(PECL mongo >=1.6.0) Returns information about collections in this database

(PECL mongo >=1.5.0) Creates an index on the specified field(s) if it does not already exist.

(PECL mongo >=0.9.0) Connects with a database server

(PECL mongo >=1.5.0) Execute an aggregation pipeline command and retrieve results through a cursor

(PECL mongo >=0.9.0) Drops this collection

(PECL mongo >= 1.0.8) Gets the hostname being used for this machine's ids

(PECL mongo >=1.0.1) Serializes a PHP variable into a BSON string

(PECL mongo >= 0.8.1) Creates a new regular expression

(PECL mongo >=0.9.0) Writes this file to the filesystem

(PECL mongo >=0.9.5) Check if there was an error on the most recent db operation performed