curl cookiejar 获取不到内容,该怎么解决_PHP

curl cookiejar 获取不到内容

<?php

curlImage();
function curlImage(){
    $cookieJar=tempnam('tmp', cookieImage);
    $ch=curl_init("http://124.160.104.166/(1jovmraaf1pemj55dkr01ebo)/CheckCode.aspx");
    curl_setopt($ch, CURLOPT_COOKIEJAR, $cookieJar);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $image=curl_exec($ch);
    curl_close($ch);
    $fp=fopen("image.gif", "w+");
    fwrite($fp, $image);

}

这段代码是获取验证码加上cookie得可是每次看cookieImage文件都是空得
这是为什么？[yabao=][/yabao][yabao=][/yabao]

------解决思路----------------------

print_r(get_headers('http://124.160.104.166/'));

Array
(
    [0] => HTTP/1.1 302 Found
    [1] => Connection: close
    [2] => Date: Thu, 02 Oct 2014 03:05:03 GMT
    [3] => Server: Microsoft-IIS/6.0
    [4] => X-Powered-By: ASP.NET
    [5] => X-AspNet-Version: 1.1.4322
    [6] => Location: /(mggxrgvmym2tzn45b5wfkh55)/default2.aspx
    [7] => Cache-Control: private
    [8] => Content-Type: text/html; charset=gb2312
    [9] => Content-Length: 158
    [10] => HTTP/1.1 200 OK
    [11] => Connection: close
    [12] => Date: Thu, 02 Oct 2014 03:05:04 GMT
    [13] => Server: Microsoft-IIS/6.0
    [14] => X-Powered-By: ASP.NET
    [15] => X-AspNet-Version: 1.1.4322
    [16] => Pragma: no-cache
    [17] => Cache-Control: no-cache
    [18] => Pragma: no-cache
    [19] => Expires: -1
    [20] => Content-Type: text/html; charset=gb2312
    [21] => Content-Length: 4091
)

显然跳转中的形如 (mggxrgvmym2tzn45b5wfkh55) 的路径是充当 session 的角色的
------解决思路----------------------
顶上说的对啊