Full-stack PHP framework Formula was removed
Last versions were
php71-phalcon requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
pcre 8.42 Perl compatible regular expressions library

Recent formula history

Mike McQuaid Deprecate tap.
Laoliu php-phalcon 3.3.0
Miguel Nunes phalcon 3.2.4
Paul Scarrone php-phalcon: update to 3.2.2
Ben Casey Update phpxx-phalcon to Phalcon 3.2

Formula code at GitHub