php session writes to database

config = $args; $this->maxlifetime = get_cfg_var("session.gc_maxlifetime"); session_set_save_handler( array($this, "open"), array($this, "close"), array($this, "read"), array($this, "write"), array($this, "destroy"), array($this, "gc")); } public function open() { $this->link = mysqli_connect( $this->config['host'], $this->config['user'], $this->config['password'], $this->config['database']); mysqli_set_charset($this->link, "utf8"); $sql = 'CREATE TABLE IF NOT EXISTS `%s` ( `session_id` varchar(255) NOT NULL, `session_data` text, `session_expires` char(10) NOT NULL, PRIMARY KEY (`session_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;'; $sql = sprintf($sql, $this->config['table']); mysqli_query($this->link, $sql); return true; } public function close() { return true; } public function read($session_id) { if(empty($session_id)) return null; $sql = 'SELECT `session_data` AS `data` FROM `%s` WHERE `session_id` = "%s" AND `session_expires` > "%u"'; $sql = sprintf($sql, mysqli_real_escape_string($this->link, $this->config['table']), mysqli_real_escape_string($this->link, $session_id), time()); $result = mysqli_query($this->link, $sql); $row = mysqli_fetch_assoc($result); return $row['data']; } public function write($session_id, $session_data) { if(empty($session_id)) return null; $newExpires = time() + $this->maxlifetime; $sql = 'REPLACE INTO `%s` SET `session_id` = "%s", `session_data` = "%s", `session_expires` = "%u"'; $sql = sprintf($sql, mysqli_real_escape_string($this->link, $this->config['table']), mysqli_real_escape_string($this->link, $session_id), mysqli_real_escape_string($this->link, $session_data), $newExpires); $result = mysqli_query($this->link, $sql); return mysqli_affected_rows($this->link); } public function destroy($session_id) { $sql = 'DELETE FROM `%s` WHERE `session_id` = "%s"'; $sql = sprintf($sql, mysqli_real_escape_string($this->link, $this->config['table']), mysqli_real_escape_string($this->link, $session_id)); $result = mysqli_query($this->link, $sql); return mysqli_affected_rows($this->link); } public function gc() { $sql = 'DELETE FROM `%s` WHERE `session_expires` < "%u"'; $sql = sprintf($sql, mysqli_real_escape_string($this->link, $this->config['table']), time()); $result = mysqli_query($this->link, $sql); return mysqli_affected_rows($this->link); } } class session { public static $collection = null; public static function open($clean = false, $token = false) { if($clean) ob_end_clean(); if($token) session_id($token); session_start(); self::$collection = $_SESSION; } public static function id() { $num_args = func_num_args(); if($num_args) { $args = func_get_arg(0); return session_id($args); }else{ return session_id(); } } public static function get($name) { return isset($_SESSION[$name]) ? $_SESSION[$name] : null; } public static function set($name, $value) { $_SESSION[$name] = $value; return true; } public static function delete($name) { if(!isset($_SESSION[$name])) return null; unset($_SESSION[$name]); return true; } public static function destroy() { session_destroy(); } } $config = array( "host"=> "127.0.0.1", "user"=> "root", "password"=> "123456", "database"=> "test", "charset"=> "utf8", "table"=> "user_session"); session_handler::init($config); session::open(); session::set("profile", array("id"=> 1, "user"=> "haowei", "vip-level"=> 6));