我有这个问题：

$args = array(
  \'posts_per_page\' => -1,
  \'post_type\'    => \'page\',
  \'post_status\' => \'publish\',
  \'meta_query\'  => array(
    \'relation\'    => \'AND\',
    \'tipo_pagina_clause\' => array(
      \'key\'    => \'tipo_pagina\',
      \'value\'    => \'prodotto\',
      \'compare\'  => \'=\'
    ),
    \'tipo_prodotto_clause\' => array(
      \'key\'    => \'tipo_prodotto\',
      \'compare\'  => \'EXISTS\',
    ),
    array(
      \'key\'    => \'brand\',
      \'value\'    => get_the_id(),
      \'compare\'  => \'LIKE\',
    ),
  ),
  \'orderby\' => array(
    \'tipo_prodotto_clause\' => \'ASC\',
    \'post_title\' => \'asc\',
  ),
);
// query
$prodotti_brand = new WP_Query( $args );

一切正常，但我想要的是“post\\u title”=>“rand”，但“rand”似乎不起作用。我做错了什么？

\'order\' => \'ASC\',  
\'orderby\' => \'rand\',