HTTP download without curl or fopen wrappers

download.php

function download($url, $timeout=10) {
  $host;
  $path = '/';
  $port = 80;

  extract(parse_url($url));
  if (isset($query)) $path .= '?'.$query;
  $req = array(
    "GET $path HTTP/1.1",
    "Host: $host",
    "Connection: close",
    "",
    ""
  );

  $f = fsockopen($host, $port, $err, $errstr, $timeout);
  if ($err) throw new Exception($errstr);

  fwrite($f, join($req, "\r\n"));
  while (!feof($f) && ($header = fgets($f)) !== "\r\n") {
    if (preg_match('/^Location:\s*(.+)$/i', $header, $m)) {
      return download($m[1]);
    }
  }
  $body = '';
  while(!feof($f)) {
    $body .= fread($f, 4096);
  }
  fclose($f);
  return $body;
}