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php将session会话保存到redis

关键词: php session redis session_set_save_handler

php将session会话保存到redis

`RedisSessionHandler.php`文件内容如下

```
<?php
class RedisSessionHandler
{

private $redis = null;

private $lifeTime = 1440;

public function __construct($redis)
    {
        $this->redis = $redis;
        $this->lifeTime = get_cfg_var('session.gc_maxlifetime');
        session_set_save_handler(
            array($this, 'open'),
            array($this, 'close'),
            array($this, 'read'),
            array($this, 'write'),
            array($this, 'destroy'),
            array($this, 'gc')
        );
        session_start();
        register_shutdown_function('session_write_close');
    }

private function addPrefix($session_id)
    {
        return "session_{$session_id}";
    }

public function open($save_path, $session_name)
    {
        return true;
    }

public function close()
    {
        return true;
    }

public function read($session_id)
    {
        $session_id = $this->addPrefix($session_id);
        if($this->redis->exists($session_id)){
            return $this->redis->get($session_id);
        }
        else{
            return '';
        }
    }

public function write($session_id, $session_data)
    {
        $session_id = $this->addPrefix($session_id);
        $this->redis->set($session_id, $session_data);
        $this->redis->expire($session_id, $this->lifeTime);
        return true;
    }

public function destroy($session_id)
    {
        $session_id = $this->addPrefix($session_id);
        if($this->redis->exists($session_id)){
            $this->redis->delete($session_id);
        }
        return true;
    }

public function gc($maxlifetime)
    {
        return true;
    }

public function __destruct()
    {
        session_write_close();
    }

}
?>
```

`test.php`文件内容如下

```
<?php
require_once('RedisSessionHandler.php');
$conn = new Redis();
$conn->connect('192.168.1.20', 6379, 5);
new RedisSessionHandler($conn);
$_SESSION['name'] = 'test';
echo $_SESSION['name'];
?>
```

admin
2018-04-07 18:51:02
php

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php将session会话保存到redis