Answers for "https://codex.wordpress.org/WP_DEBUG"

WordPress debug

// 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 );

wp_debug

// WP_DEBUG is a PHP constant (a permanent global variable) that can be used to trigger the "debug" mode throughout WordPress.
// WP_DEBUG_LOG and WP_DEBUG_DISPLAY are additional PHP constants that extend WP_DEBUG, and may also be used to debug WordPress.
 
define( 'WP_DEBUG', true );