MongoDB::createDBRef

(PECL mongo >=0.9.0)

MongoDB::createDBRef — Creates a database reference

Description

public array MongoDB::createDBRef ( string $collection , mixed $a )

This method is a flexible interface for creating database refrences (see MongoDBRef).

Parameters

collection

The collection to which the database reference will point.

a

Object or _id to which to create a reference. If an object or associative array is given, this will create a reference using the _id field.

Return Values

Returns a database reference array.

Examples

Example #1 MongoDB::createDBRef() example

Example demonstrating how to programatically create a DB reference array from a document.

<?php

$articles = $db->articles;

$article = array(
 'title' => 'Test article',
 'description' => 'Test article description'
);

$articles->insert($article);
$ref = $db->createDBRef('articles', $article);

print_r($article);
print_r($ref);
?>

The above example will output something similar to:

     Array
     (
         [title] => Test article
         [description] => Test article description
         [_id] => MongoId Object
             (
             )

     )
     Array
     (
         [$ref] => articles
         [$id] => MongoId Object
             (
             )

     )
     

Now the $ref can be stored on another document and retrieved later with MongoDB::getDBRef() or MongoCollection::getDBRef().

Example #2 MongoDB::createDBRef() example

Example demonstrating how to programatically create a DB reference from just an id.

<?php

$id = new MongoId('47cc67093475061e3d9536d2');
$ref = $db->createDBRef('articles', $id);
?>