Gömma bildlänkar i PHP?

$ext = $_REQUEST["type"]; 

$filename = $_REQUEST["fl"];

/* $img is the directory where all your images are stored */

$img = "images/"; 

/* Firstly let's see if the variables have information in them */

if (!$ext) {

 echo "Could not find appropiate information";

exit;

} 

if (!$filename) {

  echo "Could not find appropiate information";

exit;

}

if (!$img) {

   echo "Could not find appropiate information";

exit;

}

/* Extensions should be shown as numbers in the url for good protection. We will now redefine $ext
matching the appropiate number from requested variable "type" */

if ($ext == 1) {

 $ext = "jpg";

} else if ($ext == 2) {

 $ext = "gif";

} else if ($ext == 3) {

 $ext = "png";

}

/* The filename is not shown as numbers so we now have the "ingredients" needed to show the image.
Now lets see if the image exists */

if (!file_exists($img . $filename . "." . $ext)) {

  echo "Could not find image";

exit;

}

/* Now lets show the image. This is just a simple include statement */

include $img . $filename . "." . $ext;

<img src="/img.php?fl=filename&type=1" alt="Image">