PHP封装的数据库保存session功能类

本文实例讲述了PHP封装的数据库保存session功能类。分享给大家供大家参考，具体如下：

PHP用数据库保存session类：

    <?php
    class SafeSessionHandler implements SessionHandlerInterface {
      public $save_path;
      public $session_name;
      public $table;
      public function __construct() {
        $this->table = new Table("safe_session");
      }
      private function session_id_parse($session_id) {
        $time = hexdec(substr($session_id, 0, 8));
        $skey = substr($session_id, 8);
        return array($time, $skey);
      }
      public function close() {
        loginfo("close: ");
        return true;
      }
      public function create_sid() {
        loginfo("create_sid: ");
        $time = time();
        $skey = "";
        $char = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        for ($i=0; $i<52; $i++) {
          $skey .= $char{mt_rand(0, 61)};
        }
        $session = array(
          "time" => $time,
          "skey" => $skey,
          "sval" => "",
        );
        $this->table->insert($session);
        return dechex($time) . $skey;
      }
      public function destroy($session_id) {
        loginfo("destroy: %s", $session_id);
        list($time, $skey) = $this->session_id_parse($session_id);
        $this->table->where("time = ?", $time)->where("skey = ?", $skey)->delete();
        return true;
      }
      public function gc($maxlifetime) {
        loginfo("gc: %s", $maxlifetime);
        $this->table->where("time < ?", time() - 86400 * 30)->delete();
        return true;
      }
      public function open($save_path, $session_name) {
        loginfo("open: %s, %s", $save_path, $session_name);
        $this->save_path = $save_path;
        $this->session_name = $session_name;
        return true;
      }
      public function read($session_id) {
        loginfo("read: %s", $session_id);
        list($time, $skey) = $this->session_id_parse($session_id);
        $row = $this->table->where("time = ?", $time)->where("skey = ?", $skey)->select()->fetch();
        if (empty($row)) {
          return "";
        }
        return $row["sval"];
      }
      public function write($session_id, $session_data) {
        loginfo("write: %s, %s", $session_id, $session_data);
        $session = array("sval" => $session_data,);
        list($time, $skey) = $this->session_id_parse($session_id);
        $this->table->where("time = ?", $time)->where("skey = ?", $skey)->update($session);
        return true;
      }
    }

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