PHP封装的数据库保存session功能类_PHP教程

PHP封装的数据库保存session功能类

2021-02-02 16:51dotcoo PHP教程

这篇文章主要介绍了PHP封装的数据库保存session功能类,涉及php基于SessionHandlerInterface接口实现的读取、写入、保存、销毁等常用操作方法,需要的朋友可以参考下

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;

									  }

									}