WP: Debug configuration for wp-config.php

wp-config.php

<?php

// Uncomment to enable WP_DEBUG. Of course, you want to change this cookie value to something else.
//define( 'WP_DEVELOPER_COOKIE', 'V1AgRGV2ZWxvcGVyIGZvciBkb21haW4uY29tIGRlYnVnZ2luZyBwdXJwb3Nlcy4=' );

// Enable WP DEBUG if debug query parameter exists OR the "wp_developer" cookie exists with a specific value (WP_DEVELOPER_COOKIE).
$wp_debug = (
	isset( $_GET['debug'] ) ||
	( isset( $_COOKIE['wp_developer'] ) && defined( 'WP_DEVELOPER_COOKIE' ) && $_COOKIE['wp_developer'] == WP_DEVELOPER_COOKIE )
);

define( 'WP_DEBUG', $wp_debug );
define( 'WP_DEBUG_LOG', $wp_debug );
define( 'SCRIPT_DEBUG', $wp_debug );

// Enable WP DEBUG_DISPLAY if debug query parameter equals "display".
define('WP_DEBUG_DISPLAY', ( $wp_debug && isset( $_GET['debug'] ) && ( 'display' === $_GET['debug'] ) ));