HiR's Secure OpenBSD, Apache, MySQL and PHP Guide

Install php-mysql and mysql-server. This will install all necessary dependencies, including php, libiconv and several perl modules needed by the MySQL scripts.

$ sudo pkg_add php-mysql mysql-server
Ambiguous: choose package for php-mysql
 a       0: 
         1: php-mysql-5.2.17p16
         2: php-mysql-5.3.27
Your choice: 2
Ambiguous: choose dependency for php-mysql-5.3.27: 
 a       0: php-5.3.27
         1: php-5.3.27-ap2
Your choice: 0

REF: http://www.h-i-r.net/p/hirs-secure-openbsd-apache-mysql-and.html