Fires within the head section of the site sign-up screen.
wp-signup.php:35do_signup_header()function do_signup_header() { /** * Fires within the head section of the site sign-up screen. * * @since 3.0.0 */ do_action( 'signup_header' );}add_action( 'wp_head', 'do_signup_header' ); if ( ! is_multisite() ) { wp_redirect( wp_registration_url() ); die();Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.