GoAhead Exploit - Zmap Filter [OPEN SOURCE]

<?php
//no backdoors on this shit
$list = "poop.txt";
$port = "8081";
$output = "GoAhead-Filtered.txt";

function in_array_r($item, $array) {
    return preg_match('/"' . $item . '"/i', json_encode($array));
}
if (ini_get('safe_mode')) {
    die('Please disable PHP SafeMode! Killing script...');
} else {
    $file = file($list);
    ForEach ($file as $line) {
        $ip = $line;
        $ip = trim($ip);
        $url = 'http://' . $ip . ':' . $port;
        $ch = curl_init();
        $headers = [];
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, 1);
        // this function is called by curl for each header received
        curl_setopt($ch, CURLOPT_HEADERFUNCTION, function ($curl, $header) use (&$headers) {
            $len = strlen($header);
            $header = explode(':', $header, 2);
            if (count($header) < 2) // ignore invalid headers
            return $len;
            $name = strtolower(trim($header[0]));
            if (!array_key_exists($name, $headers)) $headers[$name] = [trim($header[1]) ];
            else $headers[$name][] = trim($header[1]);
            return $len;
        });
        $data = curl_exec($ch);
        if (in_array_r("GoAhead-Webs", $headers)) {
            echo "GoAhead Found";
            $data = $ip . ":" . $port . "";
            file_put_contents($output, $data, FILE_APPEND | LOCK_EX);
        } else {
            echo "";
        }
    }
}