This method is a flexible interface for creating database refrences (see MongoDBRef).
The collection to which the database reference will point.
If an array or object is given, its _id field will be used as the reference ID. If a MongoId or scalar is given, it will be used as the reference ID.
Returns a database reference array.
If an array without an _id field was provided as the document_or_id parameter, NULL will be returned.
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 demonstrating how to programatically create a DB reference from just an id.
<?php
$id = new MongoId('47cc67093475061e3d9536d2');
$ref = $db->createDBRef('articles', $id);
?>
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