Merge pull request #10543 from practo/php_basestub_channel_fix

PHP Fixing is_a check for Channel
diff --git a/src/php/lib/Grpc/BaseStub.php b/src/php/lib/Grpc/BaseStub.php
index ed504f8..2493449 100644
--- a/src/php/lib/Grpc/BaseStub.php
+++ b/src/php/lib/Grpc/BaseStub.php
@@ -87,7 +87,7 @@
                                  'ChannelCredentials::create methods');
         }
         if ($channel) {
-            if (!is_a($channel, 'Channel')) {
+            if (!is_a($channel, 'Grpc\Channel')) {
                 throw new \Exception('The channel argument is not a'.
                                      'Channel object');
             }