PHP extension for Redis Formula was removed
Last versions were
php54-redis requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder

Recent formula history

Mike McQuaid Deprecate tap.
Mike McQuaid php54-redis: use <<~EOS.
Boris Klimenko php54-redis 3.1.4
Ethan Hann php-redis 3.1.3
Maurus Cuelenaere Add revision 4 to all PHP redis formulas, as requested by @javian

Formula code at GitHub