[SOLVED] 500 Internal Server Error

[5kyy8lu3]

Hi.  I'm getting '500 Internal Server Error'.  I removed my .htaccess and it's still happening so I'm pretty sure it's not the problem.  I'm working on writing scripts to tell browser type and version.  I run it on my laptop and I get the 500 error.  Same thing when my buddy tries it on his computer.  When I run it on my desktop, it works fine.  Any ideas?

 

This is what the code looks like:

<?php
$browser = $_SERVER['HTTP_USER_AGENT'];

$targ = "firefox";  //this is the browser I'm looking for in the http-user_agent string

$slen = strlen($browser);
$browser = strtolower($browser); //make everything lower case for ease of searching
$pos = strpos($browser, $targ);
if ( $pos !== false )            //checks to see if firefox existed in the browser string
{
	$rest = $slen - $pos;   //how many characters to take with substr
	$sbrowser = substr($browser, $pos, $rest);  //new string of everything 'firefox' and after
	$nlen = strlen($sbrowser);
	$checker = substr($sbrowser, $i, 1);
	for ( $i = 0; $checker != " "; $i++ ) // not the most efficient method, originally had nothing the loop so it looped only to find the first space
		{
			$checker = substr($sbrowser, $i, 1);
		}
	$b_and_v = substr($sbrowser, 0, $i ); // takes firefox and the following version number out of the sbrowser string
	$b_and_v = ucfirst($b_and_v); //capitalize the first character for cosmetics
	$b_and_v = ereg_replace("[/]", " ", $b_and_v);  //remove the slash between the word firefox and the version number
	echo $b_and_v;
}
else
{
	echo 'Browser isn\'t firefox.';
}
?>

 

when run on my desktop, the browser outputs this: Firefox 3.0.5

 

when I run this on my laptop or my buddy's computer, I get the 500 Internal Server Error.  (both my laptop and his computer have the same version of firefox as my desktop so I know it's not my code as far as I can tell)

 

any ideas?

 

oh link to the page: www.kloudz.com/bid.php

 

another update: it runs fine on IE and opera on the laptop but not firefox, so maybe it is my code? i'm confused, I didnt' think it was physically possible for me to write code that would throw a 500 error

[xtopolis]

I would say the error is in your for loop.  It should probably be a while loop... however IMO your whole method is unorthodox.

[5kyy8lu3]

I would say the error is in your for loop.  It should probably be a while loop... however IMO your whole method is unorthodox.

 

 

well it was alot different from when I first uploaded it, I kept changing everything around, trying different things to try to figure out why it won't work but here's more of what it was originally like:

 

<?php
$target = "firefox";
$browser = strtolower($_SERVER['HTTP_USER_AGENT']);
$pos = strpos($browser, $target);
if ( $pos !== false )
{
	$remaind = strlen($browser) - $pos;
	$sub_browser = substr($browser, $pos, $remaind);
	$i = 0;
	while ( substr($sub_browser, $i, 1) != " " )
		{
			$i++;
		}
	$brow = ereg_replace("[/]", " ", ucfirst(substr($sub_browser, 0, $i )));
	echo $brow;
}
else
{
	echo 'Browser is not firefox.';
}
?>

 

and i know this isn't a clean method of doing this, i'll eventually change it to a function so I can call it from anywhere but I'm new to php so if you have a better way of extracting the browser and version number out of the $_SERVER['HTTP_USER_AGENT'] please fill me in

 

oh and even if the error was in my loop, I still won't understand why it works 100% on all browsers on my desktop but it only works in IE and opera (but not firefox) on my laptop (and both computers have identical versions of each browser)

 

here's a screenshot of the page working fine on my desktop:

 

but when I run it on my laptop I get the 500 Internet Server Error, this is really bugging me

[5kyy8lu3]

but when I run it on my laptop I get the 500 Internet Server Error, this is really bugging me

 

i pulled the logs, here is what I found, anyone know what this means?

 

[06/Jan/2009:00:58:03 -0500] "GET /bid.php HTTP/1.1" 200 111 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5 (.NET CLR 3.5.30729)" 76.92.233.52 - - [06/Jan/2009:00:58:04 -0500] "GET /favicon.ico HTTP/1.0" 404 161 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5 (.NET CLR 3.5.30729)"

 

UPDATE: ok so I realized that I had the code correct for pulling Firefox and the version number out but I didn't take into effect that part being at the very end of the agent string and since I used a " " space as the condition it went into an infinite loop.  added an if clause to check against $i being equal to the length of the string to break out if it is.