PHP framework similar to zend framework built as PHP extension Formula was removed
Last versions were
php70-yaf 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

ilovezfs php70: migrate to homebrew/core
ilovezfs php70-yaf: bottle revision to rebuild.
Jan Viljanen php70-yaf (new formula)
Carlo Add php70-yaf
Carlo Alter php-yaf desc

Formula code at GitHub