Laravel Parse错误：语法错误，意外'？' [重复]

This question already has an answer here:

I installed a fresh version of Laravel 5.7 on my server, and I see this error. What could be the reason?

Parse error: syntax error, unexpected '?' in /home/vagrant/Code/ya3stripe/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php on line 500

Edit: The answer is simple and listed below. I did not find any duplicate question.

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Check PHP version. Laravel 5.7 onwards required PHP 7.1.3 or later versions.