How to install PHP GRPC extensions in Ubuntu OS

First install the below library to make compatible with pecl

sudo apt install php-dev php-pear autoconf zlib1g-dev

Now install the grpc using pecl with below command

sudo pecl install grpc

Now open your php.ini file and add the below line any where

extension=grpc.so

Now restart your web server if required.

For more details visit the below links:
GRPC Install Steps