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

(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) Changes the user of the specified database connection

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

(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 version of the MySQL server

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

(PHP 5, PHP 7) Asks the server to kill a MySQL thread