Debug Wordpress

Add following to wp-config.php.

Activate Debug Mode

// 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', true );
@ini_set( 'display_errors', 1 );

// Use dev versions of core JS and CSS files (only needed if you are modifying these core files)
define( 'SCRIPT_DEBUG', true );

define('WP_CACHE', false);

Deactivate Debug Mode

// Enable WP_DEBUG mode
define( 'WP_DEBUG', false );

// Enable Debug logging to the /wp-content/debug.log file
define( 'WP_DEBUG_LOG', false );

// 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', false );

define('WP_CACHE', true);

Key words: wp debug