count file in a directory

[Anon]

If I want to find out how many file within a directory, how can I do it??

[Anon]

what I really want to do is:
I have a list of image files in a directory, but there quantity is unknow, and I want to get one each time randomly.

[Anon]

I did that very thing in one of my scripts here is the code:
$dir = dir("./images/headers/");
while($file = $dir->read()) {
if (($file != ".") && ($file != "..")) {
$headers[] = $file;
}
}
$dir->close();
srand((double)microtime()*1000000);
$randval = rand (0,(count($headers)-1));
printf('<img src="images/headers/%s">', $headers[$randval]);

[Anon]

This is exactly how to do it, but why not use mt_rand()?
According to the manual it's better statistically <b>and</b>
faster--a win/win proposition istm.