woocommerce_upsells_orderby │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_upsells_orderby', 'wp_kama_woocommerce_upsells_orderby_filter' );

/**
 * Function for `woocommerce_upsells_orderby` filter-hook.
 * 
 * @param  $args[orderby] 
 *
 * @return 
 */
function wp_kama_woocommerce_upsells_orderby_filter( $args[orderby] ){

	// filter...
	return $args[orderby];
}

$args[orderby]

-

Where the hook is called

$orderby = apply_filters( 'woocommerce_upsells_orderby', isset( $args['orderby'] ) ? $args['orderby'] : $orderby );

Where the hook is used in WooCommerce