readdir prob

I have this code :

Code:

<?php
$dh=opendir('dir_name');

while(false !== ($file=readdir($dh) ) )
{
if( is_file($file) )
    echo"file";
else
    echo"dir!"
}
?>

Can you help me make it work?

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Here you are :

Code:

<?php
$dh=opendir('dir_name');

while(false !== ($file=readdir($dh) ) )
{
if( is_file('dir_name' . $file) ) //The prob was here
    echo"file";
else
    echo"dir!"
}
?>

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