Warning: Unsupported declare 'strict_types' in D:\xampp\htdocs\wsdemo\vendor\sebastian\diff\src\Differ.php on line 1

Parse error: syntax error, unexpected 'const' (T_CONST), expecting variable (T_VARIABLE) in D:\xampp\htdocs\wsdemo\vendor\sebastian\diff\src\Differ.php on line 21