您可以使用WP_查询：

$query = new WP_Query( array ( \'post_type\' => \'product\', \'orderby\' => \'meta_value\', \'meta_key\' => \'price\' ) );

参考：-

http://codex.wordpress.org/Class_Reference/WP_Query#Order_.26_Orderby_Parameters

你可以这样做

//代码如下：-

function modify_query($query){
 //set this input in the orderby form
//and check if its from the form and the request something like this
if(!isset($_GET[\'check\']) || $_GET[\'check\'] != \'check\')
    return;

//then you can change the query as per request
if ($query->is_main_query() && isset($_GET[\'orderby\'])) {
    $query->set(\'orderby\', \'meta_value\' );
    switch($_GET[\'orderby\']){
        case \'class\':
            $query->set(\'meta_key\', \'some_key\');
            break;
        case \'section\':
            $query->set(\'meta_key\', \'other_key\');
            break;
        //add like this
    }

}
}

add_action(\'pre_get_posts\', \'modify_query\');