Force theme or disallow theme change

2 comments

1. Lot of useless comments on this post from what seems like a pretty simple question.

   change below $theme_directory_name = 'twentyfourteen'; to your theme… thats all you have to do. First function sets your theme no matter what. Second one disables interface to edit themes.

   function selfish_hardcoded_theme() {
       $theme_directory_name = 'twentyfourteen';
       add_filter( 'template', create_function( '$template', 'return "' . $theme_directory_name . '";' ) );
       add_filter( 'stylesheet', create_function( '$stylesheet', 'return "' . $theme_directory_name . '";' ) );
   }
   add_action( 'setup_theme', 'selfish_hardcoded_theme', -1 );
   
   
   add_filter( 'map_meta_cap', function( $required_caps, $cap ) {
       if ( 'edit_themes' == $cap || 'switch_themes' == $cap || 'install_themes' == $cap || 'delete_themes' == $cap || 'update_themes' == $cap ) {
           $required_caps[] = 'do_not_allow';
       }
       return $required_caps;
   }, 10, 2 );
   

   Theres other ways too :

   $theme = wp_get_theme(); 
   if ('twentyfourteen' !== $theme->name || 'twentyfourteen' !== $theme->parent_theme) { 
       switch_theme( 'twentyfourteen' );
   }
   

   You can also set the default theme constant in your wp-config.

   Lastly, remove themes menu from admin:

   function remove_themes_submenus() {
     global $submenu;
     unset($submenu['themes.php'][5]); // Removes 'Themes'
     unset($submenu['themes.php'][15]); // Removes Theme Installer tab
   }
   add_action('admin_menu', 'remove_themes_submenus');
   

2. You could create a custom admin role and remove these standard admin capabilities:

   function remove_admin_capabilities() {
   
       $admin = get_role( 'administrator' );
   
        $caps = array(
           'install_themes',
           'update_themes',
           'delete_themes',
           'edit_themes',
           'switch_themes',
           'edit_theme_options',
       );
   
       foreach ( $caps as $cap ) {
   
           $admin->remove_cap( $cap );
       }
   }
   add_action( 'init', 'remove_admin_capabilities' );
   

   Or simply force them to use the Editor role.

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