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(PECL mongo >=0.9.0)
MongoDB::getDBRef — Fetches the document pointed to by a database reference
$ref 
   )
ref A database reference.
Returns the document pointed to by the reference.
Example #1 MongoDB::getDBRef() example
Example demonstrating how to get a database reference and what the expected input is.
  <?php
 $ref  = array(
    '$ref'  =>  'profiles' ,
    '$id'  => new  MongoId ( '47cc67093475061e3d9536d2' )
 );
 
  $profile  =  $db -> getDBRef ( $ref );
  ?>   See MongoDB::createDBRef() for more information about how to programatically create DB references.