WordPress at a glance
function is not described

WC_Order::set_billing_first_name() public WC 1.0

Set billing first name.

{} It's a method of the class: WC_Order{}

No Hooks.

Return

Null. Nothing.

Usage

$WC_Order = new WC_Order();
$WC_Order->set_billing_first_name( $value );
$value(string) (required)
Billing first name.

Code of WC_Order::set_billing_first_name() WC 5.0.0

<?php
public function set_billing_first_name( $value ) {
	$this->set_address_prop( 'first_name', 'billing', $value );
}