Shell Parser

<?php

$shellArr = file("shells.txt");

$shellArr = array_unique($shellArr);
$fixedShells = array();
foreach ($shellArr as $shellStr)
{
    $shellStr = str_replace("\r", "", $shellStr);
    $shellStr = str_replace("\n", "", $shellStr);
    if (!is_numeric($shellStr))
    {
        if (!empty($shellStr))
        {
            $fixedShells[] = $shellStr;
        }
    }
}

$fh = fopen("fixed.txt", "w");

foreach ($fixedShells as $fixedShell)
{
    fwrite($fh, $fixedShell . "\r\n");
}

fclose($fh);

?>