index.php

<?php

$aid = $_GET['aid'];
try {
	$aid = intval($aid);
} catch (Exception $e) {
	die('aid needs to be an integer');
}
$clientstr = 'metamaster';
$clientver = 1;
$can_request = false;
if (file_exists("$aid.anime")) {
	$ctime = filectime("$aid.anime");
	$diff = date_diff(time(), $ctime);
	$can_request = $diff->d >= 1;
} else {
	$can_request = true;
}
if ($can_request) {
	$xml = file_get_contents("http://api.anidb.net:9001/httpapi?client=$clientstr&clientver=$clientver&protover=1&request=anime&aid=$aid");
	file_put_contents("$aid.anime", $xml);
	echo $xml;
} elseif (file_exists("$aid.anime")) {
	$xml = file_get_contents("$aid.anime");
	echo $xml;
} else {
	echo 'something went uhoh';
}