Syntax check for operator ?? in PHP

​@mariusz_3612 as ​@Nancy OShea  mentioned, make sure the PHP version is set to PHP 7 or higher so the `??` operator is properly supported.

Paradoxically, Dreamweaver’s JavaScript parser is still a bit behind regarding some modern JS syntaxes and may incorrectly flag lines such as:
 

const rabatRzeczywisty = wynik['rabatRzeczywisty'] ?? 0;

The ?? (null coalescing) operator was introduced in PHP 7.0

Which version of PHP is selected in your DW Preferences?