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Add a user to the Super admin user list in WordPress Multisite
<code style="color: #000000"> <span style="color: #0000BB"><?php grant_super_admin</span><span style="color: #007700">( </span><span style="color: #0000BB">$user_id </span><span style="color: #007700">); </span><span style="color: #0000BB">?></span> </code>
Since: Wordpress 3.0.0
grant_super_admin() is located in wp-admin/includes/ms.php.