From bb62e5b53b14bbd0201d18017e1f8ea293bd684e Mon Sep 17 00:00:00 2001
From: Benjamin Renard <brenard@zionetrix.net>
Date: Mon, 27 Feb 2023 23:43:47 +0100
Subject: [PATCH] Log: log an error when fail to open log file and add
 error_log() fallback

---
 src/Log.php | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/Log.php b/src/Log.php
index ba8642b..c2caf9a 100644
--- a/src/Log.php
+++ b/src/Log.php
@@ -19,6 +19,12 @@ class Log {
    */
   protected static $file_fd = null;
 
+  /**
+   * PHP error_log() fallback if no filepath configured or fail to open log file
+   * @var bool
+   */
+  protected static $error_log_fallback = true;
+
   /*
    * Log Levels
    * @var array(string,int)
@@ -77,6 +83,9 @@ class Log {
     else
       self :: $filepath = App::get('log.file_path');
 
+    // PHP error_log() fallback
+    self :: $error_log_fallback = App::get('log.error_log_fallback', true, 'bool');
+
     // Set log level
     self :: set_level($level?$level:App::get('log.level'));
 
@@ -138,6 +147,8 @@ class Log {
     if (self :: $levels[$level] < self :: $levels[self :: $level]) return true;
     if(self :: $filepath && is_null(self :: $file_fd)) {
       self :: $file_fd = fopen(self :: $filepath, 'a');
+      if (self :: $file_fd === false)
+        self :: error('Fail to open log file (%s)', self :: $filepath);
     }
 
     // Extra arguments passed, format message using sprintf
@@ -170,6 +181,8 @@ class Log {
     }
     if (self :: $file_fd)
       fwrite(self :: $file_fd, $msg);
+    elseif (self :: $error_log_fallback)
+      error_log($msg);
 
     if ($level == 'FATAL')
       if (!is_null(self :: $fatal_error_handler))