can not sort by 2 custom fields

[zied86]

Hello
I followed the syntax of the codex to sort by two criteria of custom fields, but unfortunately it does not work.

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

It accepts only one custom field:

$args = array(
'post_type' => 'post_type',
'posts_per_page' => '20',
'orderby' => 'custom_field1 custom_field2',	
'order' => 'ASC');

$query = new WP_Query( $args );

#15031 #17065