I am trying to customize the registration form on a WP Multisite installation. I’ve done this successfully in the past on a single site install using the register_form hook to add fields to the form, but that hook does not work with multisite. On the documentation for register_form, there is a note:
WordPress MS Note: For WordPress MS (Multi-Site), use the ‘signup_header’ action to redirect users away from the signup.
There is no documentation for signup_header, and when I attempt to redirect away from the signup using that hook, I get a “headers already sent” error stemming from the header.php file. For testing purposes, I am using the default theme with no plugins.
add_action( 'signup_header', 'test_signup_redirect' );
function test_signup_redirect() {
wp_redirect( "http://google.com" );
exit;
}
Has anybody successfully customized the registration form on a multisite setup? Does anyone have any insight on the note in the documentation regarding the signup_header hook?
