(PHP 5, PHP 7) Returns the version of the MySQL protocol used

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

(PHP 5 <= 5.3.0) Refreshes public bool mysqli::refresh

(PHP 5, PHP 7) Opens a connection to a mysql server

(PHP 5 >= 5.3.0, PHP 7) Returns statistics about the client connection

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

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

(PHP 5, PHP 7) Rolls back current transaction

(PHP 5 >= 5.1.0, PHP 7) Get result of SHOW WARNINGS

(PHP 5, PHP 7) Escapes special characters in a string for use in an SQL statement, taking into account the current