php實現Session儲存到Redis_php技巧

對於大訪問量的網站使用預設的Session 並不合適，我們可以將其存入資料庫、或者使用Redis KEY-VALUE資料存放區方案
首先建立一個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引擎採用記憶體表，所有資料存放區在記憶體，操作速度快

<?php//引入資料庫檔案include "db.php";class MySessionHandler implements SessionHandlerInterface{  private $savePath;  private $sessData;  public $expiretime;  //設定到期時間  public $db;  //資料庫  public function __construct($hanlder =''){         $this->db = Database::getInstance();           //擷取資料庫實力     ///var_dump($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;      }  }      //函數的參數 $id -> 當前會話ID      //資料DATA -> 序列化之後的字串  public function write($id, $data)  {    // echo $id;    // echo $data;    $now = time();    $newExp = $now+$this->expiretime;  //總時間=目前時間 + 期限時間    $sql = "select * from sessions where sid ='$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{      //不存在則產生產生  $sql = "insert into sessions(sid,updatetime,data) values('$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;  }}

執行個體化

此處 PHP 手冊可以有兩種方法
1，實現了SessionHandlerInterface借口的對象,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'];

資料庫代碼

<?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);//返回關聯陣列      $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 儲存SESSION

<?phpclass 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);  //串連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,$this->sessionExpireTime);          //設定到期時間        return true;      }      return false;    }    public function destory($id){      if($this->redis->delete($id)){        return true;      }      return false;    }    public function gc($maxlifetime){      return true;    }    //解構函式    public function __destruct(){      session_write_close();    }     } $re = new SessionManager();$_SESSION['name'] = "qq";echo $_SESSION['name'];

以上就是詳細的介紹了php實現Session儲存到Redis的方法，希望對大家的學習有所協助。