Warning: Unsupported declare 'strict_types' in D:\xampp\htdocs\masterweb_android_api\vendor\kreait\firebase-tokens\src\JWT\Keys\StaticKeys.php on line 3

Parse error: syntax error, unexpected 'empty' (T_EMPTY), expecting identifier (T_STRING) in D:\xampp\htdocs\masterweb_android_api\vendor\kreait\firebase-tokens\src\JWT\Keys\StaticKeys.php on line 18