Fires in head section for all admin pages.
wp-admin/admin-header.php:168file scopewp-admin/includes/media.php:591wp_iframe()wp-admin/includes/template.php:2172iframe_header() /** * Fires in head section for all admin pages. * * @since 2.1.0 */do_action( 'admin_head' ); if ( 'f' === get_user_setting( 'mfold' ) ) { $admin_body_class .= ' folded';} if ( ! get_user_setting( 'unfold' ) ) {Introduced in 2.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.