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在WooCommerce中加入日期前綴至訂單編號。透過自訂函式change_woocommerce_order_number，擷取訂單日期並與原始訂單ID組合，形成新的訂單編號格式。
原始文章
//--- Add Order Number Prefix and Suffix ---//
function change_woocommerce_order_number( $order_id ) {
$order = new WC_Order($order_id);
$datetime = new DateTime($order->order_date);
$date = $datetime->format('Y-m-d');
$dateSerial = explode("-", $date);
$new_order_id = $dateSerial[0].$dateSerial[1].$dateSerial[2].$order_id;
return $new_order_id;
}
add_filter( 'woocommerce_order_number', 'change_woocommerce_order_number' );
