Php Çoklu Resim Yükleme Sonrası Siyah Thumbnail Sorunu !

<form name="rresimicerial" action="?**************" method="post" enctype="multipart/form-data"><table width="510" border="0" cellspacing="0" cellpadding="0">
                  <tr>
                    <td width="110" height="25" align="left" valign="middle"><font class="yaz">Dosya Seçiniz</font></td>
                    <td width="15" height="25" align="left" valign="middle"><font class="yaz">:</font></td>
                    <td width="260" height="25" align="left" valign="middle"><input type="file" name="file_img[]" multiple="multiple" size="20" class=""></td>
                    <td width="125" height="25" align="right" valign="middle"><input name="btn_upload" type="submit" value="Load" class="button"></td>
                  </tr>
                </table></form>

<?php 
$********    =    $_GET["*******"];
if(isset($_POST['btn_upload'])) 
{ 
    function deal_image($i) { 
        $prodcat = $_POST['pcate']; 
        $prodname = $_POST['pname']; 
        $prodec = $_POST['pdesc']; 
        $prodcode = $_POST['pcode']; 
        $prodprice = $_POST['pprice']; 
        $prodffers = $_POST['poffers']; 
        $pDate = $_POST['pdate']; 
        $*****   =    $_GET["******"];
        $filetmp = $_FILES["file_img"]["tmp_name"][$i]; 
        $filename = $_FILES["file_img"]["name"][$i]; 
        $filetype = $_FILES["file_img"]["type"][$i]; 
        $filesize = $_FILES["file_img"]["size"][$i]; 
        $fileinfo = getimagesize(filetmp); 
        $filewidth = $fileinfo[0]; 
        $fileheight = $fileinfo[1]; 
        // GETS FILE EXTENSION 
        $fileextension = pathinfo($filename, PATHINFO_EXTENSION); 
        $microtime = preg_replace('/[^A-Za-z0-9]/', "", microtime()); 
        $filepath = "resimal/hasan/".$microtime.".".$fileextension; 
        $filepath_thumb = "resimal/hasan/thumbs/".$microtime.".".$fileextension; 
        move_uploaded_file($filetmp,$filepath); 

        if($filetype == "image/jpeg") 
        { 
            $imagecreate = "imagecreatefromjpeg"; 
            $imageformat = "imagejpeg"; 
        } 
        if($filetype == "image/png") 
        { 
            $imagecreate = "imagecreatefrompng"; 
            $imageformat = "imagepng"; 
        } 
        if($filetype == "image/gif") 
        { 
            $imagecreate= "imagecreatefromgif"; 
            $imageformat = "imagegif"; 
        } 
        $new_width = "100"; 
        $new_height = "75"; 
        $image_p = imagecreatetruecolor($new_width, $new_height); 
        $image = $imagecreate($filepath); //photo folder 
        imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $filewidth, $fileheight); 
        $imageformat($image_p, $filepath_thumb);//thumb folder 
        $sql = "INSERT INTO `files` (name,*****,title) VALUES ('$filepath','$*****','$filepath_thumb')"; 
        $result = mysql_query($sql); 
    }
    foreach($_FILES["file_img"]['name'] as $id => $file) {deal_image($id);} 
} 
header("Location:?sayfalar=240************************"); 
die(); 
?>