Simple Reading Bus Stop short code

ShortCodeFinder.php

$StopCode = array(0 => 'a', 1 => 'a', 2 => 'a',3 => 'a');
$ValidStops = array();
$ch = curl_init();
for($a = 0; $a < 26; $a++)
{
        for($b = 0; $b < 26; $b++)
        {
                for($c = 1; $c <  26; $c++)
                {
                        for($d = 1; $d <  26; $d++)
                        {
                                $ShortCode = 'rdg' . $StopCode[0] . $StopCode[1] . $StopCode[2] . $StopCode[3];
                                if(GetStop($ch, $ShortCode))
                                {
                                        $ValidStops[] = $ShortCode;
                                        //sleep(1);
                                        usleep(10000);
                                }
                                else
                                {
                                        //usleep(10000);
                                }
                                $StopCode[3]++;
                        }
                        $StopCode[2]++;
                        $StopCode[3] = 'a';
                }
                $StopCode[1]++;
                $StopCode[2] = 'a';
        }
        $StopCode[0]++;
        $StopCode[1] = 'a';
}

print_r($ValidStops);

function GetStop($ch, $ShortCode)
{
        //$ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "http://www.mytraveline.mobi/WebView/BusStopSearch/BusStopSearchResults/".$ShortCode);
        curl_setopt($ch, CURLOPT_HEADER,0);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $data = curl_exec($ch);

        if(stristr($data, 'There has been a problem processing your request') === FALSE)
        {
                print($ShortCode . " : Success\r\n");
                return true;
        }
        else
        {
                //print($ShortCode . " : Failed\r\n");
                return false;
        }

}