simple image viewer

[nubs]

i want to create a simple image viewer
using the url

imageviewer.php?a=image&b=1
to include image.jpg

and

imageviewer.php?a=image&b=2
to include image.gif

just need to know how to have the 1 to change to jpg

thanks

[jansky]

try if then else

$b=$_GET['b'];
if ($b==1) $ext=="jpg";else $ext="gif;

<img src="image.<?=$ext?>">

[nubs]

well there may be 3 4 5 ext

am i to assume
$b=$_GET['b'];
if ($b==1) $ext=="jpg";
if ($b==2) $ext=="gif";
if ($b==3) $ext=="jpeg";

[wilku]

For more extensions use switch:

switch ($_GET['b'])
{
   case 1:
      $ext = "jpg";
      break;
   case 2:
      $ext = "png";
      break;
//and so on
   case 6:
   default://if b==6 or none from the above
      $ext = "gif";
}