define(‘WP_DEBUG’, true); does not show errors

5 comments

1. The below code, inserted in your wp-config.php file, will log all errors, notices, and warnings to a file called debug.log in the wp-content directory. It will also hide the errors so they do not interrupt page generation.

   this code you must have to insert BEFORE / That’s all, stop editing! Happy blogging. / in the wp-config.php file.

   // Enable WP_DEBUG mode
   define('WP_DEBUG', true);
   
   // Enable Debug logging to the /wp-content/debug.log file
   define('WP_DEBUG_LOG', true);
   
   // Disable display of errors and warnings 
   define('WP_DEBUG_DISPLAY', false);
   @ini_set('display_errors',0);
   
   // Use dev versions of core JS and CSS files (only needed if you are modifying these core files)
   define('SCRIPT_DEBUG', true);
   

   source: https://wordpress.org/support/article/debugging-in-wordpress/

2. Add these two lines below the

   define('WP_DEBUG', true);
   
   error_reporting(E_ALL);
   ini_set('display_errors', 1);
   

   then delete them when you don’t need them any more.

3. You can write this into your .htaccess file.

   php_flag display_startup_errors on
   php_flag display_errors on
   php_flag html_errors on
   php_flag  log_errors on
   php_value error_log  /home/path/public_html/domain/PHP_errors.log
   

   Please change the error_log directory.

4. Plugins or themes that are using PHP’s set_exception_handler() (see the docs) can also cause errors to not be shown, because their callback might just silently ignore the error. For example, I experienced the exact same thing using NextGen Gallery, but once I deactivated it, errors appeared as normal on both the page and in the debug.log file.

5. Another thing to check is the WP_CONTENT_DIR variable as that is where the debug.log file would be put. It may be checked as suggested in this question, or using the Wordfence plugin->Tools->Diagnostics->WordPress Settings. Normally it is not explicitly set unless there’s a custom configuration. Though it can can be set in wp-config.php e.g. define('WP_CONTENT_DIR', '/var/www/sites/wordpress/wp-content');

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