Error when run artisan command in old projects and working fine for newly crated projects of Laravel

Getting uncertain error i.e

[![Parse error: syntax error, unexpected '=' in D:\xampp\htdocs\pilotRH\vendor\laravel\framework\src\Illuminate\Support\Arr.php on line 388][1]][1]

When I run artisan command in my old projects and then I test the same case by creating new projects of Laravel artisan command working fine there.

via Chebli Mohamed