From 7123a41cb1df3e3abf1dca17851166de30639d77 Mon Sep 17 00:00:00 2001
From: Stanley Cheung <stanleycheung@google.com>
Date: Mon, 13 Jan 2020 22:25:38 -0800
Subject: [PATCH] PHP: Fix logic setting roots pem

---
 src/php/lib/Grpc/BaseStub.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/php/lib/Grpc/BaseStub.php b/src/php/lib/Grpc/BaseStub.php
index e92990f1a8b..7669ba74338 100644
--- a/src/php/lib/Grpc/BaseStub.php
+++ b/src/php/lib/Grpc/BaseStub.php
@@ -43,7 +43,8 @@ class BaseStub
      */
     public function __construct($hostname, $opts, $channel = null)
     {
-        if (!ChannelCredentials::isDefaultRootsPemSet()) {
+        if (!method_exists('ChannelCredentials', 'isDefaultRootsPemSet') ||
+            !ChannelCredentials::isDefaultRootsPemSet()) {
             $ssl_roots = file_get_contents(
                 dirname(__FILE__).'/../../../../etc/roots.pem'
             );