PHP extension to mongodb (a small test)_javascript skills

try {
$mongo = new Mongo("mongodb://username:password@127.0.0.1:27017/db1");
}catch(MongoConnectionException $e) {
print $e->getMessage() ;
exit;
}

$db = $mongo->blog;

$conn->close();

$user = array ('name' => 'caleng', 'city' => 'beijing');
$collection->insert($user);

$newdata = array('$set' => array(" city" => "shanghai"));
$collection->update(array("name" => "caleng"), $newdata);

$collection->remove(array('name'= >'caleng'), array("justOne" => true));

$result= $collection->findone(array("name"=>"caleng"));

// Find data whose creation time is greater than a certain time
$start = 1;
$counditionarray=array("ctime"=>array('$gt'=>1337184000));
$list_data = $this->game_handle->find($counditionarray);
$total = $this->game_handle->count($counditionarray);
$list_data->limit($count) ; //Data end position
$list_data->skip($start); //Data start position
var_dump($list_data);

$cursor = $collection->find(array(
'name' => array('$in' => array('Joe', 'Wendy'))
));

$collection->insert(array("category" => "fruit", "name" => "apple"));
$collection->insert(array(" category" => "fruit", "name" => "peach"));
$collection->insert(array("category" => "fruit", "name" => " banana"));
$collection->insert(array("category" => "veggie", "name" => "corn"));
$collection->insert(array ("category" => "veggie", "name" => "broccoli"));
$keys = array("category" => 1);
$initial = array("items " => array());
$reduce = "function (obj, prev) { prev.items.push(obj.name); }";
$g = $collection->group( $keys, $initial, $reduce);
echo json_encode($g['retval']);

[{"category":"fruit","items":["apple","peach","banana "]},{"category":"veggie","items":["corn","broccoli"]}]

array(
0 => array("category" =>"fruit", "items"=>array("apple","peach","banana")),
1 => array("category" =>"veggie", "items "=>array("corn","broccoli"))
)