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функция не описана

WC_Email_Cancelled_Order::get_content_html() public WC 1.0

Get content html.

Это метод класса: WC_Email_Cancelled_Order{}

Хуков нет.

Возвращает

Строку.

Использование

$WC_Email_Cancelled_Order = new WC_Email_Cancelled_Order();
$WC_Email_Cancelled_Order->get_content_html();

Код WC_Email_Cancelled_Order::get_content_html() WC 4.5.2

woocommerce/includes/emails/class-wc-email-cancelled-order.php
<?php
public function get_content_html() {
	return wc_get_template_html(
		$this->template_html,
		array(
			'order'              => $this->object,
			'email_heading'      => $this->get_heading(),
			'additional_content' => $this->get_additional_content(),
			'sent_to_admin'      => true,
			'plain_text'         => false,
			'email'              => $this,
		)
	);
}