Non-empty parts ready to be joined with a separator. */ public static function parts_for_order( WC_Order $order ): array { $date_created = $order->get_date_created(); $customer_name = trim( $order->get_billing_first_name() . ' ' . $order->get_billing_last_name() ); $customer_email = $order->get_billing_email(); $order_number = $order->get_order_number(); $order_date_text = $date_created ? wc_format_datetime( $date_created ) : ''; if ( '' !== $order_date_text ) { $order_summary = sprintf( /* translators: 1: order number, 2: order date */ __( 'Order #%1$s (%2$s)', 'woocommerce' ), $order_number, $order_date_text ); } else { $order_summary = sprintf( /* translators: %s: order number */ __( 'Order #%s', 'woocommerce' ), $order_number ); } return array_values( array_filter( array( $customer_name, $customer_email, $order_summary, ) ) ); } }