* @param string $handle Script name
* @param string $src Script url
* @param array $deps (optional) Array of script names on which this script depends
- * @param string|bool $ver (optional) Script version (used for cache busting), set to NULL to disable
+ * @param string|bool $ver (optional) Script version (used for cache busting), set to null to disable
* @param bool $in_footer (optional) Whether to enqueue the script before </head> or before </body>
* @return null
*/