PHP がセッションをデータベースに書き込む example_PHP チュートリアル

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 -レベル"=> 6));