PHP class that writes session to database-PHP Tutorial-php.cn

PHP class that writes session to database

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Release： 2016-07-25 08:54:11

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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($this, "close"),
array($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));

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