php把session写入数据库示例

代码如下:class session_handler {protected $maxlifetime = null;
protected $dbHandle = null;
public $config = null;public static function init($args) {
return new self($args);
}public function __construct($args) {$this->config = $args;
$this->maxlifetime = get_cfg_var("session.gc_maxlifetime");
session_set_save_handler(
array($this,"open"),
array($this,"close"),"read"),"write"),"destroy"),"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']),$session_id),
time());$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,$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,$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,$sql);
return mysqli_affected_rows($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));

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