PHP封装的数据库保存session功能类

前端技术 2023/09/05 PHP

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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希望本文所述对大家PHP程序设计有所帮助。

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