(PECL maxdb >= 1.0) Performs debugging operations

(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0) Returns the textual description of an error code

(PHP 5, PHP 7, PECL OCI8 >= 1.1.0) Executes a statement

(PECL mongo >=1.3.0) Lists all of the databases available.

(PECL mongo >=0.9.0) String representation of this collection

(PHP 5 < 5.4.0) Returns whether or not a previous row is available

(PECL tokyo_tyrant >= 0.1.0) Adds a condition to the query

(PHP 4, PHP 5, PHP 7) Execute a prepared statement

(PHP 5, PHP 7) Drops a database bool ibase_drop_db

(PECL tokyo_tyrant >= 0.2.0) Move to next key