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

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

(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) Turns on or off auto-committing database modifications

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

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

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

(PHP 5, PHP 7) Unsets user defined handler for load local infile command

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