system/Session/Handlers/BaseHandler.php
protected function destroyCookie(): bool
	{
		return setcookie(
				$this->cookieName, null, 1, $this->cookiePath, $this->cookieDomain, $this->cookieSecure, true
		);
	}
protected function destroyCookie(): bool
	{
		return setcookie(
				$this->cookieName, null, 1, $this->cookiePath, $this->cookieDomain, $this->cookieSecure, true
		);
	}
Internal method to force removal of a cookie by the client
when session_destroy() is called.

@return boolean