MongoCursor::valid
MongoGridFS
Mongo
PHP Manual

# The MongoEmptyObj class

## 소개

This class is used to insert an empty object into the database.

Inserting an empty array will create an array-type document, which can be used for (among other things) $push updates:

`<?php
$collection->insert(array('x' => array()));
?>`

The shell shows that an empty array is saved as an array:

    > db.collection.findOne()
    { 'x' : [] }

Inserting a MongoEmptyObj will create an object-type document:

`<?php
$collection->insert(array('x' => new MongoEmptyObj()));
?>`

The shell shows that a MongoEmptyObj is saved as an object:

    > db.collection.findOne()
    { 'x' : {} }

## 클래스 개요

MongoEmptyObj
MongoEmptyObj {
}

MongoCursor::valid
MongoGridFS
Mongo
PHP Manual