still need this block for the example composer.json file

examples/php/composer.json

@@ -2,6 +2,12 @@
   "name": "grpc/grpc-demo",
   "description": "gRPC example for PHP",
   "minimum-stability": "dev",
+  "repositories": [
+    {
+      "type": "vcs",
+      "url": "https://github.com/stanley-cheung/Protobuf-PHP"
+    }
+  ],
   "require": {
     "grpc/grpc": "dev-release-0_13"
   }