One other thing, php does work, this is a roundcube specific error. here is the relevant part of my info.php file:

Jun 30 2018 16:37:36

Configure Command './configure' '--with-layout=GNU' '--with-config-file-scan-dir=/usr/local/etc/php' '--disable-all' '--enable-libxml' '--enable-mysqlnd' '--with-libxml-dir=/usr/local' '--with-pcre-regex=/usr/local' '--with-zlib-dir=/usr' '--program-prefix=' '--enable-fpm' '--with-fpm-user=www' '--with-fpm-group=www' '--enable-embed' '--with-regex=php' '--with-zend-vm=CALL' '--prefix=/usr/local' '--localstatedir=/var' '--mandir=/usr/local/man' '--infodir=/usr/local/info/' '--build=i386-portbld-freebsd11.1' 'build_alias=i386-portbld-freebsd11.1' 'CC=cc' 'CFLAGS=-O2 '-pipe' '-fstack-protector' '-fno-strict-aliasing'' 'LDFLAGS= '-fstack-protector'' 'LIBS=-lpthread' 'CPPFLAGS=' 'CPP=cpp' 'CXX=c++' 'CXXFLAGS=-O2 '-pipe' '-fstack-protector' '-fno-strict-aliasing'

Server API FPM/FastCGI

Virtual Directory Support disabled Configuration File (php.ini) Path /usr/local/etc Loaded Configuration File /usr/local/etc/php.ini

Scan this dir for additional .ini files /usr/local/etc/php Additional .ini files parsed /usr/local/etc/php/ext-10-opcache.ini, /usr/local/etc/php/ext-18-session.ini, /usr/local/etc/php/ext-20-bcmath.ini, /usr/local/etc/php/ext-20-calendar.ini, /usr/local/etc/php/ext-20-ctype.ini, /usr/local/etc/php/ext-20-curl.ini, /usr/local/etc/php/ext-20-dom.ini, /usr/local/etc/php/ext-20-filter.ini, /usr/local/etc/php/ext-20-ftp.ini, /usr/local/etc/php/ext-20-gettext.ini, /usr/local/etc/php/ext-20-gmp.ini, /usr/local/etc/php/ext-20-hash.ini, /usr/local/etc/php/ext-20-iconv.ini, /usr/local/etc/php/ext-20-imap.ini, /usr/local/etc/php/ext-20-json.ini, /usr/local/etc/php/ext-20-ldap.ini, /usr/local/etc/php/ext-20-mcrypt.ini, /usr/local/etc/php/ext-20-mysqli.ini, /usr/local/etc/php/ext-20-openssl.ini, /usr/local/etc/php/ext-20-pdo.ini, /usr/local/etc/php/ext-20-posix.ini, /usr/local/etc/php/ext-20-pspell.ini, /usr/local/etc/php/ext-20-readline.ini, /usr/local/etc/php/ext-20-simplexml.ini, /usr/local/etc/php/ext-20-sqlite3.ini, /usr/local/etc/php/ext-20-tokenizer.ini, /usr/local/etc/php/ext-20-xml.ini, /usr/local/etc/php/ext-20-xmlwriter.ini, /usr/local/etc/php/ext-30-pdo_sqlite.ini, /usr/local/etc/php/ext-30-phar.ini, /usr/local/etc/php/ext-30-xmlreader.ini

PHP API 20131106 PHP Extension 20131226 Zend Extension 220131226 Zend Extension Build API220131226,NTS PHP Extension Build API20131226,NTS Debug Build no Thread Safety disabled Zend Signal Handling disabled Zend Memory Manager enabled Zend Multibyte Support disabled IPv6 Support enabled DTrace Support disabled

Registered PHP Streamsphp, file, glob, data, http, ftp, https, ftps, phar Registered Stream Socket Transportstcp, udp, unix, udg, ssl, sslv3, tls, tlsv1.0, tlsv1.1, tlsv1.2 Registered Stream Filtersstring.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, convert.iconv.*, mcrypt.*, mdecrypt.*