php實(shí)現(xiàn)Session存儲(chǔ)到Redis
對(duì)于大訪問(wèn)量的站點(diǎn)使用默認(rèn)的Session 并不合適,我們可以將其存入數(shù)據(jù)庫(kù)、或者使用Redis KEY-VALUE數(shù)據(jù)存儲(chǔ)方案
首先新建一個(gè)session表
CREATE TABLE `sessions` ( `sid` char(40) NOT NULL, `updatetime` int(20) NOT NULL, `data` varchar(200) NOT NULL, UNIQUE KEY `sid` (`sid`) USING HASH ) ENGINE=MEMORY DEFAULT CHARSET=utf8;
Mysql 的memory引擎采用內(nèi)存表,所有數(shù)據(jù)存儲(chǔ)在內(nèi)存,操作速度快
<?php //引入數(shù)據(jù)庫(kù)文件 include "db.php"; class MySessionHandler implements SessionHandlerInterface { private $savePath; private $sessData; public $expiretime; //設(shè)置過(guò)期時(shí)間 public $db; //數(shù)據(jù)庫(kù) public function __construct($hanlder =''){ $this->db = Database::getInstance(); //獲取數(shù)據(jù)庫(kù)實(shí)力 ///var_dump($this->db); } public function open($savePath, $sessionName) { return true; } public function close() { return true; } public function read($id) { $sql ="select * from sessions where sid ='$id'"; $result = $this->db->execute($sql); if(!empty($result)){ return $this->sessData = $result; } } //函數(shù)的參數(shù) $id -> 當(dāng)前會(huì)話ID //數(shù)據(jù)DATA -> 序列化之后的字符串 public function write($id, $data) { // echo $id; // echo $data; $now = time(); $newExp = $now+$this->expiretime; //總時(shí)間=當(dāng)前時(shí)間 + 期限時(shí)間 $sql = "select * from sessions where sid ='$id'"; $result = $this->db->getOne($sql); //var_dump($result); if($data==''||isset($data)){ $data = $this->sessData; } if($result){ //如果存在則更新 $sql ="update sessions set updatetime = '$newExp',data ='$data' where sid = '$id'"; //echo $sql; $update_data =$this->db->execute($sql); if($update_data){ return true; } }else{ //不存在則生成生成 $sql = "insert into sessions(sid,updatetime,data) values('$id','$now','$data')"; $insert_data = $this->db->execute($sql); if($insert_data){ return true; } } return false; } public function destroy($id) { //銷毀 $sql = "delete from sessions where sid="."$id"; $destory = $this->db->execute($sql); if($destory){ return true; }else{ return false; } } public function gc($sessMaxLifeTime) { $t = time(); $sql ="delete from sessions where $t - 'updatetime'>${sessMaxLifeTime}"; $data = $this->db->execute($this->tosql); if($data){ return true; }else{ return false; } return true; } }
實(shí)例化
此處 PHP 手冊(cè)可以有兩種方法
1,實(shí)現(xiàn)了SessionHandlerInterface借口的對(duì)象,自PHP5.4可以使用
2 ,直接使用 session_set_save_handler
//判斷PHP版本 if(version_compare(PHP_VERSION,5.4)==1){ session_set_save_handler($handler, true); session_start(); }else{ ini_set('session.use_trans_sid',0); ini_set('session.use_cookies',1); ini_set('session.cookie_path','/'); ini_set('session.save_handler','user'); session_module_name('user'); session_set_save_handler(array($session,"open"),array($session,"close"),array($session,"read"),array($session,"write"),array($session,"destory"),array($session,"gc")); session_start(); } $_SESSION['QQ']="QQ"; echo $_SESSION['QQ'];
數(shù)據(jù)庫(kù)代碼
<?php class Database{ static $instance; static $db; static function getInstance(){ if(self::$instance){ return self::$instance; }else{ return new Database(); } } public function __construct(){ self::$db = new PDO('mysql:host=localhost;dbname=session', 'root',''); } public function getOne($sql){ $rs =self::$db->query($sql); @$rs->setFetchMode(PDO::FETCH_ASSOC);//返回關(guān)聯(lián)數(shù)組 $result = $rs -> fetch(); return $result; } public function execute($sql){ $rs = self::$db->exec($sql); return $rs; } } //$data = Database::getInstance(); //var_dump($data);
使用REDIS 存儲(chǔ)SESSION
<?php class SessionManager{ private $redis; private $sessionSavePath; private $sessionName; private $sessionExpireTime = 30; public function __construct(){ $this->redis = new Redis(); $this->redis->connect('127.0.0.1',6379); //連接redis $retval = session_set_save_handler( array($this,"open"), array($this,"close"), array($this,"read"), array($this,"write"), array($this,"destory"), array($this,"gc") ); session_start(); } public function open($path,$name){ return true; } public function close(){ return true; } public function read($id){ $value = $this->redis->get($id); if($value){ return $value; }else{ return ""; } } public function write($id,$data){ if($this->redis->set($id,$data)){ $this->redis->expire($id,$this->sessionExpireTime); //設(shè)置過(guò)期時(shí)間 return true; } return false; } public function destory($id){ if($this->redis->delete($id)){ return true; } return false; } public function gc($maxlifetime){ return true; } //析構(gòu)函數(shù) public function __destruct(){ session_write_close(); } } $re = new SessionManager(); $_SESSION['name'] = "qq"; echo $_SESSION['name'];
以上就是詳細(xì)的介紹了php實(shí)現(xiàn)Session存儲(chǔ)到Redis的方法,希望對(duì)大家的學(xué)習(xí)有所幫助。
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