Php list directory, show/hide files.

[ted_chou12]

Please see the code below:
sorry for taking up so much of your time, but i have one more question to ask:
<?php
$dir = ".";
$file = readdir($dh);
$time = filecdate($file,"Y-m-d");
if($dh = opendir($dir)) {
while (($file = readdir($dh)) !== false){
echo "<table border=0><td><font size=5 face=\"arial\"><b>Username:</b> <a href=\"$file\">$file</a><br></font></td><td>$time</td>"."\n";}
closedir($dh);}
?></table>
This is a list directory php script, i want to know if it is possible to both show and hide files.
ps. can you teach me to show and hide both specific files (ie. with specific filename), and general types,(eg. types of files with same file extension).
THANKS, to anyone who attempts to help me out :D

[joquius]

Please don't repost the same problem.