Latest version: pecl install openswoole-22.0.0 | composer require openswoole/core:22.1.2

OpenSwoole GRPC client can be used to connect with GRPC services provided by either OpenSwoole GRPC servers or GRPC services implemented with other frameworks and programming languages.

You have to install OpenSwoole GRPC library with composer require openswoole/grpc to use this hook.


PHP GRPC Client Example

Generate PHP stub codes with OpenSwoole GRPC Compiler

Then you can generate PHP stub codes from the .proto and OpenSwoole GRPC Compiler.

Then implement the logic of the client in the generated PHP service files like the following Helloworld GreeterClient example:

// src/Helloworld/GreeterClient.php

namespace Helloworld;

class GreeterClient extends \OpenSwoole\GRPC\BaseStub
     * @param mixed $metadata
     * @throws \OpenSwooleGRPC\Exception\InvokeException
    public function SayHello(HelloRequest $request, $metadata = []): HelloReply
        return $this->_simpleRequest('/helloworld.Greeter/SayHello',
            ['\Helloworld\HelloReply', 'decode'],

GRPC Client side example:


use Helloworld\HelloRequest;
use OpenSwoole\Constant;
use OpenSwoole\GRPC\Client;

co::set(['log_level' => Constant::LOG_ERROR]);

co::run(function () {
    $conn    = (new Client('', 9501))->connect();
    $client  = new Helloworld\GreeterClient($conn);
    $message = new HelloRequest();
    $message->setName(str_repeat('x', 10));
    $out = $client->sayHello($message);
    echo "closed\n";

Last updated on February 8, 2023