ajax jquery file upload + formdata

i am trying to upload image files. using following code. but getting error as

  POST http://localhost/livestock/index.php/submitFile/ajaxFile 500 (Internal Server Error) 

my javascirpt

    function upload()
{
var input = document.getElementById("images");
        var i = 0, len = input.files.length, img, reader, file; 
                for ( i; i < len; i++ ) {
            file = input.files[i];
          alert(file.name);
            if (!!file.type.match(/image.*/)) {
                if ( window.FileReader ) {
                    reader = new FileReader();
                    reader.onloadend = function (e) { 
                    showUploadedItem(e.target.result, file.fileName);
                    };
                    reader.readAsDataURL(file);
                }
                if (formdata) {
                    formdata.append("images[]", file);
                }
            }   
        }
    //alert(this.files.length);
        if (formdata) {
                      var base=document.getElementById('asdf').value;
            $.ajax({
                url: base+"/index.php/submitFile/ajaxFile",
                type: "POST",
                data: formdata,
                processData: false,
                contentType: false,
                success:function (res) { alert('upload success'+res);               //document.getElementById("response").innerHTML = res; 
                },
                                error:function (res) { alert('upload failed'+res);
                    //document.getElementById("response").innerHTML = res; 
                }

            });
        }
}

php page

 foreach ($_FILES["images"]["error"] as $key => $error) {  
                if ($error == UPLOAD_ERR_OK) {  
                    $name = $_FILES["images"]["name"][$key];  
                    move_uploaded_file( $_FILES["images"]["tmp_name"][$key], "$base/../asdf/" . $_FILES['images']['name'][$key]);  
                    $error1=$error1.'<br>'.$error;
                }  
            } 

            return true; 

if i only write return true in php file , getting response as file uploaded successfully otherwise getting error as mentioned , i think its problem with java script code formdata.append("images[]", file); new to jquery , kindly advise to solve the issue, thanks in advance.

Hi, file uploading successfully with the above code. but showing upload failed because , error_reporting(0); was not there in php script.