(PHP 5, PHP 7, PECL OCI8 >= 1.1.0) Returns the Oracle Database version

(PECL paradox >= 1.4.0) Converts a date into a string.

(PHP 4 <= 4.1.0, PECL dbplus >= 0.9) Creates an empty copy of a relation with default indices

(PECL mongo >=0.9.2) Return an explanation of the query, often useful for optimization and debugging

(PHP 4, PHP 5, PHP 7) Open a PostgreSQL connection

(PECL mongo >=0.9.2) Performs an operation similar to SQL's GROUP BY command

(PECL mongo >=0.9.0) Create a new cursor public

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Fetches all rows from a result as an array

(PHP 5, PHP 7) Get MySQL client info string

(PHP 4, PHP 5, PHP 7) Gets a record from a database as an associative array