gurl 要下载的图片地址
$rfurl 来路。如果目标图像做了防盗链设置，可以绕过。
$filename 下载图片保存的文件名，相对路径，不要用realpath
$gcookie 调整cookie 伪造的cookie
$JumpCount 跳转计数
$maxtime 最大次数
调用方法：DownImageKeep(“http://www.baidu.com/img/baidu_jgylogo2.gif”,”http://baidu.com”,”a.gif”,”",0,10);
代码如下:
<?php
function DownImageKeep($gurl, $rfurl, $filename, $gcookie="", $JumpCount=0, $maxtime=30)
{
$urlinfos = GetHostInfo($gurl);
$ghost = trim($urlinfos['host']);
if($ghost=='')
{
return FALSE;
}
$gquery = $urlinfos['query'];
if($gcookie=="" && !empty($rfurl))
{
$gcookie = RefurlCookie($rfurl);
}
$sessionQuery = "GET $gquery HTTP/1.1/r/n";
$sessionQuery .= "Host: $ghost/r/n";
$sessionQuery .= "Referer: $rfurl/r/n";
$sessionQuery .= "Accept: */*/r/n";
$sessionQuery .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)/r/n";
if($gcookie!="" && !preg_match("/[/r/n]/", $gcookie))
{
$sessionQuery .= $gcookie."/r/n";
}
$sessionQuery .= "Connection: Keep-Alive/r/n/r/n";
$errno = "";
$errstr = "";
$m_fp = fsockopen($ghost, 80, $errno, $errstr,10);
fwrite($m_fp,$sessionQuery);
$lnum = 0;
//获取详细应答头
$m_httphead = Array();
$httpstas = explode(" ",fgets($m_fp,256));
$m_httphead["http-edition"] = trim($httpstas[0]);
$m_httphead["http-state"] = trim($httpstas[1]);
while(!feof($m_fp))
{
$line = trim(fgets($m_fp,256));
if($line == "" || $lnum>100)
{
break;
}
$hkey = "";
$hvalue = "";
$v = 0;
for($i=0; $i<strlen($line); $i++)
{
if($v==1)
{
$hvalue .= $line[$i];
