php: add call getTrailingMetadata API
diff --git a/src/php/lib/Grpc/BidiStreamingCall.php b/src/php/lib/Grpc/BidiStreamingCall.php
index bf813c1..95e51c5 100644
--- a/src/php/lib/Grpc/BidiStreamingCall.php
+++ b/src/php/lib/Grpc/BidiStreamingCall.php
@@ -112,6 +112,7 @@
             OP_RECV_STATUS_ON_CLIENT => true,
         ]);
 
+        $this->trailing_metadata = $status_event->status->metadata;
         return $status_event->status;
     }
 }