Antiblock proxy

antiblock.php

<?php
/**
 * Anti-block proxy
 * @author	Ross Masters <ross@php.net>
 * @package	antiblock
 * @version	0.1
 */

// Bail on empty/unset url
if (!isset($_GET['url']) || empty($_GET['url'])) {
    throw new Exception('No url specified.');
}

// Bail on invalid url
// @todo	Recognises partials?
if (!filter_var($_GET['url'], FILTER_VALIDATE_URL)) {
    throw new Exception('Invalid url.');
}

// Start curl handle and retrieve url
$ch = curl_init($_GET['url']);
curl_setopt($ch, CURLOPT_RETURN_TRANSFER, true);
$result = curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);

// Log request
$log = fopen('./log.txt', 'a');
fwrite($log, PHP_EOL . serialize(array('time' => time(), 'uri' => $_GET['url'], 'info' => $info)));
fclose($log);

// Output page
header('Content-type: ' . $info['content_type']);
echo $result;