Warning: Unsupported declare 'strict_types' in D:\xampp\htdocs\prdk-wb-be\vendor\sebastian\type\src\Parameter.php on line 1

Parse error: syntax error, unexpected 'readonly' (T_STRING), expecting class (T_CLASS) in D:\xampp\htdocs\prdk-wb-be\vendor\sebastian\type\src\Parameter.php on line 15