登录后通过php curl程序处理网页

我无法将值发布到字段并处理下载文件的进一步步骤。有人能告诉我哪里出了问题吗

    extract($_POST);  
      $url=header("Location: http://gis.lntecc.com/bwssblnt/Scada.aspx?   field1=Kathriguppe%2cSW2DM0402%2c235505H073%2c450");
   $fields =array(
            "TextBoxFromDate" => urlencode("2014-10-01"),
            "TextBoxToDate" =>  urlencode("2014-10-09")  
           );

    foreach($fields as $key => $value) 

    $fields_string .= $key.'='.$value.'&';

    rtrim($fields, '&');

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, count($fields));
    curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    $result = curl_exec($ch);
    echo $result;
    curl_close($ch);

---

我在哪里犯了错误，因为我无法将值发布到字段？

只需删除URL中的巨大空间即可：

 $url=header("Location: http://gis.lntecc.com/bwssblnt/Scada.aspx?   field1=Kathriguppe%2cSW2DM0402%2c235505H073%2c450");

变成：

 $url=header("Location: http://gis.lntecc.com/bwssblnt/Scada.aspx?field1=Kathriguppe%2cSW2DM0402%2c235505H073%2c450");