is_dir() question

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i have the code below
**
*if ($dir = @opendir("dir2open"))
{
while($file = readdir($dir)) {
//if (($file!='.') && ($file!='..') && ($file!='.htaccess') && ($file!='
index.php')) {
// if (is_dir($file)) { // print just "." & ".."
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
// if (is_file($file)) { // works fine
if (!is_file($file) & ($file!='.') && ($file!='..') ) { // works fine (print
dir)

print $file."<br>";
}
}
}

closedir($dir);
*
the problem is that, function is_dir() returns true only for "." and ".."
is_file works fine, and I used !is_file() but ..... the question is: what is
wrong here?
 i use php4, but i don't think is a bug

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