PHP extension for Apache Kafka (php-rdkafka) Formula was removed
Last versions were
php72-rdkafka requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
librdkafka 0.11.4 The Apache Kafka C/C++ library

Recent formula history

Mike McQuaid Deprecate tap.
Matthieu Moquet php-rdkafka 3.0.4
Andreas Braun Bump revision for php72-rdkafka
Romain Neutron php72-rdkafka 2.0.1 (new formula)

Formula code at GitHub