Why won't this script recognize the parameter?

<?php
 
 
 
$COUNT_FILE = "data.txt";  // En: Absolute path and name to count data file.
 
 
 
function error ($error_message) {
 
    echo $error_message."<BR>";
 
    exit;
 
}
 
 
 
echo $QUERY_STRING."<br>";
$url = urldecode($QUERY_STRING);  //  get the passed URL
 
 
 
 
if (! file_exists($COUNT_FILE))
 
    error("Can't find data file, check '\$COUNT_FILE' var...");
 
 
 
if ((! $url) || (! preg_match("/http:/", $url)))
 
error ("The URL you passed is invalid (doesn't begin with http:)");
 
 
 
$file_arry = file($COUNT_FILE); //  read each line of data from count.txt file into array
 
 
 
//list($key, $val) = each($file_arry);
 
//echo "key=".$key."<BR>";
 
//echo "val=".$val."<BR>";
 
 
 
while (list($key, $val) = each($file_arry)) {  //  parse each line into key/value pairs
 
    if ($val != "") {  //  if URL is not blank...
 
        list($file_url, $nb) = preg_split("/\t|\n/", $val);
 
        if ($file_url == $url) {
 
           $nb += 1;
 
           $file_arry[$key] = "$file_url\t$nb\n";
 
           $find = 1;
 
        }
 
   	}
 
}
 
 
 
$file = join ("", $file_arry);
 
 
 
//if (! $find)  //  if URL wasn't found, put new URL into file
 
//   $file .= "$url\t1\n";
 
 
 
$fp = fopen("$COUNT_FILE", "w");
 
flock($fp, LOCK_EX + LOCK_NB);
 
fputs($fp, $file);
 
flock($fp, LOCK_UN);
 
fclose($fp);
 
header("Location: $url");
 
 
 
?>

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