who is developing PHP database extensions such as PDO, mysql, mysqli?

Question

Are these extensions provided by the respective RDBMS teams or are they developed by PHP community?

Thanks:)

Answer 1

They are developed by the PHP development team.

HOWEVER, these database extensions are made possible by the RDBMS vendors and by the native API they develop. The extensions are simply making use of the API RDBMS vendors made available to them.

For example, PDO_mysql, mysql and mysqli all interface with libmysql or mysqlnd, maintained by the MySQL development team.

Answer 2

They are developed by the PHP development team.