<?php
function downloadUrl($url) {
	$browser = "Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5";
	$ch = curl_init($url);
	$curl_options = array(
		CURLOPT_REFERER => $url,
		CURLOPT_RETURNTRANSFER => 1,
		CURLOPT_USERAGENT  => $browser
	);
	curl_setopt_array($ch, $curl_options); 
	return curl_exec($ch); 	
}

$page = downloadUrl("http://phdcomics.com/comics.php"); 
$image = preg_match('#http://phdcomics.com/comics/archive/phd[0-9]{6}s.gif#', $page, $matches);
if(!empty($image)) {
	header('Content-type:image/gif');
	echo downloadUrl($matches[0]);
}
else {
	echo "Sorry, there has been an error.";
}
?>