(PHP 5, PHP 7) Closes a previously opened database connection

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Get error message associated with result

(PHP 5 >= 5.3.0, PHP 7) Executes an SQL query

(PECL mongo >=1.3.3) Set the read preference for this query

(PECL ibm_db2 >= 1.0.0) Executes an SQL statement directly

(PHP 5, PHP 7) Returns the SQLSTATE error from previous MySQL operation

(PHP 5.3.2, PHP 7, PECL OCI8 >= 1.4.0) Sets the action name

(PECL ibm_db2 >= 1.0.0) Returns a result set listing the unique row identifier columns for a table

(PECL mongo >= 1.0.1) Creates a new timestamp.