[PHP] Problems with is_dir()

[Jay]

Hi!
I am trying to list all files and dirs in a directory. But i encountered 
some problems with is_dir() function. is_dir tells med that it all is 
files when i know for a fact that there is one dir in the directory 
("dir1"). Can someone tell me why this donīt work?:

<?php
if ($handle = opendir($_SERVER["DOCUMENT_ROOT"]."/img")) {
        while (false !== ($file = readdir($handle))) {
                if ($file != "." && $file != "..") {
                        if (is_dir($file)){
                                echo "Dir: ".$file;
                        }
                        else
                        {
                                echo "File: ".$file;
                        }
                        echo "<br />";
                }
        }
        closedir($handle);
        clearstatcache();
}
?>
Thanx in advance
J
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