Apply blocklist.de to shorewall, intended for use as a cron script

blocklist.de.php

<?php
$url = 'http://api.blocklist.de/getlast.php?time=';
$cachefile = '/tmp/blocklist.de.cache';
$cachetime = 0 + @filemtime($cachefile);
$url = $url . $cachetime;

$result = file_get_contents($url);
if (is_string($result)) {
	file_put_contents($cachefile, $result, FILE_APPEND);
	$arr = explode("\n", $result);
	foreach ($arr as $ip) {
		if(strlen($ip)) {
			echo "Blocking ${ip}\n";
			shell_exec("shorewall drop ".escapeshellarg($ip));
		}
	}
} else {
	echo "Failed to update blocklist";
}