I installed it on FreeBSD 11 with few extra steps and it is working fine.
Below is what I did:
pkg install wget
pkg install perl5
pkg install bind910
cd /usr/ports/lang/php56
make install
run the directadmin setup.sh (save the login details when done)
cd /usr/local/directadmin/custombuild
./build dovecot
./build exim
./build pureftpd
./build iconv
./build php
Done.
FreeBSD is a very solid OS