From 3baf76718e9e568d39710d29be9c838f11038d5c Mon Sep 17 00:00:00 2001
From: Stanley Cheung <stanleycheung@google.com>
Date: Sun, 8 Nov 2015 18:16:58 -0800
Subject: [PATCH] php: append application user agent string at the beginning

---
 src/php/lib/Grpc/BaseStub.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/php/lib/Grpc/BaseStub.php b/src/php/lib/Grpc/BaseStub.php
index c26be607ffc..aa4de349ea7 100755
--- a/src/php/lib/Grpc/BaseStub.php
+++ b/src/php/lib/Grpc/BaseStub.php
@@ -51,6 +51,7 @@ class BaseStub
      * @param $opts array
      *  - 'update_metadata': (optional) a callback function which takes in a
      * metadata array, and returns an updated metadata array
+     *  - 'grpc.primary_user_agent': (optional) a user-agent string
      */
     public function __construct($hostname, $opts)
     {
@@ -64,7 +65,12 @@ class BaseStub
         }
         $package_config = json_decode(
             file_get_contents(dirname(__FILE__).'/../../composer.json'), true);
-        $opts['grpc.primary_user_agent'] =
+        if (!empty($opts['grpc.primary_user_agent'])) {
+            $opts['grpc.primary_user_agent'] .= ' ';
+        } else {
+            $opts['grpc.primary_user_agent'] = '';
+        }
+        $opts['grpc.primary_user_agent'] .=
             'grpc-php/'.$package_config['version'];
         $this->channel = new Channel($hostname, $opts);
     }