(PECL mongo >= 0.9.0)
MongoDBRef::isRef — Checks if an array is a database reference
This not actually follow the reference, so it does not determine if it is
broken or not. It merely checks that ref
is in valid
database reference format (in that it is an object or array with $ref and $id
fields).
ref
Array or object to check.
Returns if ref
is a reference.