在php7.1版本时readSession 当redis返回null时不是字符串报错

hkui commented 5 years ago

| Yii vesion 2.0.15 | PHP version 7.1 | Operating system centos redis:4.0.2 `/**

Session read handler.
Do not call this method directly.
@param string $id session ID
@return string the session data */ public function readSession($id) { $data = $this->redis->executeCommand('GET', [$this->calculateKey($id)]);
```
return $data === false ? '' : $data;
```
}`

$data=null时就不全等于false了，返回的是null session_start(): Failed to read session data: user (path: ) php7.1里readSession必须返回字符串

cebe commented 5 years ago

can you show a stack trace of the exception?

hkui commented 5 years ago

can you show a stack trace of the exception?

machour commented 5 years ago

Confirmed, I see this problem on the Cache component too, where getValue() returns NULL instead of false when checking for a key existence.

Redis returns "-1" when a key is not found, and this fall into this case:

yiisoft / yii2-redis