uploadify上传文件报http500异常

uploadify上传文件报http500错误
我上传文件成功了，但是报http 500错误

HTML code

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<link href="/public/js/uploadify/uploadify.css" rel="stylesheet" type="text/css">

<script src="/public/js/uploadify/jquery-1.4.2.min.js" type="text/javascript"></script> 

<script src="/public/js/uploadify/swfobject.js" type="text/javascript"></script> 

<script src="/public/js/uploadify/jquery.uploadify.v2.1.4.js" type="text/javascript"></script> 

<script type="text/javascript"> 

$(document).ready(function() {

  $('#Filedata').uploadify({

        'uploader'  : '/public/js/uploadify/uploadify.swf',

        'script'    : 'http://www.***.com/index.php/blog/article_post',

        'cancelImg' : '/public/js/uploadify/cancel.png',

    'queueID' : 'fileQueue',//与下面的上传文件列表id对应

    

    'fileDesc' : '图片文件',//上传文件类型说明  

    'fileExt' :'*.txt;*.doc;*.pdf', //扩展名，启用本项时需同时声明fileDesc  

    'method' : 'get',//如果向后台传输数据，必须是get  

                 //    'sizeLimit':1000000,//文件上传的大小限制，单位是字节  

    'auto' : true,//是否自动上传  

    'multi' : false,//是否允许同时上传多文件，可设定true或false。  

    'height' : 31,  

    'width' : 90,   

    'simUploadLimit' : 1,// 同时上传文件的数量，设置了这个参数后，那么你会因设置multi:true和queueSizeLimit：8而可以多选8个文件，但如果一旦你将 simUploadLimit也设置了，那么只会上传这个参数指定的文件个数，其它就上传不了  

                 //'buttonText' : 'shangchuan',//浏览按钮图片  

    'removeCompleted': false,

        'folder'    : '/static/',    

    'buttonImg': '/public/js/uploadify/imgfile.jpg', 

        'onError' : function(event, queueID, fileObj,errorObj){

              alert("文件:" + fileObj.name + " 上传失败:" +errorObj.type + "Error:" + errorObj.info);

         }    

  });

});

</script>

<div id="fileQueue"></div>

<input id="Filedata" name="Filedata" type="file"> 

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PHP code

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$tempFile = $_FILES['Filedata']['tmp_name'];
$targetPath = $_SERVER['DOCUMENT_ROOT'].$_REQUEST['folder'] . '/';
$ext = pathinfo($_FILES['Filedata']['name']);
$ext = $ext['extension'];
if ($ext=='doc'||$ext=='pdf'||$ext=='txt') 
{
    $name = md5(uniqid(rand().microtime())).'.'.$ext;
    $targetFile =  str_replace('//','/',$targetPath) . $name;
}
move_uploaded_file($tempFile,iconv('utf-8','gbk', $targetFile));//这里已经执行了
$path =  str_replace($_SERVER['DOCUMENT_ROOT'],'',$targetFile);
$param = array(
         'name' => $name,
         'path' => $path
        );
$data = Http::connect(CURL_HOST, CURL_PORT)->doPost(EN_SITEURL.'open.php/blog/logatt',$param, 'json');

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