Run a function when a new site is created in WordPress Multisite

2 comments

1. I guess you are looking for an action/filter.

   wpmu_new_blog this action is fired in wpmu_create_blog function (wp-includes/ms-functions.php)

   do_action( 'wpmu_new_blog', $blog_id, $user_id, $domain, $path, $site_id, $meta );
   

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2. Since WP 5.1.0, wpmu_new_blog has been deprecated in favour of wp_insert_site:

   /**
    * Fires once a site has been inserted into the database.
    *
    * @since 5.1.0
    *
    * @param WP_Site $new_site New site object.
    */
   do_action( 'wp_insert_site', $new_site );
   

   Use it like this in your plugin or theme:

   add_action('wp_insert_site', function($site) {
     // do something
   });
   

   A good place to look for available hooks is wp-includes/ms-default-filters.php

   wp_insert_site on WordPress Developer Handbook

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