Install the gRPC PHP plugin

install-grpc-php-on-mac.sh

# Install the gRPC PHP plugin on Mac
#
# See: http://www.grpc.io/docs/quickstart/php.html#install-protobuf-plugin
# Source: https://gist.github.com/johndpope/503029706ed56d5375d1e9469f0135d4

# Install build dependencies
brew install automake libtool

## Clone gRPC repo
git clone --recursive -b v1.4.x https://github.com/grpc/grpc
cd grpc

cd third_party/protobuf 
./autogen.sh
./configure CC=clang CXX=clang++
make
make install

cd ../..

make 
make grpc_php_plugin