The driver used in the worksheet (Mongo) is considered legacy and should be deprecated in favour of the MongoDB one as outlined in the warning on https://secure.php.net/manual/en/mongo.installation.php
A short blurb of the differences:
Unlike the mongo extension, this extension supports both PHP and HHVM and is developed atop the » libmongoc and » libbson libraries. It provides a minimal API for core driver functionality: commands, queries, writes, connection management, and BSON serialization.
The driver used in the worksheet (Mongo) is considered legacy and should be deprecated in favour of the MongoDB one as outlined in the warning on https://secure.php.net/manual/en/mongo.installation.php
A short blurb of the differences: