Using Binary Packages
Using binary packages to install PHP on OpenBSD is the recommended and simplest method. The core package has been separated from the various modules, and each can be installed and removed independently from the others. The files you need can be found on your OpenBSD CD or on the FTP site.
The main package you need to install is php4-core-4.3.3.tgz, which contains the basic engine (plus gettext and iconv). Next, take a look at the module packages, such as php4-mysql-4.3.3.tgz or php4-imap-4.3.3.tgz. You need to use the phpxs command to activate and deactivate these modules in your php.ini.Read the packages(7) manual page for more information about binary packages on OpenBSD.



