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-rwxr-xr-xsrc/php/lib/Grpc/BaseStub.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/php/lib/Grpc/BaseStub.php b/src/php/lib/Grpc/BaseStub.php
index f61b8e9c3d..0a3e1f78bf 100755
--- a/src/php/lib/Grpc/BaseStub.php
+++ b/src/php/lib/Grpc/BaseStub.php
@@ -165,7 +165,7 @@ class BaseStub {
if (!preg_match('/^[A-Za-z\d_-]+$/', $key)) {
throw new \InvalidArgumentException(
'Metadata keys must be nonempty strings containing only '.
- 'alphanumeric characters and hyphens');
+ 'alphanumeric characters, hyphens and underscores');
}
$metadata_copy[strtolower($key)] = $value;
}