Warning: Unsupported declare 'strict_types' in C:\Apache24\htdocs\drupal\vendor\guzzlehttp\promises\src\PromiseInterface.php on line 3

Parse error: syntax error, unexpected 'const' (T_CONST), expecting variable (T_VARIABLE) in C:\Apache24\htdocs\drupal\vendor\guzzlehttp\promises\src\PromiseInterface.php on line 18