(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) Turns on or off auto-committing database modifications

(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 >= 5.5.0, PHP 7) Starts a transaction

(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) Prepare an SQL statement for execution

(PHP 5 >= 5.5.0, PHP 7) Set a named transaction savepoint