…t is PHP MongoDB Admin.
According to the MongoDB docs, "$db" is optional for document references. If absent, assume the reference is to a document in the current database. See: http://www.mongodb.org/display/DOCS/Database+References
Users may specify an array of servers in the $server variable at the top of the file. If $server is a string, or an array with a single value, it will function the same as before. But if $server contains multiple values, the user will be presented with a dropdown to switch between servers.
…D or json.