I have been install Mongodb v.2.6.7 with php mongo driver v.1.6.3 When I get data all it work normally but if I use where query It return empty array back to me.
<?php
$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');
// search for documents where 5 < x < 20
$rangeQuery = array('x' => array( '$gt' => 5, '$lt' => 20 ));
$cursor = $collection->find($rangeQuery);
foreach ($cursor as $doc) {
var_dump($doc);
}