WP DEBUG is a permanent global variable in PHP that can be used to activate the “debug” mode in WordPress. It is assumed to be false by default, but on development copies of WordPress, it is usually set to true in the wp-config.php file.
define( 'WP_DEBUG', true );
define( 'WP_DEBUG', false );
WP_DEBUG_LOG and WP_DEBUG_DISPLAY
WP DEBUG LOG and WP DEBUG DISPLAY are PHP constants that extend WP DEBUG and can be used to debug WordPress as well.
WP DEBUG LOG is a plugin that works with WP DEBUG to save all errors to a debug.log log file in the /wp-content/ directory. This is important if you wish to review all notices later or if you need to see notices that were generated off-screen (for example, during an AJAX request or a wp-cron run).
define( 'WP_DEBUG_LOG', true );
WP DEBUG DISPLAY is a companion to WP DEBUG that determines whether or not debug messages are displayed within the HTML of pages. The default value is ‘true,’ which displays errors and warnings as they occur. If you set this to false, all mistakes will be hidden. This should be used in conjunction with WP DEBUG LOG to allow for subsequent analysis of failures.
define( 'WP_DEBUG_DISPLAY', false );
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