The load-* hook fires in a number of contexts. This hook is for core screens. The dynamic portion of the hook name, $pagenow, is a global variable referring to the filename of the current screen, such as 'admin.php', 'post-new.php' etc. A complete hook for the latter would be 'load-post-new.php'.
384* referring to the filename of the current screen, such as'admin.php',385*'post-new.php' etc.A complete hook for the latter would be386*'load-post-new.php'.387*388* @since 2.1.0389*/390do_action("load-{$pagenow}");// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores391392/*393 * The following hooks are fired to ensure backward compatibility.394 * In all other cases, 'load-' . $pagenow should be used instead.395 */396if('page'===$typenow){
History
Introduced in 2.1.0. Unchanged from 6.7.7 through 7.1.0.