switch($ext)
   {
     case "dir":
    $extpic = "dir.jpg";
    break;
   
  case "html":
    $extpic = "html.jpg";
    break;
          }

   switch ($ext) {
   case "htm": case "html":
   $extpic = "htm.jpg";
   break;

$images = array(
   'dir' => 'dir.jpg',
   'html' => 'html.jpg');

$extpic = NULL;
if (isset($images[$ext]))
    $extpic = $images[$ext];

$extpic = NULL;
if (file_exists($ext . '.jpg'))
   $extpic = $ext . '.jpg';

Wie meinst du das?

case "html" || "php" || "asp":
    $extpic = "html.jpg";
    break;

<?php

$ext = "html";

switch ($ext) {
  case "htm": case "html":
  $extpic = "htm.jpg";
  break;
}

echo $extpic;
?>  

<?

function getExtImage($sFilename = "helloworld.jpg") {
   $aExtensions = array(
       "(php|htm|txt)" => "php.jpg",
       "(jpg|gif)" => "jpeg.jpg",
       "(jsp)" => "jsp.jpg"
   );
   
   foreach ($aExtensions as $sRegexp => $sImage) {
       //echo "$sRegexp -> $sImage<br>";
       if (preg_match('/'.$sRegexp.'/',$sFilename)) {
           return $sImage;
       }
   }
}

echo getExtImage("something.php") . "<br>";
echo getExtImage("something.jpg") . "<br>";
echo getExtImage("something.jsp") . "<br>";

?>

So funktioniert es bei mir.

if (preg_match('/\.'.$sRegexp.'$/',$sFilename)) {...