Fixing is_a check for Channel

php ```is_a``` function expects fully qualified class name to validate.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/php/lib/Grpc/BaseStub.php b/src/php/lib/Grpc/BaseStub.php
index ed504f85a8..24934491b4 100644
--- a/src/php/lib/Grpc/BaseStub.php
+++ b/src/php/lib/Grpc/BaseStub.php
@@ -87,7 +87,7 @@ class BaseStub
                                  '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');
             }