fix code style
diff --git a/src/php/lib/Grpc/UnaryCall.php b/src/php/lib/Grpc/UnaryCall.php
index e8eb648..3c1cb15 100644
--- a/src/php/lib/Grpc/UnaryCall.php
+++ b/src/php/lib/Grpc/UnaryCall.php
@@ -35,8 +35,8 @@
namespace Grpc;
/**
- * Represents an active call that sends a single message and then gets a single
- * response.
+ * Represents an active call that sends a single message and then gets a
+ * single response.
*/
class UnaryCall extends AbstractCall
{
@@ -45,10 +45,11 @@
*
* @param mixed $data The data to send
* @param array $metadata Metadata to send with the call, if applicable
- * @param array $options an array of options, possible keys:
- * 'flags' => a number
+ * (optional)
+ * @param array $options An array of options, possible keys:
+ * 'flags' => a number (optional)
*/
- public function start($data, $metadata = [], $options = [])
+ public function start($data, array $metadata = [], array $options = [])
{
$message_array = ['message' => $this->serializeMessage($data)];
if (isset($options['flags'])) {