PHP artisan 报错 PHP 升级问题吗？

我在win phpstudy 把PHP升级到7.2.1 phpinfo 显示是7.2.1 但是 php artisan make Mode 报错 网上说 PHP版本升级
错误信息如下：
PHP Parse error: syntax error, unexpected '?' in E:\www\blog\vendor\laravel\framework\src\Illuminate\Foundation\helpers.php on line 233
PHP Stack trace:
PHP 1. {main}() E:\www\blog\artisan:0
PHP 2. require() E:\www\blog\artisan:18
PHP 3. ComposerAutoloaderInitf1b38c2bdf82c88dc6508833cbfc495a::getLoader() E:\www\blog\vendor\autoload.php:7
PHP 4. composerRequiref1b38c2bdf82c88dc6508833cbfc495a() E:\www\blog\vendor\composer\autoload_real.php:56