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

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

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

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

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

(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) Selects the default database for database queries

(PHP 5, PHP 7) Set callback function for LOAD DATA LOCAL INFILE command

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