How to disable Multisite sign-up page?

3 comments

1. [Update]

   An alternative (maybe better) is to use the following constant in wp-config.php:

   define( 'NOBLOGREDIRECT', 'http://example.com' );
   

   ---

   At the very beginning of wp-signup.php file there is this code:

   function do_signup_header() {
       do_action( 'signup_header' );
   }
   add_action( 'wp_head', 'do_signup_header' );
   

   So, it’s just a matter of adding the signup_header action hook to break any further execution and redirect the browser to other URL.

   Here, wrapped as a Must Use Plugin:

   <?php
   /*
       Plugin Name: Multisite - Prevent Sign-up Page
       Plugin Url: http://wordpress.stackexchange.com/q/85529/12615
       Version: 1.0
       Author: Rodolfo Buaiz
   */
   
   add_action( 'signup_header', 'rbz_prevent_multisite_signup' );
   
   function rbz_prevent_multisite_signup() 
   {
       wp_redirect( site_url() );
       die();
   }
   

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2. I found a solution in this article

   I had the wrong SUBDOMAIN_INSTALL setting value in my config file.

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3. Simply add the following to wp-content/mu-plugins/disable-signups.php:

   <?php
   remove_action( 'wp_head', 'do_signup_header' );
   

   The signup page will now say:

   Registration has been disabled.

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