php的安全字符串类

写cookie的value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

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

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 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

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.