Description:
------------
ok, i've written a "watcher-tool" for my /var/log/mail, which is a syslog-file (for pop-before-smtp with sendmail, but this doesn't matter). i have a never ending do-while with a sleep of 4 seconds, and i use filemtime to see if something changed in /var/log/mail. well, the problem was, the script never went through even if the file got changed (i've checked that with ls -l many times...). only if you get filemtime of another file between two filemtimes of /var/log/mail, php noticed that the file modification time changed.

well, but if you edit the file by an editor, php does notice it. first i thought, its a matter of syslog-daemon, but since i tried to use filemtime on another file between two checks of /var/log/mail, im not sure anymore...

Reproduce code:
---------------
#!/usr/local/php/bin/php
<?php
$file = "/var/log/mail";
$filemtime = filemtime($file);
do
{
	sleep(3);
	echo "not out yet!";
} while (filemtime($file) == $filemtime);
// you'll never get out, even if the log-file gets changed :)
echo "im out (but this will never happen :p)";
?>

Expected result:
----------------
Get out of do ... while as soon as sendmail/postfix/qpopper/ipopd/whatever writes something to your /var/log/mail

Actual result:
--------------
you won't get out :p