(PHP 5 >= 5.5.0, PHP 7) Starts a transaction

(PHP 5, PHP 7) Turns on or off auto-committing database modifications

(PHP 5, PHP 7) Changes the user of the specified database connection

(PHP 5, PHP 7) Returns the version of the MySQL server

(PHP 5, PHP 7) Selects the default database for database queries

(PHP 5, PHP 7) Pings a server connection, or tries to reconnect if the connection has gone down

(PHP 5 >= 5.0.5, PHP 7) Sets the default client character set

(PHP 5, PHP 7) Returns the MySQL client version as an integer

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

(PHP 5, PHP 7) Prepare an SQL statement for execution