Simple php cacheing proxy for url2png.com

proxy.php

<?php


	function url2png_v6($url, $args) {

	  # Get your apikey from http://url2png.com/plans
	  $URL2PNG_APIKEY = "PXXXX";
	  $URL2PNG_SECRET = "SXXXX";

	  # urlencode request target
	  $options['url'] = urlencode($url);

	  $options += $args;

	  # create the query string based on the options
	  foreach($options as $key => $value) { $_parts[] = "$key=$value"; }

	  # create a token from the ENTIRE query string
	  $query_string = implode("&", $_parts);
	  $TOKEN = md5($query_string . $URL2PNG_SECRET);

	  return "http://beta.url2png.com/v6/$URL2PNG_APIKEY/$TOKEN/png/?$query_string";

	}

	$options['force']     = 'false';      				# [false,always,timestamp] Default: false
	$options['fullpage']  = 'false';      				# [true,false] Default: false
	$options['thumbnail_max_width'] = 'false';    # scaled image width in pixels; Default no-scaling.
	$options['viewport']  = "1280x1024";  				# Max 5000x5000; Default 1280x1024

	$url = (isset($_GET['url'])) ? $_GET['url'] : "http://www.google.com";
	$src = url2png_v6($url, $options);
	$thumbnail_id = md5($src);



	if(file_exists("/var/www/thumbnails/$thumbnail_id.png") {
		header("location: /thumbnails/$thumbnail_id.png");

	} else {
		$png_data = @file_get_contents($src);

		$error = true;
		foreach($http_response_header as $header) {
			$error = ($header == "X-Status: OK" or $header == "X-Error: false") ? false : $error;
		}

		if ($error === true) {
			// echo "oops!\n\n";
			// print_r($http_response_header);
			header("location: /thumbnails/oops.png");
		} else {
			// echo "yay!";
			@file_put_contents("/var/www/thumbnails/$thumbnail_id.png", $png_data, LOCK_EX);
			header("location: /thumbnails/$thumbnail_id.png");
		}
	}