Trouble with image orientation

Hello everybody,

I have images on a website on wich i am fooling arround with a bit.
i want to make thumbs from bigger pictures, that i worked out.
but when resizing the pictures to smaller versions they tend to get displayed rotated because the orientation is set wrong.
I found below function to repair that issue and i tried to add some code to it so it will work also with other then jpg files.
the files i am currently trying to resize are all jpg btw.
I bet you all can see i am no master at php.... forgive me for that....

i hope someone can point me away from the error i am getting with below function.
i get the following error:
"Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 2988 bytes) "

The line that gives the error is

$img = imagerotate($img, $deg, 0);

function correctImageOrientation($filename, $type) {
//echo $filename; exit;
  if (function_exists('exif_read_data')) {
    $exif = exif_read_data($filename);
    //echo $exif['Orientation'].'<br>';
	//print_r($exif);
	if($exif && isset($exif['Orientation'])) {
      $orientation = $exif['Orientation'];
      if($orientation != 1){
		switch ($type) 
		{
			case IMAGETYPE_JPEG:
				$img = imagecreatefromjpeg($filename);
				break;
	
			case IMAGETYPE_GIF:
				$img = imagecreatefromgif($filename); 
				break;
	
			case IMAGETYPE_PNG:
				$img = imagecreatefrompng($filename); 
				break;
	
			case IMAGETYPE_JPG:
				$img = imagecreatefromjpeg($filename); 
				break;

			case IMAGETYPE_WBMP:
				$img = imagecreatefromwbmp($filename); 
				break;
		}

        $deg = 0;
        switch ($orientation) {
          case 3:
            $deg = 180;
            break;
          case 6:
            $deg = 270;
            break;
          case 8:
            $deg = 90;
            break;
        }
        
		//echo $img;
		//echo $deg;
		//exit;
		if ($deg) {
          $img = imagerotate($img, $deg, 0);       
        }
        // then rewrite the rotated image back to the disk as $filename
		switch ($type) 
		{
			case IMAGETYPE_JPEG:
				imagejpeg($img, $filename);
				break;
	
			case IMAGETYPE_GIF:
				imagegif($img, $filename);
				break;
	
			case IMAGETYPE_PNG:
				imagepng($img, $filename);
				break;
	
			case IMAGETYPE_JPG:
				imagepng($img, $filename);
				break;

			case IMAGETYPE_WBMP:
				image2wbmp($img, $filename);
				break;
		}
      } // if there is some rotation necessary
    } // if have the exif orientation info
  } // if function exists     
}