add_action( 'pre_get_posts', 'custom_pre_get_posts_query' ); function custom_pre_get_posts_query( $q ) { if ( ! is_admin() && $q->is_main_query() && ( is_shop() || is_product_category() || is_product_tag() ) ) { if ( isset( $_GET['orderby'] ) && 'stock_status' == $_GET['orderby'] ) { $q->set( 'meta_key', '_stock_status' ); $q->set( 'orderby', array( 'meta_value' => 'ASC', 'date' => 'DESC' ) ); } } }

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