PHP implementation session store to redis,sessionredis_php tutorial

PHP implementation session stored to Redis,sessionredis

It is not appropriate to use the default session for a site with a large number of visits, we can store it in a database, or use a Redis key-value data storage scheme
Create a new session table first

CREATE TABLE ' Sessions ' (' Sid ' char (+) NOT null, ' updatetime ' int (a) ' is not NULL, ' data ' varchar ($) NOT NULL, UNIQUE KEY ' Sid ' (' Sid ') USING HASH) engine=memory DEFAULT Charset=utf8;

The memory engine of Mysql uses the table, all the data is stored in the memory, the operation speed is fast

<?php//introduction of database files include "db.php"; class Mysessionhandler implements sessionhandlerinterface{private $savePath;  Private $sessData;  Public $expiretime;  Set expiration time public $db;           Database Public Function __construct ($hanlder = ') {$this->db = database::getinstance ();       Get database Strength///var_dump ($this->db);  Public function open ($savePath, $sessionName) {return true;  Public function Close () {return true;    The public function read ($id) {$sql = "SELECT * from sessions where sid = ' $id '";      $result = $this->db->execute ($sql);      if (!empty ($result)) {return $this->sessdata = $result;    }}//Parameters of the function $id the string public function write ($id, $data) {//Echo $id, after serialization with current session ID//data    Echo $data;    $now = time ();  $NEWEXP = $now + $this->expiretime;    Total Time = current time + term time $sql = "SELECT * from sessions where sid = ' $id '";    $result = $this->db->getone ($sql);    Var_dump ($result);if ($data = = "| |    Isset ($data)) {$data = $this->sessdata;        if ($result) {//if present update $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{//Does not exist generate build $sql = "INSERT into sessions (Sid,updatetime,data) VALUES (' $id ', ' $now ', ' $data ')";    $insert _data = $this->db->execute ($sql);        if ($insert _data) {return true;  }} return false; The Public function destroy ($ID) {//destroys $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; }}

Instantiation of

There are two ways PHP manuals can be used here
1, realize the object of Sessionhandlerinterface excuse, since PHP5.4 can use
2, direct use of Session_set_save_handler

Determine the PHP version 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 '];

Database code

<?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);//returns associative array      $result = FETCH () $rs;      return $result;    }    Public function Execute ($sql) {                      $rs = self:: $db->exec ($sql);        return $rs;             }     } $data = Database::getinstance ();//var_dump ($data);

Using Redis storage 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); Connect Redis $retval = Session_set_save_handler (Array ($this, "open"), Array ($this, "close"), Array ($this, "re      Ad "), 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, $this->sessionexpiretime);      Set expiration time return true;    } return false; } Public Function DestorY ($id) {if ($this->redis->delete ($id)) {return true;    } return false;    The Public Function gc ($MAXLIFETIME) {return true;    }//Destructors Public Function __destruct () {session_write_close (); }} $re = new SessionManager (); $_session[' name '] = "QQ"; Echo $_session[' name '];

The above is a detailed introduction of PHP implementation of the session to the Redis method, I hope that everyone's learning is helpful.

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