(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) Returns the MySQL client version as an integer

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

(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) 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) Set callback function for LOAD DATA LOCAL INFILE command

(PHP 5 >= 5.4.0, PHP 7) Returns a list of errors from the last command executed