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PHP GD image upload failing

Dear all,

I have a script written for me by a member here some while ago.
I am using it on a new website and when I try to upload a large photo it is failing and comes back blank - it does not say the upload failed, simply it comes back blank (the header and footer of the website comes back but anything within the PHP does not.

For small photos it works well and uploads it to the folder.

I have tried increasing the following using a .htaccess file:
memory_limit to 100MB
post_max_size to 100MB
upload_max_filesize to 100Mb

still it did not work. the defaults are now set again and they are:
memory_limit to 24MB
post_max_size to 8MB
upload_max_filesize to 10Mb.

The code is pasted below and the php settings are here:
http://arockes.org.uk/images/user_photo_uploads/php_info.php

The uploader web page is here: http://arockes.org.uk/photo_uploader.php

PHP is something that does not make a huge amount of sense to me so if you could shed any light on this I would really appreciate it.

Kind regards,
Jack

<br />
    <?
     if($_SERVER['REQUEST_METHOD']!='POST') {
?>
  </p>
  <p>  </p>
  <form action="<? echo $_SERVER['PHP_SELF'] ?>" method="post" enctype="multipart/form-data" name="Photo Uploader" id="Photo Uploader">
  <table width="375" style="background-color: #FFFFFF;border:1px solid; border-color:#DDDDDD;" border="0" cellspacing="2" cellpadding="2">
    <tr>
      <td width="365" style="font-weight:normal; color:#000000;background-color:#FFFFFF;">Upload your car or event photos here:</td>
    </tr>
    <tr>
      <td style="text-align:left"><input name="file" type="file" size="35" /></td>
    </tr>
    <tr>
      <td style="text-align:center"><input type="submit" name="Submit" value=":.Send.:" /></td>
    </tr>
  </table>
</form>
<?
} else {
     $message = "";
     $validExtensions[] = "jpg";
     $validExtensions[] = "jpeg";
      $validExtensions[] = "gif";
      $validExtensions[] = "png";
     $sentFileSize = ceil($_FILES['file']['size']/1024);
      # this way is more accurate for the extension
     $sentFileExtension = explode(".", $_FILES['file']['name']);
      $number = count($sentFileExtension);
      $sentFileExtension = strtolower($sentFileExtension[$number-1]);
 
      if(!in_array($sentFileExtension, $validExtensions)) {
           $message = "<span style=\"color:black; font size:11px\"><br>Your photo has <span style=\"color:red\">NOT</span> been uploaded,";
           $message .= " because of an invalid file type. <br>We only accept .JPG, .GIF and .PNG files.</span>";
      } else {
           // SAVE THE FILE
           $uploaddir = 'images/user_photo_uploads/';
           if (file_exists('images/photo_uploader_count.txt')) {
                $handle = fopen('images/photo_uploader_count.txt','r+');
                $newFileNumber = fread($handle,filesize('images/photo_uploader_count.txt'))+1;
                fclose($handle);
                $handle = fopen('images/photo_uploader_count.txt','w');
                fwrite($handle,$newFileNumber.'');
                fclose($handle);
           } else {
                $handle = fopen('images/photo_uploader_count.txt','x');
                fwrite($handle,'1');
                $newFileNumber = 1;
           }
           $uploadfile = $uploaddir . basename($newFileNumber . "." . $sentFileExtension);
 
 
                $bron = $_FILES['file']['tmp_name'];
                $maxbreedte = 1024;
                }
 
                if(!empty($bron)){
                     $dimensies = getimagesize($bron);
                     $breedte = $dimensies[0];
                     $hoogte = $dimensies[1];
                     if($breedte > $maxbreedte){
                          $nieuwebreedte = $maxbreedte;
                          $deelfactor = $breedte / $maxbreedte;
                          $nieuwehoogte = $hoogte / $deelfactor;
 
                          switch ($dimensies['mime']) {
 
                          case 'image/jpeg':
 
                               $image = imagecreatefromjpeg($bron);
                               $destination = imagecreatetruecolor($nieuwebreedte, $nieuwehoogte);
                               imagecopyresampled($destination, $image, 0, 0, 0, 0, $nieuwebreedte, $nieuwehoogte, $breedte, $hoogte);
                               imagejpeg($destination, $uploadfile);
                              imagedestroy($image);
                              imagedestroy($destination);
                          break;
 
                          case 'image/gif':
 
                               $image = imagecreatefromgif($bron);
                               $destination = imagecreate($nieuwebreedte, $nieuwehoogte);
                               imagecopyresampled($destination, $image, 0, 0, 0, 0, $nieuwebreedte, $nieuwehoogte, $breedte, $hoogte);
                               imagegif($destination, $uploadfile);
                              imagedestroy($image);
                              imagedestroy($destination);
                          break;
 
                          case 'image/png':
 
                               $image = imagecreatefrompng($bron);
                               $destination = imagecreate($nieuwebreedte, $nieuwehoogte);
                               imagecopyresampled($destination, $image, 0, 0, 0, 0, $nieuwebreedte, $nieuwehoogte, $breedte, $hoogte);
                               imagepng($destination, $uploadfile);
                              imagedestroy($image);
                              imagedestroy($destination);
                          break;
                          }
                     } else {
                          $uploadfile = $uploaddir . basename($newFileNumber. "." .$sentFileExtension);
                             if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadfile)) {
                               chmod($uploadfile, 0644);
                               $message = "Your photo has been saved successfully, to upload another, click Back and repeat.<br>";
                         
                          } else {
                               $message = "There was an error uploading the file, please try again!";
                          }
                     }
                }
           if (is_file($uploadfile)) {
                $message = "<span style=\"color:black; font size:11px\"><br>Your photo has been saved successfully, to upload<br>another, click your browsers back button and repeat.<br>";
 
           } else {
                $message .= "<span style=\"color:black; font size:11px\"><br><br>Please click your browsers back button to try again.";
           }
?>
<br /><table width="500" style="background-color:#FFFFFF;border:1px solid; border-color:#DDDDDD;" border="0" cellspacing="2" cellpadding="2">
  <tr>
    <td style="font-weight:normal; color:#000000;background-color:#FFFFFF;">Photo upload result:</td>
  </tr>
  <tr>
    <td style="text-align:center"><? echo $message ?></td>
  </tr>
</table>
<?
}
?>

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