Renamed isinvalidStatus to isInvalidStatus method name and added return type for gRPC (#6737)

Author: guandeng

src/Parser.php

@@ -60,7 +60,7 @@ public static function parseResponse($response, $deserialize): array
         if (! $response) {
             return ['No response', self::GRPC_ERROR_NO_RESPONSE, $response];
         }
-        if (self::isinvalidStatus($response->statusCode)) {
+        if (self::isInvalidStatus($response->statusCode)) {
             $message = $response->headers['grpc-message'] ?? 'Http status Error';
             $code = $response->headers['grpc-status'] ?? ($response->errCode ?: $response->statusCode);
             return [$message, (int) $code, $response];
@@ -127,7 +127,7 @@ private static function serializeUnpackedMessage($data): string
         return (string) $data;
     }
 
-    private static function isinvalidStatus(int $code)
+    private static function isInvalidStatus(int $code): bool
     {
         return $code !== 0 && $code !== 200 && $code !== 400;
     }