Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) media upload popup are printed.
wp-admin/includes/media.php:606wp_iframe() /** * Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) * media upload popup are printed. * * @since 2.9.0 */ do_action( 'admin_head-media-upload-popup' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores /** This action is documented in wp-admin/admin-header.php */ do_action( 'admin_head' ); if ( is_string( $content_func ) ) { /**Introduced in 2.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.