Till Klampaeckel has a new post about replacing the now-missing phar port on FreeBSD installations with a custom compile work-around.

I noticed that archivers/pecl-phar vanished from the ports tree on one of my FreeBSD servers. Problem? Reasons to remove the port were: the port is unmaintained, the port was based on the outdated phar extension from pec and that phar (in pecl) contains open security issues. The simple solution is to create a new port which of course will use the phar which is bundled in PHP's core.

He includes the simple five or six step process you'll need to follow to compile your own phar extension for your installation - grabbing the latest source, compiling (configure/make) and putting the resulting shared object (.so) in the right place for PHP to find it. All that's left then is to enable it in the php.ini. Phar is an archive creation tool that (normally) comes bundled with versions of PHP and can be used to both read and write to compressed packages.