MongoDB giving weird Connection Error - php

I'm having a problem with connecting to MongoDB with PHP.
This is my code:
<?php
$server = new Mongo('localhost:27017');
$db = $server->sampleDB;
$coll = $db->sample;
?>
This produces the following error:
Fatal error: Uncaught exception 'MongoConnectionException' with message 'localhost:27017: couldn't get host info for localhost' in /var/www/example/index.php:2 Stack trace: #0 /var/www/example/index.php(2): Mongo->__construct('localhost:27017') #1 {main} thrown in /var/www/wexample/index.php on line 2

Found the problem;
Turns out for some reason Mongo was only listening on 127.0.0.1, not localhost.
So, using $server = new Mongo("mongodb://127.0.0.1:27017");, instead of $server = new Mongo("mongodb://localhost:27017"); fixed the problem :)
Thanks for your help guys,
James

Following the PHP Manual
couldn't get host info for [server]
This indicated that DNS could not
resolve the server address you gave.
This could easily be caused by a typo,
for example, "server" instead of
"$server".
As well, you might want to read the Connecting part of the MongoDB section in PHP doc
EDIT
Have you tried this ?:
$server = new Mongo("mongodb://localhost:27017");

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