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标题 PHP实现session信息存储到数据库
范文
    PHP实现session信息存储到数据库，具体代码如下：
    /**
    * 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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更新时间：2025/5/20 12:32:27