Run functions only in the admin area?

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I’d like this code to only run inside the admin area as it is resorting the items on the public side admin bar too.

  /* Reorder Admin Menu to put "Pages" at the top */
  function menu_order_filter($menu) {
  $content_menu = array('edit.php?post_type=page');
  array_splice($menu, 2, 0, $content_menu);
  return array_unique($menu);
  }
  add_filter('custom_menu_order', create_function('', 'return true;'));
  add_filter('menu_order', 'menu_order_filter');

4 s
4

There is very little overhead to assigning couple of filters on hooks that simply won’t fire on front end.

In general it would be something like this:

add_action('init', 'admin_only');

function admin_only() {

    if( !is_admin() )
        return;

    // filter assignemnts and such go here
}

Also create_function() is not recommended for performance and some other reasons. It is better to use more modern Anonymous Functions, but for cases like this WordPress provides ready-made __return_true() function.

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