[grpc-io] Sending HTTP headers in calls from gRPC PHP client

[tanmad21]

I am attempting to set some HTTP headers in gRPC client call written in 
PHP. I cannot find anything specifying how to do this in PHP. From reading 
docs for other languages I have come to think that headers are specified in 
the client metadata. However, I can't find anything on how these should be 
formatted, and all the formats I try don't seem to work. Here is my code:


        $options = [
            'credentials' => $this->credentialsObject,
            'update_metadata' => function($metaData){
                $metaData['headers'] = ['Authorization' => 'Bearer ' . 
$this->token];
                return $metaData;
            }
        ];
        
        $client = new OrganizationServiceClient($this->url,$options);
        
        $r = new \Google\Protobuf\GPBEmpty();

        list($data,$status) = $client->list($r)->wait();


Any help or pointers would be appreciated. I'm been working on this for a 
few days now and feel like I've trying everything I can think of.

Thanks!

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