woocommerce_email_headers │ хук-фильтр │ WC 1.0

Использование

add_filter( 'woocommerce_email_headers', 'wp_kama_woocommerce_email_headers_filter', 10, 4 );

/**
 * Function for `woocommerce_email_headers` filter-hook.
 * 
 * @param  $header 
 * @param  $id     
 * @param  $object 
 * @param  $that   
 *
 * @return 
 */
function wp_kama_woocommerce_email_headers_filter( $header, $id, $object, $that ){

	// filter...
	return $header;
}

$header

-

$id

-

$object

-

$that

-

Где вызывается хук

return apply_filters( 'woocommerce_email_headers', $header, $this->id, $this->object, $this );

return apply_filters( 'woocommerce_email_headers', $header, $this->id, $this->object, $this );

apply_filters( 'woocommerce_email_headers', '', 'low_stock', $product, null ),

apply_filters( 'woocommerce_email_headers', '', 'no_stock', $product, null ),

apply_filters( 'woocommerce_email_headers', '', 'backorder', $args, null ),

Где используется хук в WooCommerce