PHP如何实现将session信息存储到数据库的类

小编给大家分享一下PHP如何实现将session信息存储到数据库的类，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！

具体分析如下：

SessionHandlerInterface接口是PHP内置的接口，直接实现就行了
具体可以看php手册关于session_set_save_handler函数的解释！

PHP代码如下：

/*** session信息存储到数据库的类* 表结构：* CREATE TABLE IF NOT EXISTS `sessioninfo` (*  `sid` varchar(255) NOT NULL,*  `value` text NOT NULL,*  `expiration` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,*  PRIMARY KEY (`sid`)* ) ENGINE=InnoDB DEFAULT CHARSET=utf8;*/class MySessionHandler implements SessionHandlerInterface {    /**    * @access private    * @var object 数据库连接    */    private $_dbLink;    /**    * @access private    * @var string 保存session的表名    */    Private $_sessionTable;    /**    * @access private    * @var string session名    */    private $_sessionName;    /**    * @const 过期时间    */    const SESSION_EXPIRE = 10;    public function __construct($dbLink, $sessionTable) {        if(!is_object($dbLink)) {            return false;        }        $this->_dbLink = $dbLink;        $this->_sessionTable = $sessionTable;    }    /**    * 打开    * @access public    * @param string $session_save_path 保存session的路径    * @param string $session_name session名    * @return integer    */    public function open($session_save_path, $session_name) {        $this->_sessionName = $session_name;        return 0;    }    /**    * 关闭    * @access public    * @return integer    */    public function close() {        return 0;    }    /**    * 关闭session    * @access public    * @param string $session_id session ID    * @return string    */    public function read($session_id) {        $query = "SELECT value FROM {$this->_sessionTable} WHERE sid = {$session_id} AND UNIX_TIMESTAMP(expiration) + " . self::SESSION_EXPIRE . " > UNIX_TIMESTAMP(NOW())";        $result = $this->_dbLink->query($query);        if(!isset($value) || empty($value)) {            $value = "";            return $value;        }        $this->_dbLink->query("UPDATE {$this->_sessionTable} SET expiration = CURRENT_TIMESTAMP() WHERE sid = {$session_id}");        $value = $result->fetch_array();        $result->free();        return $value['value'];    }    /**    * 写入session    * @access public    * @param string $session_id session ID    * @param string $session_data session data    * @return integer    */    public function write($session_id, $session_data) {        $query = "SELECT value FROM {$this->_sessionTable} WHERE sid = '{$session_id}' AND UNIX_TIMESTAMP(expiration) + " . self::SESSION_EXPIRE . " > UNIX_TIMESTAMP(NOW())";        $result = $this->_dbLink->query($query);        $result = $result->fetch_array();        if(!empty($result)) {            $result = $this->_dbLink->query("UPDATE {$this->_sessionTable} SET value = {$session_data} WHERE sid = {$session_id}");        }        else{            $result = $this->_dbLink->query("INSERT INTO {$this->_sessionTable} (sid, value) VALUES ('{$session_id}', '{$session_data}')");        }        if($result){            return 0;        }        else{            return 1;        }          }    /**    * 销魂session    * @access public    * @param string $session_id session ID    * @return integer    */    public function destroy($session_id) {        $result = $this->_dbLink->query("DELETE FROM {$this->_sessionTable} WHERE sid = '{$session_id}'");        if($result){            return 0;        }        else{            return 1;        }    }    /**    * 垃圾回收    * @access public    * @param string $maxlifetime session 最长生存时间    * @return integer    */    public function gc($maxlifetime) {        $result = $this->_dbLink->query("DELETE FROM {$this->_sessionTable} WHERE UNIX_TIMESTAMP(expiration) < UNIX_TIMESTAMP(NOW()) - " . self::SESSION_EXPIRE);        if($result){            return 0;        }        else{            return 1;        }    }}$dbLink = new mysqli("localhost", "root", "root", "test");$sessionTable = "sessioninfo";$handler = new MySessionHandler($dbLink, $sessionTable);session_set_save_handler($handler);session_start();$_SESSION['name'] = "test";echo $_SESSION["name"];//session_destroy();

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