PHP Times Out if Apache has been running for a while?

[Kryptix]

I have a really annoying problem, PHP just sits there until it times out if Apache has been running for a while. If you restart Apache it works absolutely fine! It's only when using the two functions before to encode/decode a username. I'm using the latest XAMPP on Windows Server 2003 although it also happens on my Windows XP box.

 

function encode_username($username) {
$username = strtolower($username);
$clean = '';
for($i = 0;$i < strlen($username);$i++) {
	$c = ord($username{$i});
	if($c >= 97 && $c <= 122) {
		$clean .= chr($c);
	}
	else if($c >= 48 && $c <= 57) {
		$clean .= chr($c);
	}
	else {
		$clean .= ' ';
	}
}
$clean = trim($clean);
if(strlen($clean) > 12) {
	$clean = substr($clean, 0, 12);
}
$hash = '0';
for($i = 0;$i < strlen($clean);$i++) {
	$c = ord($clean{$i});
	$hash = bcmul($hash, 37);
	if($c >= 97 && $c <= 122) {
		$hash = bcadd($hash, (1 + $c) - 97);
	}
	else if($c >= 48 && $c <= 57) {
		$hash = bcadd($hash, (27 + $c) - 48);
	}
}
return $hash;
}

 

function decode_username($hash) {
if(!$hash) {
	return 'invalid_name';
}
$username = '';
while($hash) {
	$i = bcmod($hash, 37);
	$hash = bcdiv($hash, 37);
	if($i == '0') {
		$username = ' '.$username;
	}
	else if($i < 27) {
		if(bcmod($hash, 37) == '0') {
			$username = chr(($i + 65) - 1).$username;
		}
		else {
			$username = chr(($i + 97) - 1).$username;
		}
	}
	else {
		$username = chr(($i + 48) - 27).$username;
	}
}
return $username;
}

 

Does anyone know what could be causing this? The exact code has been working fine on many other systems so it seems like a configuration problem. I really need to get this resolved but I'm baffled.

[oni-kun]

Why don't you debug the problem and create a benchmark to see how fast the functions are en/decoding? If it hangs obviously there's something wrong with the logic in it, I don't see anything on hand that would make it time out. How many usernames is it encoding?

[Kryptix]

Why don't you debug the problem and create a benchmark to see how fast the functions are en/decoding? If it hangs obviously there's something wrong with the logic in it, I don't see anything on hand that would make it time out. How many usernames is it encoding?

Just one. I've made it loop through 100,000 usernames and it encodes them all flawlessly, but if Apache has been running for a while (it varies) it randomly hangs. Sometimes it takes 3 days, other times it takes a few minutes. As I said, they work on other systems so I'm pretty sure it's a configuration problem but I don't have any idea where to start looking. I don't get how they can run perfectly 100,000 times in a row and then suddenly start timing out for no apparent reason.