php模拟登陆的实现方法分析

<?php
set_time_limit(0);
require "Snoopy.class.php";
$snoopy=new Snoopy();
$snoopy->referer='https://www.jb51.net/';
$snoopy->agent="Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20100101 Firefox/22.0";
$submit_vars['email'] ='登陆账号';
$submit_vars['password'] ='登陆密码';
$url='https://www.jb51.net/test/Login.php';//登陆数据提交的URL地址
$snoopy->submit($url,$submit_vars);
$snoopy->fetch("https://www.jb51.net/");//希望获取的页面数据
echo $snoopy->results;//m.jb51.net

<?php
set_time_limit(0);
$cookie_file=tempnam('./tmp','cookie');//tmp目录需要先建立好
$ch=curl_init();
$login_url='https://www.jb51.net/PLogin.do';
$curlPost="email=登陆账号&password=登陆密码";
curl_setopt($ch,CURLOPT_URL,$login_url);
//启用时会将头文件的信息作为数据流输出
curl_setopt($ch,CURLOPT_HEADER,0); //设定是否输出页面内容
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_POST,1); //设置请求发送方式，post或get，CURLOPT_POST或CURLOPT_GET
curl_setopt($ch,CURLOPT_POSTFIELDS,$curlPost);
curl_setopt($ch,CURLOPT_COOKIEJAR,$cookie_file); //保存cookie
curl_exec($ch);
curl_close($ch);
$ch=curl_init();
$login_url2="https://www.jb51.net/";
curl_setopt($ch,CURLOPT_URL,$login_url2);
curl_setopt($ch,CURLOPT_HEADER,0);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,0);
curl_setopt($ch,CURLOPT_COOKIEFILE,$cookie_file); //读取cookie
curl_exec($ch);
curl_close($ch);