Laravel on Window 10 using Wamp gives and error - development

Laravel on Window 10 using Wamp gives and error

I installed Laravel(5.6) on windows 10 with Wamp(3.1.). When I run the index file in Public folder in laravel to check if it is correctly installed or not using browser url, I get the following error:

Parse error: syntax error, unexpected ‘?’ in
C:wamp64wwwlaravelvendorlaravelframeworksrcIlluminateFoundationhelpers.php
on line 242.

So how can I solve this?

from Laravel Questions and Answers https://laravelquestions.com/php/laravel-on-window-10-using-wamp-gives-and-error/
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