when session stored in redis,the session destory has a bug

[feiyu-xie]

when session stored in redis , delete a wrong redis key

/**
	 * {@inheritdoc}
	 */
	public function destroy(string sessionId = null) -> boolean
	{
		var id;

		if sessionId === null {
			let id = this->getId();
		} else {
			let id = sessionId;
		}

		return this->_redis->exists(id) ? this->_redis->delete(id) : true;
	}

Details

the id should be _PHCR+prefix+id

[sergeyklay]

#12326