PHP wrapper to libgearman Formula was removed
Last versions were
php71-gearman requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
gearman 1.1.18 Application framework to farm out work to other machines or processes

Recent formula history

Mike McQuaid Deprecate tap.
Andreas Möller php71-gearman 2.0.3
Andreas Braun php71-gearman 2.0.1 (new formula)

Formula code at GitHub