already done)
   );
   if (!is_array($php_files) || $php_files[0] != 0) {
-    logging('FATAL', _("Fail to list PHP files."));
+    Log :: fatal(_("Fail to list PHP files."));
   }
 
   // Extract messages from PHP files using xgettext
@@ -73,7 +75,7 @@ function cli_extract_messages($command_args) {
     $php_files[1]                               // Pass PHP files list via STDIN
   );
   if (!is_array($result) || $result[0] != 0)
-    logging('FATAL', _("Fail to extract messages from PHP files using xgettext."));
+    Log :: fatal(_("Fail to extract messages from PHP files using xgettext."));
 
 
   // List JS files to parse
@@ -83,7 +85,7 @@ function cli_extract_messages($command_args) {
     false   // do not escape command args (already done)
   );
   if (!is_array($js_files) || $js_files[0] != 0) {
-    logging('FATAL', _("Fail to list JS files."));
+    Log :: fatal(_("Fail to list JS files."));
   }
 
   // Extract messages from JS files using xgettext
@@ -100,7 +102,7 @@ function cli_extract_messages($command_args) {
     $js_files[1]                              // Pass JS files list via STDIN
   );
   if (!is_array($result) || $result[0] != 0)
-    logging('FATAL', _("Fail to extract messages from JS files using xgettext."));
+    Log :: fatal(_("Fail to extract messages from JS files using xgettext."));
 
   // Extract messages from templates files using tsmarty2c.php
   $result = run_external_command(
@@ -111,8 +113,7 @@ function cli_extract_messages($command_args) {
     )
   );
   if (!is_array($result) || $result[0] != 0)
-    logging(
-      'FATAL',
+    Log :: fatal(
       _("Fail to extract messages from template files using tsmarty2c.php script."));
 
   $fd = fopen("$root_lang_dir/headers.pot", 'w');
@@ -139,7 +140,7 @@ function cli_extract_messages($command_args) {
     "-o", "$root_lang_dir/messages.pot",
   ));
   if (!is_array($result) || $result[0] != 0)
-    logging('FATAL', _("Fail to merge messages using msgcat."));
+    Log :: fatal(_("Fail to merge messages using msgcat."));
 }
 add_cli_command(
   'extract_messages',
@@ -162,14 +163,14 @@ function cli_update_messages($command_args) {
   $compendium_args = array();
   foreach ($command_args as $path) {
     if (!file_exists($path))
-      logging('FATAL', _("Compendium file %s not found."), $path);
+      Log :: fatal(_("Compendium file %s not found."), $path);
     $compendium_args[] = '-C';
     $compendium_args[] = $path;
   }
 
   $pot_file = "$root_lang_dir/messages.pot";
   if (!is_file($pot_file))
-    logging('FATAL', _("POT file not found (%s). Please run extract_messages first."), $pot_file);
+    Log :: fatal(_("POT file not found (%s). Please run extract_messages first."), $pot_file);
 
   if ($dh = opendir($root_lang_dir)) {
     $error = False;
@@ -181,13 +182,13 @@ function cli_update_messages($command_args) {
       )
         continue;
 
-      logging('DEBUG', _("Lang directory '%s' found"), $file);
+      Log :: debug(_("Lang directory '%s' found"), $file);
 
       // Check LC_MESSAGES directory exists
       $lang = $file;
       $lang_dir = $root_lang_dir . '/' . $file . '/LC_MESSAGES' ;
       if (!is_dir($lang_dir)) {
-        logging('DEBUG', _("LC_MESSAGES directory not found in lang '%s' directory, ignore it."),
+        Log :: debug(_("LC_MESSAGES directory not found in lang '%s' directory, ignore it."),
           $lang);
         continue;
       }
@@ -202,7 +203,7 @@ function cli_update_messages($command_args) {
         if (is_array($result) && $result[0] == 0) {
           $created = true;
         } else {
-          logging('ERROR', _("Fail to init messages in %s PO file using msginit (%s)."),
+          Log :: error(_("Fail to init messages in %s PO file using msginit (%s)."),
             $lang, $po_file);
           $error = True;
         }
@@ -220,20 +221,20 @@ function cli_update_messages($command_args) {
           )
         );
         if (!is_array($result) || $result[0] != 0) {
-          logging('ERROR', _("Fail to update messages in %s PO file using msgmerge (%s)."),
+          Log :: error(_("Fail to update messages in %s PO file using msgmerge (%s)."),
             $lang, $po_file);
           $error = True;
         }
       }
       elseif (!$created) {
-        logging('DEBUG', _("PO file not found in lang '%s' directory, ignore it."), $lang);
+        Log :: debug(_("PO file not found in lang '%s' directory, ignore it."), $lang);
       }
     }
     closedir($dh);
     return !$error;
   }
 
-  logging('FATAL', _("Fail to open root lang directory (%s)."), $root_dir_path);
+  Log :: fatal(_("Fail to open root lang directory (%s)."), $root_dir_path);
   return false;
 }
 add_cli_command(
@@ -268,29 +269,28 @@ function cli_compile_messages($command_args) {
         if (dirname($real_lang_dir) != '.' || !is_dir($root_lang_dir . '/' . $real_lang_dir))
           continue;
         $lang = $file;
-        logging('DEBUG', _("Lang alias symlink found: %s -> %s"), $lang, $real_lang_dir);
+        Log :: debug(_("Lang alias symlink found: %s -> %s"), $lang, $real_lang_dir);
 
         // Create JSON catalog symlink (if not exists)
         $js_link = "$root_dir_path/public_html/translations/$lang.js";
         $link_target = "$real_lang_dir.js";
         if (!file_exists($js_link)) {
           if (symlink($link_target, $js_link)) {
-            logging('INFO', _("JSON catalog symlink for %s -> %s created (%s)"),
+            Log :: info(_("JSON catalog symlink for %s -> %s created (%s)"),
               $lang, $real_lang_dir, $js_link);
           }
           else {
-            logging('ERROR', _("Fail to create JSON catalog symlink for %s -> %s (%s)"),
+            Log :: error(_("Fail to create JSON catalog symlink for %s -> %s (%s)"),
               $lang, $real_lang_dir, $js_link);
             $error = True;
           }
         }
         elseif (readlink($js_link) == $link_target) {
-          logging('DEBUG', _("JSON catalog symlink for %s -> %s already exist (%s)"),
+          Log :: debug(_("JSON catalog symlink for %s -> %s already exist (%s)"),
             $lang, $real_lang_dir, $js_link);
         }
         else {
-          logging(
-            'WARNING',
+          Log :: warning(
             _("JSON catalog file for %s already exist, but it's not a symlink to %s (%s)"),
             $lang, $real_lang_dir, $js_link
           );
@@ -299,13 +299,13 @@ function cli_compile_messages($command_args) {
         continue;
       }
 
-      logging('DEBUG', _("Lang directory '%s' found"), $file);
+      Log :: debug(_("Lang directory '%s' found"), $file);
 
       // Check LC_MESSAGES directory exists
       $lang = $file;
       $lang_dir = $root_lang_dir . '/' . $file . '/LC_MESSAGES' ;
       if (!is_dir($lang_dir)) {
-        logging('DEBUG', _("LC_MESSAGES directory not found in lang '%s' directory, ignore it."),
+        Log :: debug(_("LC_MESSAGES directory not found in lang '%s' directory, ignore it."),
           $lang);
         continue;
       }
@@ -313,7 +313,7 @@ function cli_compile_messages($command_args) {
       // Test .PO file is present
       $po_file = $lang_dir . '/' . TEXT_DOMAIN . '.po';
       if (!is_file($po_file)) {
-        logging('DEBUG', _("PO file not found in lang '%s' directory, ignore it."),
+        Log :: debug(_("PO file not found in lang '%s' directory, ignore it."),
           $lang);
         continue;
       }
@@ -325,8 +325,7 @@ function cli_compile_messages($command_args) {
         array("msgfmt", "-o", $mo_file, $po_file)
       );
       if (!is_array($result) || $result[0] != 0) {
-        logging(
-          'ERROR',
+        Log :: error(
           _("Fail to compile messages from %s PO file as MO file using msgfmt (%s)."),
           $lang, $po_file
         );
@@ -337,24 +336,24 @@ function cli_compile_messages($command_args) {
       $json_catalog = po2json($lang, $po_file);
       $js_file = "$root_dir_path/public_html/translations/$lang.js";
       if(!$fd = fopen($js_file, 'w')) {
-        logging('ERROR', _("Fail to open %s JSON catalog file in write mode (%s)."),
+        Log :: error(_("Fail to open %s JSON catalog file in write mode (%s)."),
           $lang, $js_file);
         $error = True;
       }
       elseif (fwrite($fd, sprintf("translations_data = %s;", $json_catalog)) === false) {
-        logging('ERROR', _("Fail to write %s JSON catalog in file (%s)."),
+        Log :: error(_("Fail to write %s JSON catalog in file (%s)."),
           $lang, $js_file);
         $error = True;
       }
       else {
-        logging('INFO', _("%s JSON catalog writed (%s)."), $lang, $js_file);
+        Log :: info(_("%s JSON catalog writed (%s)."), $lang, $js_file);
       }
     }
     closedir($dh);
 
     return !$error;
   }
-  logging('FATAL', _("Fail to open root lang directory (%s)."), $root_dir_path);
+  Log :: fatal(_("Fail to open root lang directory (%s)."), $root_dir_path);
   return false;
 }
 add_cli_command(
diff --git a/includes/translation.php b/includes/translation.php
index 93043d9..1f4d381 100644
--- a/includes/translation.php
+++ b/includes/translation.php
@@ -1,5 +1,7 @@
 <?php
 
+use EesyPHP\Log;
+
 // Gettext text domain
 define('TEXT_DOMAIN', 'DEFAULT');
 
@@ -14,7 +16,7 @@ define('TEXT_DOMAIN', 'DEFAULT');
 function get_available_langs($as_locales=false) {
   global $root_lang_dir;
   if (!is_dir($root_lang_dir))
-    logging('FATAL', "Root land directory not found ($root_lang_dir)");
+    Log :: fatal("Root land directory not found ($root_lang_dir)");
   $langs = array(($as_locales?'en_US.UTF8':'en'));
   if ($dh = opendir($root_lang_dir)) {
     while (($file = readdir($dh)) !== false) {
@@ -31,7 +33,7 @@ function get_available_langs($as_locales=false) {
     closedir($dh);
   }
   $langs = array_unique($langs);
-  logging('TRACE', 'Available '.($as_locales?'locales':'languages').': '.implode(', ', $langs));
+  Log :: trace('Available '.($as_locales?'locales':'languages').': '.implode(', ', $langs));
   return $langs;
 }
 
@@ -80,7 +82,7 @@ function init_translation() {
   $root_lang_dir = "$root_dir_path/lang";
 
   if (!class_exists('Locale')) {
-    logging('ERROR', 'Locale PHP class does not exist. May be php-intl is not installed?');
+    Log :: error('Locale PHP class does not exist. May be php-intl is not installed?');
     return;
   }
 
@@ -88,11 +90,11 @@ function init_translation() {
   if (php_sapi_name() != "cli") {
     if (isset($_REQUEST['lang']) && in_array($_REQUEST['lang'], $available_langs)) {
       $lang = $_REQUEST['lang'];
-      logging('TRACE', "Select lang from request parameter: '$lang'");
+      Log :: trace("Select lang from request parameter: '$lang'");
     }
     elseif (isset($_SESSION['lang']) && in_array($_SESSION['lang'], $available_langs) && !isset($_REQUEST['reset_lang'])) {
       $lang = $_SESSION['lang'];
-      logging('TRACE', "Restore lang from session: '$lang'");
+      Log :: trace("Restore lang from session: '$lang'");
     }
     else {
       $lang = Locale::lookup(
@@ -101,7 +103,7 @@ function init_translation() {
         true,
         Locale::getPrimaryLanguage($default_locale)
       );
-      logging('TRACE', "Best lang found is '$lang'");
+      Log :: trace("Best lang found is '$lang'");
     }
   }
   else {
@@ -112,32 +114,32 @@ function init_translation() {
     if ($sys_current)
       $lang = Locale::getPrimaryLanguage($sys_current);
     if (is_null($lang)) {
-      logging('TRACE', 'No configured lang detected from CLI env, use default.');
+      Log :: trace('No configured lang detected from CLI env, use default.');
       $lang = Locale::getPrimaryLanguage($default_locale);
     }
     else
-      logging('TRACE', "Lang detected from CLI env : '$lang'");
+      Log :: trace("Lang detected from CLI env : '$lang'");
   }
 
   // Keep selected lang in session
   $_SESSION['lang'] = $lang;
 
   $locale = lang2locale($lang);
-  logging('TRACE', "Matching locale found with language '$lang' is '$locale'");
+  Log :: trace("Matching locale found with language '$lang' is '$locale'");
 
   // Gettext firstly look the LANGUAGE env variable, so set it
   if (!putenv("LANGUAGE=$locale"))
-    logging('ERROR', "Fail to set LANGUAGE variable in environnement to '$locale'");
+    Log :: error("Fail to set LANGUAGE variable in environnement to '$locale'");
 
   // Set the locale
   if (setlocale(LC_ALL, $locale) === false)
-    logging('ERROR', "An error occured setting locale to '$locale'");
+    Log :: error("An error occured setting locale to '$locale'");
 
   // Configure and set the text domain
   $fullpath = bindtextdomain(TEXT_DOMAIN, $root_lang_dir);
-  logging('TRACE', "Text domain fullpath is '$fullpath'.");
-  logging('TRACE', "Text domain is '".textdomain(TEXT_DOMAIN)."'.");
-  logging('TRACE', "Test: "._('Hello world !'));
+  Log :: trace("Text domain fullpath is '$fullpath'.");
+  Log :: trace("Text domain is '".textdomain(TEXT_DOMAIN)."'.");
+  Log :: trace("Test: "._('Hello world !'));
 
   // JS translation file
   $js_translation_file = "translations/$lang.js";
diff --git a/includes/url-helpers.php b/includes/url-helpers.php
index 0888882..f43ceb7 100644
--- a/includes/url-helpers.php
+++ b/includes/url-helpers.php
@@ -1,14 +1,17 @@
 <?php
 
+use EesyPHP\Check;
+use EesyPHP\Log;
+
 function get_item_from_url($id, $fatal=false) {
-  if (!check_id($id))
-    logging('FATAL', _('Invalid element identifier.'));
+  if (!Check :: id($id))
+    Log :: fatal(_('Invalid element identifier.'));
 
   $item = get_item($id);
   if(!is_array($item)) {
     $error = sprintf(_("Item #% s not found."), $id);
     if ($fatal)
-      logging('FATAL', $error);
+      Log :: fatal($error);
     add_error($error);
     return false;
   }
diff --git a/includes/url-public.php b/includes/url-public.php
index 6e50dba..4a34e07 100644
--- a/includes/url-public.php
+++ b/includes/url-public.php
@@ -1,5 +1,10 @@
 <?php
 
+use EesyPHP\Check;
+use EesyPHP\Log;
+
+use function EesyPHP\vardump;
+
 if (php_sapi_name() == "cli")
   return true;
 
@@ -26,7 +31,7 @@ function handle_search($request) {
     if (isset($_REQUEST['clear']) && $_REQUEST['clear']=='true')
       redirect($request -> current_url);
   }
-  logging('DEBUG', 'Request params : '.vardump($_REQUEST));
+  Log :: debug('Request params : '.vardump($_REQUEST));
 
   $status_list['all'] = _('Any');
   if (isset($_REQUEST['status'])) {
@@ -39,7 +44,7 @@ function handle_search($request) {
   if (isset($_REQUEST['pattern'])) {
     if (trim($_REQUEST['pattern']) == '')
       $_SESSION['search']['pattern'] = false;
-    else if (check_search_pattern($_REQUEST['pattern']))
+    else if (Check :: search_pattern($_REQUEST['pattern']))
       $_SESSION['search']['pattern'] = $_REQUEST['pattern'];
     else
       $smarty -> assign('pattern_error', true);
@@ -82,7 +87,7 @@ function handle_search($request) {
     $_SESSION['search']['nb_by_page']=$nbs_by_page[0];
   }
 
-  logging('DEBUG', 'Search params : '.vardump($_SESSION['search']));
+  Log :: debug('Search params : '.vardump($_SESSION['search']));
   $result = search_items($_SESSION['search']);
   if (!is_array($result))
     fatal_error(
@@ -146,8 +151,8 @@ function handle_create($request) {
       add_error(_("An error occurred while saving this item."));
     }
   }
-  logging('DEBUG', 'Validated data : '.vardump($info));
-  logging('DEBUG', 'Fields errors : '.vardump($field_errors));
+  Log :: debug('Validated data : '.vardump($info));
+  Log :: debug('Fields errors : '.vardump($field_errors));
   if (isset($_POST['submit']) && !empty($field_errors))
     add_error(
       _("There are errors preventing this item from being saved. ".
@@ -178,7 +183,7 @@ function handle_modify($request) {
         if ($value != $item[$key])
           $changes[$key] = $value;
       }
-      logging('DEBUG', 'Changes : '.vardump($changes));
+      Log :: debug('Changes : '.vardump($changes));
       if (empty($changes)) {
         add_message(_("You have not made any changes to element '% s'."), $item['name']);
         redirect('item/'.$item['id']);
@@ -191,8 +196,8 @@ function handle_modify($request) {
         add_error(_("An error occurred while updating this item."));
       }
     }
-    logging('DEBUG', 'Validated data : '.vardump($info));
-    logging('DEBUG', 'Fields errors : '.vardump($field_errors));
+    Log :: debug('Validated data : '.vardump($info));
+    Log :: debug('Fields errors : '.vardump($field_errors));
     $smarty->assign('submited', isset($_POST['submit']));
     if (isset($_POST['submit']) && !empty($field_errors))
       add_error(
diff --git a/includes/url.php b/includes/url.php
index 0dfe1d0..e124be3 100644
--- a/includes/url.php
+++ b/includes/url.php
@@ -1,5 +1,10 @@
 <?php
 
+use EesyPHP\Log;
+
+use function EesyPHP\format_callable;
+use function EesyPHP\vardump;
+
 /*
  * Configured URL patterns :
  *
@@ -67,8 +72,8 @@ function add_url_handler($pattern, $handler=null, $authenticated=null, $override
       );
     }
     elseif ($override) {
-      logging(
-        'DEBUG', "URL : override pattern '%s' with handler '%s' (old handler = '%s')".
+      Log :: debug(
+        "URL : override pattern '%s' with handler '%s' (old handler = '%s')".
         $pattern, format_callable($handler), vardump($url_patterns[$pattern])
       );
       $url_patterns[$pattern] = array(
@@ -79,7 +84,7 @@ function add_url_handler($pattern, $handler=null, $authenticated=null, $override
       );
     }
     else {
-      logging('DEBUG', "URL : pattern '$pattern' already defined : do not override.");
+      Log :: debug("URL : pattern '$pattern' already defined : do not override.");
     }
   }
 }
@@ -161,21 +166,19 @@ function get_request($default_url=null) {
   global $url_patterns, $_404_url_handler;
   $current_url = get_current_url();
   if ($current_url === false) {
-    logging(
-      'FATAL',
+    Log :: fatal(
       _('Unable to determine the requested page. '.
       'If the problem persists, please contact support.')
     );
     exit();
   }
   if (!is_array($url_patterns)) {
-    logging('FATAL', 'URL : No URL patterns configured !');
+    Log :: fatal('URL : No URL patterns configured !');
     exit();
   }
 
-  logging('DEBUG', "URL : current url = '$current_url'");
-  logging(
-    'TRACE',
+  Log :: debug("URL : current url = '$current_url'");
+  Log :: trace(
     "URL : check current url with the following URL patterns :\n - ".
     implode("\n - ", array_keys($url_patterns))
   );
@@ -186,19 +189,18 @@ function get_request($default_url=null) {
       // Reset last redirect
       if (isset($_SESSION['last_redirect']))
         unset($_SESSION['last_redirect']);
-      logging('TRACE', "URL : result :\n".vardump($request));
+      Log :: trace("URL : result :\n".vardump($request));
       return $request;
     }
   }
   if ($default_url !== false) {
-    logging('DEBUG', "Current url match with no pattern. Redirect to default url ('$default_url')");
+    Log :: debug("Current url match with no pattern. Redirect to default url ('$default_url')");
     redirect($default_url);
     exit();
   }
   // Error 404
   $api_mode = (strpos($current_url, 'api/') === 0);
-  logging(
-    'DEBUG',
+  Log :: debug(
     "Current URL match with no pattern. Use error 404 handler (API mode=$api_mode).");
   return new UrlRequest(
     $current_url,
@@ -227,8 +229,7 @@ function url_match($pattern, $current_url=false, $methods=null) {
     if (!$current_url) return False;
   }
   if (preg_match($pattern, $current_url, $m)) {
-    logging(
-      'DEBUG',
+    Log :: debug(
       "URL : Match found with pattern '$pattern' :\n\t".
       str_replace("\n", "\n\t", print_r($m, true)));
     return $m;
@@ -242,17 +243,16 @@ function url_match($pattern, $current_url=false, $methods=null) {
  * @return string|false The current request URL or false if fail
  **/
 function get_current_url() {
-  logging('TRACE', "URL : request URI = '".$_SERVER['REQUEST_URI']."'");
+  Log :: trace("URL : request URI = '".$_SERVER['REQUEST_URI']."'");
 
   $base = get_rewrite_base();
-  logging('TRACE', "URL : rewrite base = '$base'");
+  Log :: trace("URL : rewrite base = '$base'");
 
   if ($_SERVER['REQUEST_URI'] == $base)
     return '';
 
   if (substr($_SERVER['REQUEST_URI'], 0, strlen($base)) != $base) {
-    logging(
-      'ERROR',
+    Log :: error(
       "URL : request URI (".$_SERVER['REQUEST_URI'].") does not start with rewrite base ($base)");
     return False;
   }
@@ -323,14 +323,13 @@ function redirect($go=false) {
 
   // Prevent loop
   if (isset($_SESSION['last_redirect']) && $_SESSION['last_redirect'] == $url)
-    logging(
-      'FATAL',
+    Log :: fatal(
       _('Unable to determine the requested page (loop detected). '.
       'If the problem persists, please contact support.'));
   else
     $_SESSION['last_redirect'] = $url;
 
-  logging('DEBUG',"redirect($go) => Redirect to : <$url>");
+  Log :: debug("redirect($go) => Redirect to : <$url>");
   header("Location: $url");
   exit();
 }
@@ -355,10 +354,10 @@ function handle_request($default_url=null) {
   $request = get_request($default_url);
 
   if (!is_callable($request -> handler)) {
-    logging(
-      'ERROR', "URL handler function %s does not exists !",
+    Log :: error(
+      "URL handler function %s does not exists !",
       format_callable($request -> handler));
-    logging('FATAL', _("This request cannot be processed."));
+    Log :: fatal(_("This request cannot be processed."));
   }
 
   if ($request -> api_mode)
@@ -371,15 +370,15 @@ function handle_request($default_url=null) {
     if (function_exists('force_authentication'))
       force_authentication();
     else
-      logging('FATAL', _("Authentication required but force_authentication function is not defined."));
+      Log :: fatal(_("Authentication required but force_authentication function is not defined."));
 
   try {
     call_user_func($request -> handler, $request);
   }
   catch (Exception $e) {
-    log_exception(
+    Log :: exception(
       $e, "An exception occured running URL handler function ".$request -> handler."()");
-    logging('FATAL', _("This request could not be processed correctly."));
+    Log :: fatal(_("This request could not be processed correctly."));
   }
   $sentry_span->finish();
 }
@@ -417,7 +416,7 @@ function check_ajax_request($session_key=null) {
     fatal_error('Invalid request');
 
   if ($debug_ajax)
-    logging('DEBUG',"Ajax Request : ".vardump($_REQUEST));
+    Log :: debug("Ajax Request : ".vardump($_REQUEST));
 }
 
 /**
@@ -432,22 +431,20 @@ function get_absolute_url($relative_url=null) {
   if (!is_string($relative_url))
       $relative_url = get_current_url();
   if ($public_root_url[0] == '/') {
-      logging(
-        'DEBUG',
+      Log :: debug(
         "URL :: get_absolute_url($relative_url): configured public root URL is relative ".
         "($public_root_url) => try to detect it from current request infos.");
       $public_root_url = (
         'http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on'?'s':'').'://'.
         $_SERVER['HTTP_HOST'].$public_root_url);
-      logging(
-        'DEBUG',
+      Log :: debug(
         "URL :: get_absolute_url($relative_url): detected public_root_url: $public_root_url");
   }
 
   if (substr($relative_url, 0, 1) == '/')
     $relative_url = substr($relative_url, 1);
   $url = remove_trailing_slash($public_root_url)."/$relative_url";
-  logging('DEBUG', "URL :: get_absolute_url($relative_url): result = $url");
+  Log :: debug("URL :: get_absolute_url($relative_url): result = $url");
   return $url;
 }
 
@@ -539,7 +536,9 @@ class UrlRequest {
       return urldecode($this->url_params[$key]);
     }
     // Unknown key, log warning
-    logging('WARNING', "__get($key): invalid property requested\n".get_debug_backtrace_context());
+    Log :: warning(
+      "__get($key): invalid property requested\n%s",
+      Log :: get_debug_backtrace_context());
   }
 
   /**
diff --git a/phpstan.neon b/phpstan.neon
index dc7379c..5f76736 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,6 +1,7 @@
 parameters:
     level: 5
     paths:
+        - src
         - includes
         - public_html
         - bin
diff --git a/src/Check.php b/src/Check.php
new file mode 100644
index 0000000..73374c8
--- /dev/null
+++ b/src/Check.php
@@ -0,0 +1,97 @@
+<?php
+
+namespace EesyPHP;
+
+class Check {
+  public static function name($name) {
+    if (preg_match('/^[\w \-]{2,}$/iu',$name))
+      return true;
+    return false;
+  }
+
+  public static function id(&$id) {
+    if (is_int($id))
+      return true;
+    if (preg_match('/^[0-9]+$/', $id)) {
+      $id = intval($id);
+      return true;
+    }
+    return false;
+  }
+
+  public static function search_pattern($pattern) {
+    foreach(preg_split('/\s+/', trim($pattern)) as $word) {
+      if (!self :: id($word) && !self :: name($word))
+        return false;
+    }
+    return true;
+  }
+
+  public static function time(&$time) {
+    if (!is_int($time)) {
+      if (preg_match('/^[0-9]+$/', $time))
+        $time = intval($time);
+      else
+        return false;
+    }
+    return ($time >= 1577833200);  // 2020-01-01 - date of birth of this soft
+  }
+
+  public static function description($comment) {
+    if (preg_match("/^[\p{L}0-9\p{P}\p{Zs}\p{Zl}\p{Sc}\=\+]+$/uim", $comment))
+      return true;
+    return false;
+  }
+
+  public static function email($value, $domain=NULL, $checkDns=true) {
+    $regex = '/^((\"[^\"\f\n\r\t\v\b]+\")|([\w\!\#\$\%\&\'\*\+\-\~\/\^\`\|\{\}]+(\.[\w\!\#\$\%\&\'\*\+\-\~\/\^\`\|\{\}]+)*))@((\[(((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9])))\])|(((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9])))|((([A-Za-z0-9\-])+\.)+[A-Za-z\-]+))$/';
+
+    if (!preg_match($regex, $value)) {
+      return false;
+    }
+
+    $nd = explode('@', $value);
+    $nd=$nd[1];
+
+    if ($domain) {
+      if(is_array($domain)) {
+        if (!in_array($nd,$domain)) {
+          return false;
+        }
+      }
+      else {
+        if($nd!=$domain) {
+          return false;
+        }
+      }
+    }
+
+    if ($checkDns && function_exists('checkdnsrr')) {
+      if (!(checkdnsrr($nd, 'MX') || checkdnsrr($nd, 'A'))) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  public static function is_empty($val) {
+    switch(gettype($val)) {
+      case "boolean":
+      case "integer":
+      case "double":
+      case "object":
+      case "resource":
+        return False;
+      case "array":
+      case "string":
+        if ($val == "0") return false;
+        return empty($val);
+      case "NULL":
+        return True;
+    }
+  }
+
+}
+
+# vim: tabstop=2 shiftwidth=2 softtabstop=2 expandtab
diff --git a/src/Log.php b/src/Log.php
new file mode 100644
index 0000000..c94cb28
--- /dev/null
+++ b/src/Log.php
@@ -0,0 +1,365 @@
+<?php
+
+namespace EesyPHP;
+
+use Throwable;
+
+
+class Log {
+
+  /*
+   * Log file path
+   * @var string|null
+   */
+  protected static $filepath = null;
+
+  /*
+   * Log file descriptor
+   * @var resource|null
+   */
+  protected static $file_fd = null;
+
+  /*
+   * Log Levels
+   * @var array(string,int)
+   */
+  protected static $levels = array(
+    'TRACE' => 0,
+    'DEBUG' => 1,
+    'INFO' => 2,
+    'WARNING' => 3,
+    'ERROR' => 4,
+    'FATAL' => 5,
+  );
+
+  /*
+   * Default log level
+   * @var string
+   */
+  protected static string $default_level = 'WARNING';
+
+  /*
+   * Current log level
+   * @var string|null
+   */
+  protected static $level = null;
+
+  /*
+   * Log PHP errors levels (as specified to set_error_handler())
+   * Default (set in self::init() method):
+   * - In TRACE or DEBUG: E_ALL & ~E_STRICT
+   * - Otherwise: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
+   */
+  protected static $php_errors_levels = null;
+
+  // Custom fatal error handler
+  protected static $fatal_error_handler = null;
+
+  /*
+   * Initialization
+   * @param string $filepath
+   * @param string|null $level
+   * @param int|null $php_errors_levels
+   * @return void
+   */
+  public static function init($filepath, $level=null, $php_errors_levels=null) {
+    self :: $filepath = $filepath;
+
+    // Set default log level (if not defined or invalid)
+    if (is_null($level)) {
+      self :: $level = self :: $default_level;
+    }
+    elseif (!array_key_exists($level, self :: $levels)) {
+      self :: $level = self :: $default_level;
+      self :: warning(
+        "Invalid log level value found in configuration (%s). ".
+        "Set as default (%s).", $level, self :: $default_level);
+    }
+    else {
+      self :: $level = $level;
+    }
+
+    // Log PHP errors
+    if (!is_null($php_errors_levels))
+      self :: $php_errors_levels = $php_errors_levels;
+    elseif (in_array(self :: $level, array('DEBUG', 'TRACE')))
+      self :: $php_errors_levels = E_ALL & ~E_STRICT;
+    else
+      self :: $php_errors_levels = E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED;
+    set_error_handler(array('EesyPHP\\Log', 'on_php_error'), self :: $php_errors_levels);
+
+    // Log uncatched exceptions
+    set_exception_handler(array('EesyPHP\\Log', 'exception'));
+  }
+
+  /**
+   * Log a message
+   * @param string $level The message level (key of self :: $levels)
+   * @param string $message The message to log
+   * @param array $extra_args Extra arguments to use to compute message using sprintf
+   * @return true
+   */
+  public static function log($level, $message, ...$extra_args) {
+    global $auth_user, $argv;
+
+    if (!array_key_exists($level, self :: $levels)) $level = self :: $default_level;
+    if (self :: $levels[$level] < self :: $levels[self :: $level]) return true;
+    if(is_null(self :: $file_fd)) {
+      self :: $file_fd = fopen(self :: $filepath, 'a');
+    }
+
+    // Extra arguments passed, format message using sprintf
+    if ($extra_args) {
+      $message = call_user_func_array(
+        'sprintf',
+        array_merge(array($message), $extra_args)
+      );
+    }
+
+    if (php_sapi_name() == "cli") {
+      $msg = implode(' - ', array(
+        date('Y/m/d H:i:s'),
+        basename($argv[0]),
+        $level,
+        $message
+      ))."\n";
+    }
+    else {
+      $msg = array(
+        date('Y/m/d H:i:s'),
+        $_SERVER['REQUEST_URI'],
+        $_SERVER['REMOTE_ADDR'],
+      );
+      if (isset($auth_user))
+        $msg[] = ($auth_user['username']?$auth_user['username']:'anonymous');
+      $msg[] = $level;
+      $msg[] = $message;
+      $msg = implode(' - ', $msg)."\n";
+    }
+
+    fwrite(self :: $file_fd, $msg);
+
+    if ($level == 'FATAL')
+      if (!is_null(self :: $fatal_error_handler))
+        call_user_func(self :: $fatal_error_handler, $message);
+      elseif (function_exists('fatal_error'))
+        fatal_error($message);
+      else
+        die("\n$message\n\n");
+    elseif (php_sapi_name() == "cli")
+      echo $msg;
+
+    return true;
+  }
+
+  /**
+   * Log a trace message
+   * @param string $message The message to log
+   * @param array $extra_args Extra arguments to use to compute message using sprintf
+   * @return true
+   */
+  public static function trace($message, ...$extra_args) {
+    return call_user_func_array(
+      array('EesyPHP\\Log', 'log'),
+      array_merge(array('TRACE', $message), $extra_args)
+    );
+  }
+
+  /**
+   * Log a debug message
+   * @param string $message The message to log
+   * @param array $extra_args Extra arguments to use to compute message using sprintf
+   * @return true
+   */
+  public static function debug($message, ...$extra_args) {
+    return call_user_func_array(
+      array('EesyPHP\\Log', 'log'),
+      array_merge(array('DEBUG', $message), $extra_args)
+    );
+  }
+
+  /**
+   * Log an info message
+   * @param string $message The message to log
+   * @param array $extra_args Extra arguments to use to compute message using sprintf
+   * @return true
+   */
+  public static function info($message, ...$extra_args) {
+    return call_user_func_array(
+      array('EesyPHP\\Log', 'log'),
+      array_merge(array('INFO', $message), $extra_args)
+    );
+  }
+
+  /**
+   * Log an warning message
+   * @param string $message The message to log
+   * @param array $extra_args Extra arguments to use to compute message using sprintf
+   * @return true
+   */
+  public static function warning($message, ...$extra_args) {
+    return call_user_func_array(
+      array('EesyPHP\\Log', 'log'),
+      array_merge(array('WARNING', $message), $extra_args)
+    );
+  }
+
+  /**
+   * Log an error message
+   * @param string $message The message to log
+   * @param array $extra_args Extra arguments to use to compute message using sprintf
+   * @return true
+   */
+  public static function error($message, ...$extra_args) {
+    return call_user_func_array(
+      array('EesyPHP\\Log', 'log'),
+      array_merge(array('ERROR', $message), $extra_args)
+    );
+  }
+
+  /**
+   * Log an fatal message
+   * @param string $message The message to log
+   * @param array $extra_args Extra arguments to use to compute message using sprintf
+   * @return true
+   */
+  public static function fatal($message, ...$extra_args) {
+    return call_user_func_array(
+      array('EesyPHP\\Log', 'log'),
+      array_merge(array('FATAL', $message), $extra_args)
+    );
+  }
+
+  /**
+   * Register a contextual fatal error handler
+   * @param null|callable $handler The fatal error handler (set as null to reset)
+   * @return void
+   */
+  public static function register_fatal_error_handler($handler) {
+    // @phpstan-ignore-next-line
+    if ($handler && !is_callable($handler))
+      self :: fatal('Invalid fatal error handler provided: it is not callable !');
+    self :: $fatal_error_handler = ($handler?$handler:null);
+  }
+
+  /**
+   * Change of current log file
+   * @param string $file The new log file path
+   * @return bool
+   */
+  public static function change_filepath($file) {
+    if ($file == self :: $filepath) return True;
+    if (self :: $file_fd) {
+      fclose(self :: $file_fd);
+      self :: $file_fd = null;
+    }
+    self :: $filepath = $file;
+    return True;
+  }
+
+  /*
+   *******************************************************************************
+   *            Handle exception logging
+   *******************************************************************************
+   */
+
+  /**
+   * Get the current backtrace
+   * @param int $ignore_last The number of last levels to ignore
+   * @return string
+   */
+  public static function get_debug_backtrace_context($ignore_last=0) {
+    $traces = debug_backtrace();
+
+    // Also ignore this function it self
+    $ignore_last++;
+
+    if (!is_array($traces) || count($traces) <= $ignore_last)
+      return "";
+
+    $msg = array();
+    for ($i=$ignore_last; $i < count($traces); $i++) {
+      $trace = array("#$i");
+      if (isset($traces[$i]['file']))
+        $trace[] = $traces[$i]['file'].(isset($traces[$i]['line'])?":".$traces[$i]['line']:"");
+      // @phpstan-ignore-next-line
+      if (isset($traces[$i]['class']) && isset($traces[$i]['function']))
+        $trace[] = implode(" ", array(
+          $traces[$i]['class'],
+          $traces[$i]['type'],
+          $traces[$i]['function']. "()"));
+      elseif (isset($traces[$i]['function']))
+        $trace[] = $traces[$i]['function']. "()";
+      $msg[] = implode(" - ", $trace);
+    }
+
+    return implode("\n", $msg);
+  }
+
+  /**
+   * Log an exception
+   * @param Throwable $exception
+   * @param string|null $prefix The prefix of the log message
+   *          (optional, default: "An exception occured")
+   * @return void
+   */
+  public static function exception($exception, $prefix=null) {
+    if (function_exists('log_in_sentry'))
+      log_in_sentry($exception);
+    // If more than 2 arguments passed, format prefix message using sprintf
+    if ($prefix && func_num_args() > 2) {
+      $prefix = call_user_func_array(
+        'sprintf',
+        array_merge(array($prefix), array_slice(func_get_args(), 2))
+      );
+    }
+    self :: error(
+      "%s:\n%s\n## %s:%d : %s",
+      ($prefix?$prefix:"An exception occured"),
+      self::get_debug_backtrace_context(1),
+      $exception->getFile(), $exception->getLine(),
+      $exception->getMessage());
+  }
+
+  /*
+   *******************************************************************************
+   *            Handle PHP error logging
+   *******************************************************************************
+   */
+
+  /**
+   * Convert PHP error number to the corresponding label
+   * @param int $errno
+   * @return string
+   */
+  public static function errno2type($errno) {
+    $constants = get_defined_constants();
+    if (is_array($constants))
+      foreach($constants as $label => $value)
+        if ($value == $errno && preg_match('/^E_(.*)$/', $label, $m))
+          return $m[1];
+    return 'UNKNOWN ERROR #'.$errno;
+  }
+
+  /**
+   * Log a PHP error
+   * Note: method design to be used as callable by set_error_handler()
+   * @param int $errno The error number
+   * @param string $errstr The error message
+   * @param string $errfile The filename that the error was raised in
+   * @param int $errline The line number where the error was raised
+   * @return false Return false to let the normal error handler continues.
+   */
+  public static function on_php_error($errno, $errstr, $errfile, $errline) {
+    $msg = sprintf(
+      "A PHP error occured : [%s] %s\nFile : %s (line : %d)",
+      self :: errno2type($errno), $errstr, $errfile, $errline
+    );
+    self :: error($msg);
+    if (function_exists('log_php_error_in_sentry'))
+      log_php_error_in_sentry($errno, $msg);
+    return False;
+  }
+}
+
+# vim: tabstop=2 shiftwidth=2 softtabstop=2 expandtab
diff --git a/src/functions.php b/src/functions.php
new file mode 100644
index 0000000..3b8f2fe
--- /dev/null
+++ b/src/functions.php
@@ -0,0 +1,216 @@
+<?php
+
+namespace EesyPHP;
+
+use EesyPHP\Log;
+
+/*
+ * Parser/formater values helpers
+ */
+$_date_format = "%d/%m/%Y";
+$_date_time_format = "%d/%m/%Y %H:%M:%S";
+function format_time($time, $with_time=true) {
+  global $_date_format, $_date_time_format;
+  if ($with_time)
+    return strftime($_date_time_format, $time);
+  return strftime($_date_format, $time);
+}
+
+function parse_date($date, $with_time=true) {
+  global $_date_format, $_date_time_format;
+  if ($with_time)
+    $ptime = strptime($date, $_date_time_format);
+  else
+    $ptime = strptime($date, $_date_format);
+  if(is_array($ptime)) {
+    return mktime(
+      $ptime['tm_hour'],
+      $ptime['tm_min'],
+      $ptime['tm_sec'],
+      $ptime['tm_mon']+1,
+      $ptime['tm_mday'],
+      $ptime['tm_year']+1900
+    );
+  }
+  return false;
+}
+
+function format_size($size, $digit=False) {
+  if (!$digit && $digit!==0) $digit=2;
+  if ($size>=1099511627776)
+    return number_format($size/1099511627776,$digit)."To";
+  elseif ($size>=1073741824)
+    return number_format($size/1073741824,$digit)."Go";
+  else if ($size>=1048576)
+    return number_format($size/1048576,$digit)."Mo";
+  else if ($size>=1024)
+    return number_format($size/1024,$digit)."Ko";
+  else
+    return $size."o";
+}
+
+/*
+ * Generic Data/value helpers
+ */
+function vardump($data) {
+  ob_start();
+  var_dump($data);
+  $data = ob_get_contents();
+  ob_end_clean();
+  return $data;
+}
+
+/**
+ * Format a callable object for logging
+ * @param  string|array $callable The callable object
+ * @return string The callable object string representation
+ */
+function format_callable($callable) {
+  if (is_string($callable))
+    return $callable."()";
+  if (is_array($callable))
+    if (is_string($callable[0]))
+      return $callable[0]."::".$callable[1]."()";
+    elseif (is_object($callable[0]))
+      return get_class($callable[0])."->".$callable[1]."()";
+    else
+      return "Unkown->".$callable[1]."()";
+  // @phpstan-ignore-next-line
+  return vardump($callable);
+}
+
+function check_is_empty($val) {
+  switch(gettype($val)) {
+    case "boolean":
+    case "integer":
+    case "double":
+    case "object":
+    case "resource":
+      return False;
+    case "array":
+    case "string":
+      if ($val == "0") return false;
+      return empty($val);
+    case "NULL":
+      return True;
+  }
+}
+
+/*
+ * Generic file/directory helpers
+ */
+function dump_file($file_path, $max_age=3600) {
+  if (is_file($file_path)) {
+    header('Content-Type: '.mime_content_type($file_path));
+    $last_modified_time = filemtime($file_path);
+    $etag = md5_file($file_path);
+    header("Cache-Control: max-age=$max_age, must-revalidate");
+    header("Last-Modified: ".gmdate("D, d M Y H:i:s", $last_modified_time)." GMT");
+    header("Etag: $etag");
+
+    if (
+      (
+        isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
+        @strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $last_modified_time
+      ) || (
+        isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
+        trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag
+      )
+    ) {
+      header("HTTP/1.1 304 Not Modified");
+      exit();
+    }
+
+    header('Pragma: public');
+    header('Content-Length: ' . filesize($file_path));
+    readfile($file_path);
+    exit();
+  }
+  header("HTTP/1.1 404 Not found");
+  exit();
+}
+
+function delete_directory($dir, $recursive=true) {
+  $files = array_diff(scandir($dir), array('.','..'));
+  if ($recursive) {
+    foreach ($files as $file) {
+      if (is_dir("$dir/$file")) {
+        if (!delete_directory("$dir/$file", true)) {
+          Log :: error("delete_directory($dir) : Fail to delete sub-directory '$dir/$file'.");
+          return false;
+        }
+      }
+      else if (!unlink("$dir/$file")) {
+        Log :: error("delete_directory($dir) : Fail to delete '$dir/$file'.");
+        return false;
+      }
+    }
+  }
+  else if (!empty($files)) {
+    Log :: error("delete_directory($dir) : Directory is not empty.");
+    return false;
+  }
+  return rmdir($dir);
+}
+
+/*
+ * Run external command helper
+ */
+/**
+ * Run external command
+ *
+ * @param $command string|array        The command. It's could be an array of the command with its
+ *                                     arguments.
+ * @param $data_stdin string|null      The command arguments (optional, default: null)
+ * @param $escape_command_args boolean If true, the command will be escaped
+ *                                     (optional, default: true)
+ *
+ * @return false|array An array of return code, stdout and stderr result or False in case of fatal
+ *                     error
+ **/
+function run_external_command($command, $data_stdin=null, $escape_command_args=true) {
+  if (is_array($command))
+    $command = implode(' ', $command);
+  if ($escape_command_args)
+    $command = escapeshellcmd($command);
+  Log :: debug("Run external command: '$command'");
+  $descriptorspec = array(
+    0 => array("pipe", "r"),  // stdin
+    1 => array("pipe", "w"),  // stdout
+    2 => array("pipe", "w"),  // stderr
+  );
+  $process = proc_open($command, $descriptorspec, $pipes);
+
+  if (!is_resource($process)) {
+    Log :: error("Fail to run external command: '$command'");
+    return false;
+  }
+
+  if (!is_null($data_stdin)) {
+    fwrite($pipes[0], $data_stdin);
+  }
+  fclose($pipes[0]);
+
+  $stdout = stream_get_contents($pipes[1]);
+  fclose($pipes[1]);
+
+  $stderr = stream_get_contents($pipes[2]);
+  fclose($pipes[2]);
+
+  $return_value = proc_close($process);
+
+  $error = (!empty($stderr) || $return_value != 0);
+  Log :: log(
+    ($error?'ERROR':'DEBUG'),
+    "External command ".($error?"error":"result").":\n".
+    "\tCommand : $command\n".
+    "\tReturn code: $return_value\n".
+    "\tOutput:\n".
+    "\t\t- Stdout :\n$stdout\n\n".
+    "\t\t- Stderr :\n$stderr"
+  );
+
+  return array($return_value, $stdout, $stderr);
+}
+
+# vim: tabstop=2 shiftwidth=2 softtabstop=2 expandtab