Description:
------------
http_get is supposed to return false on connection timeout, but instead it returns an empty string.

Reproduce code:
---------------
if (false === ($http = http_get('http://0.0.0.0/', array('timeout' => 15, 'connecttimeout' => 15)))) {
  echo 'FALSE returned';
}
else {
  var_dump($http);
}

Expected result:
----------------
FALSE returned

Actual result:
--------------
string(0) ""