Reading files in PHP 5.3.0

[Steve Brown <sbrown25@xxxxxxxxx>]

I've been beating my head against a wall all day and can't figure this
one out.  The code below worked perfectly in PHP5.2.4.  However, I
recently upgraded to PHP5.3.0 and this code no longer works.

The function below accepts the path to a text file containing headers
from a cUrl session (example attached).  Basically this function opens
to log file, looks for certain headers and captures some information
from that line.  When called on the attached file (or any log file for
that matter), the following is output:

array(2) {
  ["ResponseCode"]=>
  NULL
  ["ErrorMessage"]=>
  NULL
}

Which means that nothing is getting read from the file.

Now, I'm going to qualify all of this by saying I'm running OSX Snow
Leopard, so I'm fully prepared to believe that Apple fucked something
up in it, as they have done to third party packages on other occasions
in the past.  Well... to be fair, they don't usually fuck up third
party packages, rather they introduce "enhancements" to the OS that
prevents certain packages from working correctly and could care less
that they broke it.

So did anything change in PHP5.3.0 that would preclude the code below
from working?  Am I going crazy?  Or did Apple f*@# something up in
this release?

Thanks,
Steve

BEGIN CODE
==========
function parseResponseHeaders($header_file) {
	$http_found = $error_found = false;
	$http_reponse = $error_message = NULL;

	$response = array();
	$response['ResponseCode'] = NULL;
	$response['ErrorMessage'] = NULL;

	if (!is_file($header_file) || !is_readable($header_file)) {
		return $response;
	}

	$fin = fopen($header_file, 'r');
	while ($line = fgets($fin)) {
		var_dump($line);

		if (substr($line, 0, 4) == 'HTTP') {
			$line_explode = explode(' ', $line);
			$response['ResponseCode'] = preg_replace('/\D/', '', $line_explode[1]);
			if ($response['ResponseCode'] != 100) {
				$http_found = true;
			}
		}

		if (substr($line, 0, 16) == 'X-Error-Message:') {
			$line_explode = explode(' ', $line);
			array_shift($line_explode);
			$response['ErrorMessage'] = join(' ', $line_explode);
			$error_found = true;
		}
	}
	fclose($fin);

	var_dump($response);
	return $response;
}

HTTP/1.1 100 Continue

HTTP/1.1 200 OK
Date: Thu, 10 Sep 2009 20:57:43 GMT
Server: Apache/2.2.6 (Unix) mod_ssl/2.2.6  PHP/5.2.8
X-Powered-By: PHP/5.2.8
Vary: Accept-Encoding
Content-Length: 1630
Content-Type: text/html

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