php的安全字符串类

来源：互联网发布：中国建筑西北院知乎编辑：程序博客网时间：2024/06/05 18:05

写cookie的value值的时候,看了下google和baidu的cookie文件,里面的value是一长串字符.于是写了个安全字符串类来产生安全字符串.

这个是security.php

<?php/**  *  * @title  安全字符串类  * @author rainysia  * @version 1.0.0  * @copyright rainysia, 2012-07-05 18:47:13 星期四  * @package default  * @link_me   *  *  **//** *  @产生随机字符类 *  @参数: len 为自定义的字符长度 *  @使用: 实例化该类既可 *  $www = new genRandomString(); *  $www->len='40'; *  echo $www->provideRandString(); *  unset($www); */class genRandomString{public function provideRandString(){$chars = array('a','b','c','d','e','f','g','h','j','k','m','n','p','q','r','s','t','u','v','w','x','y','z','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z','_','#','@','%','&','!');$charsLen = count($chars) - 1;shuffle($chars);$grs = "";$len = "";for ($i = 0; $i < $this->len; $i++) {$grs .= $chars[mt_rand(0,$charsLen)];}return $grs;}}?>

在登录页面index.php中,我们先include '../lib/security.php';

然后在登录页面的提交按钮后,写这样一段php

<?phpif(!isset($_COOKIE['WEB_TITLE'])){$cookievalue = new genRandomString();$cookievalue->len='20';$s = $cookievalue->provideRandString();setcookie("WEB",$s,time()+10803,"/") or die ("客户端禁止cookie");}else{echo "欢迎回来";}?>

其中WEB_TITLE是在网站的配置文件config.ini.php中定义的 (define )

登录时产生一个cookie文件.里面的$value即为这个类生成的.