PHP用数据库保存session

2015-12-15 17:42  698人阅读  评论 (0)

PHP用数据库保存session

<?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;
    }
}