PHPMailer\PHPMailer

SMTP::noop │ public │ WP 1.0

Send an SMTP NOOP command. Used to keep keep-alives alive, doesn't actually do anything.

Метод класса: SMTP{}

Хуков нет.

Возвращает

bool.

Использование

$SMTP = new SMTP();
$SMTP->noop();

Код SMTP::noop() WP 7.1.2

wp-includes/PHPMailer/SMTP.php 
public function noop()
{
    return $this->sendCommand('NOOP', 'NOOP', 250);
}