The PHP distribution and documentation are available from the PHP Web site. MySQL provides the mysql and mysqli extensions for the Windows operating system on http://dev.mysql.com/downloads/connector/php/ for MySQL version 4.1.16 and higher, MySQL 5.0.18, and MySQL 5.1. You can find information why you should preferably use the extensions provided by MySQL on that page. For platforms other than Windows, you should use the mysql or mysqli extensions shipped with the PHP sources. See Section 22.3, “MySQL PHP API”.