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/* Order woocommerce shortcode by price */
add_filter( 'woocommerce_shortcode_products_query', 'woocommerce_shortcode_products_orderby' );

function woocommerce_shortcode_products_orderby( $args ) {

    $standard_array = array('menu_order','title','date','rand','id');

    if( isset( $args['orderby'] ) && !in_array( $args['orderby'], $standard_array ) ) {
        $args['meta_key'] = $args['price'];
        $args['price']  = 'meta_value_num'; 
    }

    return $args;
}




/** PLACE WITHIN SHORTCODE:  orderby="meta_value_num" **/