diff --git a/includes/cli.php b/includes/cli.php
index 95eb6e1..2968639 100644
--- a/includes/cli.php
+++ b/includes/cli.php
@@ -5,12 +5,12 @@ function add_cli_command($command, $handler, $short_desc, $usage_args=false, $lo
                          $override=false) {
   global $cli_commands;
   if (array_key_exists($command, $cli_commands) && !$override) {
-    logging('ERROR', sprintf(_("The CLI command '%s' already exists.", $command)));
+    logging('ERROR', _("The CLI command '%s' already exists.", $command));
     return False;
   }
 
   if (!is_callable($handler)) {
-    logging('ERROR', sprintf(_("The CLI command '%s' handler is not callable !"), $command));
+    logging('ERROR', _("The CLI command '%s' handler is not callable !"), $command);
     return False;
   }
 
@@ -41,6 +41,14 @@ $cli_command = null;
 function usage($error=false) {
   global $cli_commands, $cli_command, $argv;
 
+  // If more than 1 arguments passed, format error message using sprintf
+  if (func_num_args() > 1) {
+    $error = call_user_func_array(
+      'sprintf',
+      array_merge(array($error), array_slice(func_get_args(), 1))
+    );
+  }
+
   if ($error)
     echo "$error\n\n";
   printf(_("Usage: %s [-h] [-qd] command\n"), basename($argv[0]));
@@ -115,10 +123,10 @@ function handle_cli_args() {
             $command_args[] = $argv[$i];
           else
             usage(
-              sprintf(
-                _("Invalid parameter \"%s\".\nNote: Command's parameter/argument must be place ".
-                "after the command."), $argv[$i]
-              )
+              _(
+                "Invalid parameter \"%s\".\nNote: Command's parameter/argument must be place ".
+                "after the command."
+              ), $argv[$i]
             );
       }
     }
@@ -128,11 +136,8 @@ function handle_cli_args() {
     usage();
 
   logging(
-    'DEBUG', sprintf(
-      "Run %s command %s with argument(s) '%s'.",
-      basename($argv[0]), $cli_command,
-      implode("', '", $command_args)
-    )
+    'DEBUG', "Run %s command %s with argument(s) '%s'.",
+    basename($argv[0]), $cli_command, implode("', '", $command_args)
   );
 
   try {
@@ -141,7 +146,7 @@ function handle_cli_args() {
     exit($result?0:1);
   }
   catch(Exception $e) {
-    log_exception(sprintf(_("An exception occured running command %s"), $cli_command));
+    log_exception($e, _("An exception occured running command %s"), $cli_command);
     exit(1);
   }
 }
@@ -259,7 +264,7 @@ function cli_show($command_args) {
   $item = get_item($item_id);
 
   if (!$item)
-    logging('FATAL', sprintf(_("Item #%s not found."), $item_id));
+    logging('FATAL', _("Item #%s not found."), $item_id);
 
   print_item_info($item);
   return True;
@@ -283,7 +288,7 @@ function cli_delete($command_args) {
   $item_id = $command_args[0];
   $item = get_item($item_id);
   if (!$item)
-    logging('FATAL', sprintf(_("Item #%s not found."), $item_id));
+    logging('FATAL', _("Item #%s not found."), $item_id);
 
   print_item_info($item);
 
@@ -298,7 +303,7 @@ function cli_delete($command_args) {
   echo "\n";
 
   if (!delete_item($item['id']))
-    logging('FATAL', sprintf(_("An error occured deleting item #%d."), $item_id));
+    logging('FATAL', _("An error occured deleting item #%d."), $item_id);
 
   return True;
 }
@@ -376,31 +381,27 @@ function cli_cron($command_args) {
   foreach($items['items'] as $item) {
     if ($item['date'] < $limit) {
       if ($just_try) {
-        logging('DEBUG', sprintf(
-          'Just-try mode: do not really delete item #%s (%s, creation date: %s)',
+        logging('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', sprintf(
-          'Item #%s (%s) deleted (creation date: %s)',
-
-        ));
+        logging('INFO', 'Item #%s (%s) deleted (creation date: %s)',
+          $item['id'], $item['name'], format_time($item['date'])
+        );
         remove_item_attachments($item['id']);
       }
       else {
-        logging('ERROR', sprintf(
-          'Fail to delete item "%s" (%s, creation date: %s)',
+        logging('ERROR', 'Fail to delete item "%s" (%s, creation date: %s)',
           $item['id'], $item['name'], format_time($item['date'])
-        ));
+        );
         $error = true;
       }
     }
     else {
-      logging('DEBUG', sprintf(
-        'Item "%s" (%s) still valid (creation date: %s)',
+      logging('DEBUG', 'Item "%s" (%s) still valid (creation date: %s)',
         $item['id'], $item['name'], format_time($item['date'])
-      ));
+      );
     }
   }
   exit($error?1:0);
diff --git a/includes/db.php b/includes/db.php
index 2c3ff8d..5fa3d6a 100644
--- a/includes/db.php
+++ b/includes/db.php
@@ -353,7 +353,10 @@ function search_items($params) {
       logging('ERROR', 'search_items() : search in DB return false');
   }
   catch (Exception $e) {
-    log_exception($e, "An exception occured searching items with params ".preg_replace("/\n[ \t]*/"," ",print_r($params,1))." infos from database : ");
+    log_exception(
+      $e, "An exception occured searching items with params %s infos from database : ",
+      preg_replace("/\n[ \t]*/", " ", print_r($params, true))
+    );
   }
   return false;
 }
diff --git a/includes/logging.php b/includes/logging.php
index 731e928..4de09ff 100644
--- a/includes/logging.php
+++ b/includes/logging.php
@@ -37,6 +37,14 @@ function logging($level, $message) {
     $_log_file_fd = fopen($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") {
     $msg = implode(' - ', array(
       date('Y/m/d H:i:s'),
@@ -110,18 +118,27 @@ function get_debug_backtrace_context($ignore_last=0) {
   return implode("\n", $msg);
 }
 
-function log_exception($exception, $prefix='') {
+function log_exception($exception, $prefix=null) {
+  // If more than 2 arguments passed, format prefix message using sprintf
+  if ($prefix && func_num_args() > 2) {
+    $prefix = call_user_func_array(
+      'sprintf',
+      array_merge(array($prefix), array_slice(func_get_args(), 2))
+    );
+  }
   logging(
-    "ERROR",
-    ($prefix?"$prefix :\n":"An exception occured :\n").
-    get_debug_backtrace_context(1). "\n" .
-    "## ".$exception->getFile().":".$exception->getLine(). " : ". $exception->getMessage());
+    "ERROR", "%s:\n%s\n## %s:%d : %s",
+    ($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
 function log_php_eror($errno, $errstr, $errfile, $errline) {
-  logging("ERROR", "A PHP error occured : [$errno] $errstr\nFile : $errfile (line : $errline)");
+  logging("ERROR", "A PHP error occured : [%d] %s\nFile : %s (line : %d)",
+    $errno, $errstr, $errfile, $errline);
   return False;
 }
 if ($log_level == 'DEBUG')
diff --git a/includes/smarty.php b/includes/smarty.php
index 4190ad5..dafd3fc 100644
--- a/includes/smarty.php
+++ b/includes/smarty.php
@@ -85,13 +85,27 @@ $smarty->assign('session_key', $_SESSION['session_key']);
 if (!isset($_SESSION['errors']))
   $_SESSION['errors']=array();
 function add_error($error) {
-  $_SESSION['errors'][]=$error;
+  // If more than one arguments passed, format error message using sprintf
+  if (func_num_args() > 2) {
+    $error = call_user_func_array(
+      'sprintf',
+      array_merge(array($error), array_slice(func_get_args(), 1))
+    );
+  }
+  $_SESSION['errors'][] = $error;
 }
 
 if (!isset($_SESSION['messages']))
   $_SESSION['messages']=array();
 function add_message($message) {
-  $_SESSION['messages'][]=$message;
+  // If more than one 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(), 1))
+    );
+  }
+  $_SESSION['messages'][] = $message;
 }
 
 // Handle CSS & JS files included
@@ -133,6 +147,13 @@ function display_template($template, $pagetitle=false) {
   if (!$template)
     logging("FATAL", _("No template specified."));
   global $smarty;
+  // If more than 2 arguments passed, format pagetitle using sprintf
+  if ($pagetitle & func_num_args() > 2) {
+    $pagetitle = call_user_func_array(
+      'sprintf',
+      array_merge(array($pagetitle), array_slice(func_get_args(), 2))
+    );
+  }
   try {
     _defineCommonTemplateVariables($template, $pagetitle);
     $smarty->display($template);
diff --git a/includes/translation-cli.php b/includes/translation-cli.php
index 364197b..fadf791 100644
--- a/includes/translation-cli.php
+++ b/includes/translation-cli.php
@@ -162,24 +162,14 @@ function cli_update_messages($command_args) {
   $compendium_args = array();
   foreach ($command_args as $path) {
     if (!file_exists($path))
-      logging(
-        'FATAL', sprintf(
-          _("Compendium file %s not found."),
-          $path
-        )
-      );
+      logging('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', sprintf(
-        _("POT file not found (%s). Please run extract_messages first."),
-        $pot_file
-      )
-    );
+    logging('FATAL', _("POT file not found (%s). Please run extract_messages first."), $pot_file);
 
   if ($dh = opendir($root_lang_dir)) {
     $error = False;
@@ -191,16 +181,14 @@ function cli_update_messages($command_args) {
       )
         continue;
 
-      logging('DEBUG', sprintf(_("Lang directory '%s' found"), $file));
+      logging('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', sprintf(
-          _("LC_MESSAGES directory not found in lang '%s' directory, ignore it."),
-          $lang)
-        );
+        logging('DEBUG', _("LC_MESSAGES directory not found in lang '%s' directory, ignore it."),
+          $lang);
         continue;
       }
 
@@ -214,10 +202,8 @@ function cli_update_messages($command_args) {
         if (is_array($result) && $result[0] == 0) {
           $created = true;
         } else {
-          logging('ERROR', sprintf(
-            _("Fail to init messages in %s PO file using msginit (%s)."),
-            $lang, $po_file)
-          );
+          logging('ERROR', _("Fail to init messages in %s PO file using msginit (%s)."),
+            $lang, $po_file);
           $error = True;
         }
       }
@@ -234,25 +220,20 @@ function cli_update_messages($command_args) {
           )
         );
         if (!is_array($result) || $result[0] != 0) {
-          logging('ERROR', sprintf(
-            _("Fail to update messages in %s PO file using msgmerge (%s)."),
-            $lang, $po_file)
-          );
+          logging('ERROR', _("Fail to update messages in %s PO file using msgmerge (%s)."),
+            $lang, $po_file);
           $error = True;
         }
       }
       elseif (!$created) {
-        logging('DEBUG', sprintf(
-          _("PO file not found in lang '%s' directory, ignore it."),
-          $lang)
-        );
+        logging('DEBUG', _("PO file not found in lang '%s' directory, ignore it."), $lang);
       }
     }
     closedir($dh);
     return !$error;
   }
 
-  logging('FATAL', sprintf(_("Fail to open root lang directory (%s)."), $root_dir_path));
+  logging('FATAL', _("Fail to open root lang directory (%s)."), $root_dir_path);
 }
 add_cli_command(
   'update_messages',
@@ -286,70 +267,53 @@ function cli_compile_messages($command_args) {
         if (dirname($real_lang_dir) != '.' || !is_dir($root_lang_dir . '/' . $real_lang_dir))
           continue;
         $lang = $file;
-        logging('DEBUG', sprintf(_("Lang alias symlink found: %s -> %s"), $lang, $real_lang_dir));
+        logging('DEBUG', _("Lang alias symlink found: %s -> %s"), $lang, $real_lang_dir);
 
         // Create JSON catalog symlink (if not exists)
         $json_link = "$root_dir_path/public_html/translations/$lang.json";
         $link_target = "$real_lang_dir.json";
         if (!file_exists($json_link)) {
           if (symlink($link_target, $json_link)) {
-            logging(
-              'INFO',
-              sprintf(
-                _("JSON catalog symlink for %s -> %s created (%s)"),
-                $lang, $real_lang_dir, $json_link)
-            );
+            logging('INFO', _("JSON catalog symlink for %s -> %s created (%s)"),
+              $lang, $real_lang_dir, $json_link);
           }
           else {
-            logging(
-              'ERROR',
-              sprintf(
-                _("Fail to create JSON catalog symlink for %s -> %s (%s)"),
-                $lang, $real_lang_dir, $json_link)
-            );
+            logging('ERROR', _("Fail to create JSON catalog symlink for %s -> %s (%s)"),
+              $lang, $real_lang_dir, $json_link);
             $error = True;
           }
         }
         elseif (readlink($json_link) == $link_target) {
-          logging(
-            'DEBUG',
-            sprintf(
-              _("JSON catalog symlink for %s -> %s already exist (%s)"),
-              $lang, $real_lang_dir, $json_link)
-          );
+          logging('DEBUG', _("JSON catalog symlink for %s -> %s already exist (%s)"),
+            $lang, $real_lang_dir, $json_link);
         }
         else {
           logging(
             'WARNING',
-            sprintf(
-              _("JSON catalog file for %s already exist, but it's not a symlink to %s (%s)"),
-              $lang, $real_lang_dir, $json_link)
+            _("JSON catalog file for %s already exist, but it's not a symlink to %s (%s)"),
+            $lang, $real_lang_dir, $json_link
           );
           $error = True;
         }
         continue;
       }
 
-      logging('DEBUG', sprintf(_("Lang directory '%s' found"), $file));
+      logging('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', sprintf(
-          _("LC_MESSAGES directory not found in lang '%s' directory, ignore it."),
-          $lang)
-        );
+        logging('DEBUG', _("LC_MESSAGES directory not found in lang '%s' directory, ignore it."),
+          $lang);
         continue;
       }
 
       // Test .PO file is present
       $po_file = $lang_dir . '/' . TEXT_DOMAIN . '.po';
       if (!is_file($po_file)) {
-        logging('DEBUG', sprintf(
-          _("PO file not found in lang '%s' directory, ignore it."),
-          $lang)
-        );
+        logging('DEBUG', _("PO file not found in lang '%s' directory, ignore it."),
+          $lang);
         continue;
       }
 
@@ -360,9 +324,10 @@ function cli_compile_messages($command_args) {
         array("msgfmt", "-o", $mo_file, $po_file)
       );
       if (!is_array($result) || $result[0] != 0) {
-        logging('ERROR', sprintf(
+        logging(
+          'ERROR',
           _("Fail to compile messages from %s PO file as MO file using msgfmt (%s)."),
-          $lang, $po_file)
+          $lang, $po_file
         );
         $error = True;
       }
@@ -371,31 +336,24 @@ function cli_compile_messages($command_args) {
       $json_catalog = po2json($lang, $po_file);
       $json_file = "$root_dir_path/public_html/translations/$lang.json";
       if(!$fd = fopen($json_file, 'w')) {
-        logging('ERROR', sprintf(
-          _("Fail to open %s JSON catalog file in write mode (%s)."),
-          $lang, $json_file)
-        );
+        logging('ERROR', _("Fail to open %s JSON catalog file in write mode (%s)."),
+          $lang, $json_file);
         $error = True;
       }
       elseif (fwrite($fd, $json_catalog) === false) {
-        logging('ERROR', sprintf(
-          _("Fail to write %s JSON catalog in file (%s)."),
-          $lang, $json_file)
-        );
+        logging('ERROR', _("Fail to write %s JSON catalog in file (%s)."),
+          $lang, $json_file);
         $error = True;
       }
       else {
-        logging('INFO', sprintf(
-          _("%s JSON catalog writed (%s)."),
-          $lang, $json_file)
-        );
+        logging('INFO', _("%s JSON catalog writed (%s)."), $lang, $json_file);
       }
     }
     closedir($dh);
 
     return !$error;
   }
-  logging('FATAL', sprintf(_("Fail to open root lang directory (%s)."), $root_dir_path));
+  logging('FATAL', _("Fail to open root lang directory (%s)."), $root_dir_path);
 }
 add_cli_command(
   'compile_messages',
diff --git a/includes/url-public.php b/includes/url-public.php
index 41921e7..f7849a6 100644
--- a/includes/url-public.php
+++ b/includes/url-public.php
@@ -125,8 +125,8 @@ function handle_show($request) {
   ));
 
   display_template(
-    "show.tpl",
-    sprintf(_("Element %s"), (is_array($item)?$item['name']:"#".$request -> id))
+    "show.tpl", _("Element %s"),
+    (is_array($item)?$item['name']:"#".$request -> id)
   );
 }
 add_url_handler('|^item/(?P<id>[0-9]+)$|', 'handle_show');
@@ -139,7 +139,7 @@ function handle_create($request) {
   if (isset($_POST['submit']) && empty($field_errors)) {
     $item = add_item($info);
     if (is_array($item)) {
-      add_message(sprintf(_("The element '% s' has been created."), $item['name']));
+      add_message(_("The element '% s' has been created."), $item['name']);
       redirect('item/'.$item['id']);
     }
     else {
@@ -180,11 +180,11 @@ function handle_modify($request) {
       }
       logging('DEBUG', 'Changes : '.vardump($changes));
       if (empty($changes)) {
-        add_message(sprintf(_("You have not made any changes to element '% s'."), $item['name']));
+        add_message(_("You have not made any changes to element '% s'."), $item['name']);
         redirect('item/'.$item['id']);
       }
       else if (update_item($item['id'], $changes) === true) {
-        add_message(sprintf(_("The element '% s' has been updated successfully."), $item['name']));
+        add_message(_("The element '% s' has been updated successfully."), $item['name']);
         redirect('item/'.$item['id']);
       }
       else {
@@ -207,7 +207,10 @@ function handle_modify($request) {
     error_404();
   }
 
-  display_template("form.tpl", sprintf(_("Element %s: Modification"), (is_array($item)?$item['name']:"#".$request -> id)));
+  display_template(
+    "form.tpl", _("Element %s: Modification"),
+    (is_array($item)?$item['name']:"#".$request -> id)
+  );
 }
 add_url_handler('|^item/(?P<id>[0-9]+)/modify$|', 'handle_modify');
 
@@ -216,7 +219,7 @@ function handle_archive($request) {
 
   $item = get_item_from_url($request -> id);
   if(!is_array($item)) {
-    add_error(sprintf(_("Item #% s not found."), $request -> id));
+    add_error(_("Item #% s not found."), $request -> id);
     redirect('item');
   }
   elseif ($item['status'] == 'archived') {
@@ -226,9 +229,7 @@ function handle_archive($request) {
     add_error(_('You cannot archive this item.'));
   }
   else if (archive_item($item['id']) === true) {
-    add_message(sprintf(
-      _("The element '% s' has been archived successfully."),
-      $item['name']));
+    add_message(_("The element '% s' has been archived successfully."), $item['name']);
   }
   else {
     add_error(_('An error occurred while archiving this item.'));
@@ -242,15 +243,13 @@ function handle_delete($request) {
 
   $item = get_item_from_url($request -> id);
   if(!is_array($item)) {
-    add_error(sprintf(_("Item #% s not found."), $request -> id));
+    add_error(_("Item #% s not found."), $request -> id);
   }
   else if (!can_delete($item)) {
     add_error(_('You cannot delete this item.'));
   }
   else if (delete_item($item['id']) === true) {
-    add_message(sprintf(
-      _("The element '% s' has been deleted successfully."),
-      $item['name']));
+    add_message(_("The element '% s' has been deleted successfully."), $item['name']);
   }
   else {
     add_error(_('An error occurred while deleting this item.'));