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session.class.php
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122 lines (90 loc) · 3.66 KB
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<?php
class Session {
private static $handler=null;
private static $ip=null;
private static $lifetime=null;
private static $time=null;
//初始化变量；
private static function init($handler){
self::$handler=$handler;
//$_SERVER["REMOTE_ADDR"]获取客户端路由地址；
self::$ip = !empty($_SERVER["REMOTE_ADDR"]) ? $_SERVER["REMOTE_ADDR"] : 'unknown';
//ini_get()获取配置文件变量；
self::$lifetime=ini_get('session.gc_maxlifetime');
self::$time=time();
}
static function start(PDO $pdo){
self::init($pdo);
//_CLASS_ 代表本类；
session_set_save_handler(
array(__CLASS__,"open"),
array(__CLASS__,"close"),
array(__CLASS__,"read"),
array(__CLASS__,"write"),
array(__CLASS__,"destroy"),
array(__CLASS__,"gc")
);
session_start();
}
public static function open($path, $name){
return true;
}
public static function close(){
return true;
}
public static function read($PHPSESSID){
$sql="select PHPSESSID, update_time, client_ip, data from session where PHPSESSID= ?";
$stmt=self::$handler->prepare($sql);
$stmt->execute(array($PHPSESSID));
if(!$result=$stmt->fetch(PDO::FETCH_ASSOC)){
return '';
}
if( self::$ip != $result["client_ip"]){
self::destroy($PHPSESSID);
return '';
}
if(($result["update_time"] + self::$lifetime) < self::$time ){
self::destroy($PHPSESSID);
return '';
}
return $result['data'];
}
public static function write($PHPSESSID, $data){
$sql="select PHPSESSID, update_time, client_ip, data from session where PHPSESSID= ?";
$stmt=self::$handler->prepare($sql);
$stmt->execute(array($PHPSESSID));
if($result=$stmt->fetch(PDO::FETCH_ASSOC)){
if($result['data'] != $data || self::$time > ($result['update_time']+30)){
$sql="update session set update_time = ?, data =? where PHPSESSID = ?";
$stm=self::$handler->prepare($sql);
$stm->execute(array(self::$time, $data, $PHPSESSID));
}
}else{
if(!empty($data)){
$sql="insert into session(PHPSESSID, update_time, client_ip, data) values(?,?,?,?)";
$sth=self::$handler->prepare($sql);
$sth->execute(array($PHPSESSID, self::$time, self::$ip, $data));
}
}
return true;
}
public static function destroy($PHPSESSID){
$sql="delete from session where PHPSESSID = ?";
$stmt=self::$handler->prepare($sql);
$stmt->execute(array($PHPSESSID));
return true;
}
private static function gc($lifetime){
$sql = "delete from session where update_time < ?";
$stmt=self::$handler->prepare($sql);
$stmt->execute(array(self::$time-$lifetime));
return true;
}
}
try{
$pdo=new PDO("mysql:host=localhost;dbname=myeducation", "root", "123456");
$pdo->query('set names utf8');
}catch(PDOException $e){
echo $e->getMessage();
}
Session::start($pdo);