用PHP模拟登陆

<?php
/*
* 得到网页内容
* 参数：$host [in] string
* 主机名称（例如： www.imsorry.com.cn）
* 参数：$method [in] string
* 提交方法：POST, GET, HEAD ... 并加上相应的参数( 具体语法参见 RFC1945，RFC2068 )
* 参数：$str [in] string
* 提交的内容
* 参数：$sessid [in] string
* PHP的SESSIONID
*
* @返回 网页内容 string
*/
function GetWebContent($host, $method, $str, $sessid = '')
{
$ip = gethostbyname($host);
$fp = fsockopen($ip, 80);
if (!$fp) return;
fputs($fp, "$method ");
fputs($fp, "Host: $host ");
if (!empty($sessid))
{
fputs($fp, "Cookie: PHPSESSID=$sessid; path=/; ");
}
if ( substr(trim($method),0, 4) == "POST")
{
fputs($fp, "Content-Length: ". strlen($str) . " "); // 别忘了指定长度
}
fputs($fp, "Content-Type: application/x-www-form-urlencoded ");
if ( substr(trim($method),0, 4) == "POST")
{
fputs($fp, $str." ");
}
while(!feof($fp))
{
$response .= fgets($fp, 1024);
}
$hlen = strpos($response," "); // LINUX下是 " "
$header = substr($response, 0, $hlen);
$entity = substr($response, $hlen 4);
if ( preg_match('/PHPSESSID=([0-9a-z] );/i', $header, $matches))
{
$a['sessid'] = $matches[1];
}
if ( preg_match('/Location: ([0-9a-z_?=&#.] )/i', $header, $matches))
{
$a['location'] = $matches[1];
}
$a['content'] = $entity;
fclose($fp);

补充：Php教程,Php常用代码