通过redis实现session共享-php

<?php
class redisSession{
/**
* 保存session的数据库表的信息
*/
private $_options = array(
'handler' => null, //数据库连接句柄
'host' => null,
'port' => null,
'lifeTime' => null,
'prefix'   => 'PHPREDIS_SESSION:'
);

/**
* 构造函数
* @param $options 设置信息数组
*/
public function __construct($options=array()){
if(!class_exists("redis", false)){
die("必须安装redis扩展");
}
if(!isset($options['lifeTime']) || $options['lifeTime'] <= 0){
$options['lifeTime'] = ini_get('session.gc_maxlifetime');
}
$this->_options = array_merge($this->_options, $options);
}

/**
* 开始使用该驱动的session
*/
public function begin(){
if($this->_options['host'] === null ||
$this->_options['port'] === null ||
$this->_options['lifeTime'] === null
){
return false;
}
//设置session处理函数
session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'read'),
array($this, 'write'),
array($this, 'destory'),
array($this, 'gc')
);
}
/**
* 自动开始回话或者session_start()开始回话后第一个调用的函数
* 类似于构造函数的作用
* @param $savePath 默认的保存路径
* @param $sessionName 默认的参数名，PHPSESSID
*/
public function open($savePath, $sessionName){
if(is_resource($this->_options['handler'])) return true;
//连接redis
$redisHandle = new Redis();
$redisHandle->connect($this->_options['host'], $this->_options['port']);
if(!$redisHandle){
return false;
}

$this->_options['handler'] = $redisHandle;
//        $this->gc(null);
return true;

}

/**
* 类似于析构函数，在write之后调用或者session_write_close()函数之后调用
*/
public function close(){
return $this->_options['handler']->close();
}

/**
* 读取session信息
* @param $sessionId 通过该Id唯一确定对应的session数据
* @return session信息/空串
*/
public function read($sessionId){
$sessionId = $this->_options['prefix'].$sessionId;
return $this->_options['handler']->get($sessionId);
}

/**
* 写入或者修改session数据
* @param $sessionId 要写入数据的session对应的id
* @param $sessionData 要写入的数据，已经序列化过了
*/
public function write($sessionId, $sessionData){
$sessionId = $this->_options['prefix'].$sessionId;
return $this->_options['handler']->setex($sessionId, $this->_options['lifeTime'], $sessionData);
}

/**
* 主动销毁session会话
* @param $sessionId 要销毁的会话的唯一id
*/
public function destory($sessionId){
$sessionId = $this->_options['prefix'].$sessionId;
//        $array = $this->print_stack_trace();
//        log::write($array);
return $this->_options['handler']->delete($sessionId) >= 1 ? true : false;
}

/**
* 清理绘画中的过期数据
* @param 有效期
*/
public function gc($lifeTime){
//获取所有sessionid，让过期的释放掉
//$this->_options['handler']->keys("*");
return true;
}
//打印堆栈信息
public function print_stack_trace()
{
$array = debug_backtrace ();
//截取用户信息
$var = $this->read(session_id());
$s = strpos($var, "index_dk_user|");
$e = strpos($var, "}authId|");
$user = substr($var,$s+14,$e-13);
$user = unserialize($user);
//print_r($array);//信息很齐全
unset ( $array [0] );
if(!empty($user)){
$traceInfo = $user['id'].'|'.$user['user_name'].'|'.$user['user_phone'].'|'.$user['presona_name'].'++++++++++++++++\n';
}else{
$traceInfo = '++++++++++++++++\n';
}
$time = date ( "y-m-d H:i:m" );
foreach ( $array as $t ) {
$traceInfo .= '[' . $time . '] ' . $t ['file'] . ' (' . $t ['line'] . ') ';
$traceInfo .= $t ['class'] . $t ['type'] . $t ['function'] . '(';
$traceInfo .= implode ( ', ', $t ['args'] );
$traceInfo .= ")\n";
}
$traceInfo .= '++++++++++++++++';
return $traceInfo;
}

}

$handler = new redisSession(array(
'host' => "127.0.0.1",
'port' => "6379"
));
$handler->begin();