system/Session/Handlers/MemcachedHandler.php
public function destroy($session_id): bool
	{
		if (isset($this->memcached, $this->lockKey))
		{
			$this->memcached->delete($this->keyPrefix . $session_id);

			return $this->destroyCookie();
		}

		return false;
	}
public function destroy($session_id): bool
	{
		if (isset($this->memcached, $this->lockKey))
		{
			$this->memcached->delete($this->keyPrefix . $session_id);

			return $this->destroyCookie();
		}

		return false;
	}
Destroy

Destroys the current session.

@param string $session_id Session ID

@return boolean