I installed the grpc extension of php and can call it normally using the php command line directly

[root@localhost softEval]# php greeter_client.php

Hello world

But in the Thinkphp framework, I use the same method to call the extension function, prompt:
Class 'Grpc\ChannelCredentials' not found

Does anyone know how to call PHP extensions in the thinkphp framework?

Thank you!