This section contains notes and hints specific to installing PHP on OpenBSD. 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 php, which contains the basic engine (plus fpm, gettext and iconv) and might be available in several versions to choose from. Next, take a look at the module packages, such as php-mysqli or php-imap. 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. You can also compile up PHP from source using the ports tree. However, this is only recommended for users familiar with OpenBSD. The PHP port is split into core and extensions. The extensions generate sub-packages for all of the supported PHP modules. If you find you do not want to create some of these modules, use the no_* FLAVOR. For example, to skip building the imap module, set the FLAVOR to no_imap. Apache and Nginx are no longer the default server on OpenBSD, but they can both be easily found in ports and packages. The new default server is also called 'httpd'. The default install of httpd runs inside a chroot(2) jail, which will restrict PHP scripts to accessing files under /var/www. You will therefore need to create a /var/www/tmp directory for PHP session files to be stored, or use an alternative session backend. In addition, database sockets need to be placed inside the jail or listen on the localhost interface. If you use network functions, some files from /etc such as /etc/resolv.conf and /etc/services will need to be moved into /var/www/etc. The OpenBSD PEAR package automatically installs into the correct chroot directories. The OpenBSD package for the gd extension requires Xorg to be installed. Unless already installed at base install by adding the xbase.tgz file set, this can be added at post-installation (see OpenBSD FAQ#4).