OPcache improves PHP performance Formula was removed
Last version was
php55-opcache 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.
Bogdan Padalko Remove custom opcache ini config
ilovezfs php55-opcache: bottle revision to rebuild.
Andy Blyler php55-opcache: update bottle
Andy Blyler PHP 5.5.38

Formula code at GitHub