how to create global variable in laravel 5.6 - development

how to create global variable in laravel 5.6

I want to create a global variable for my entire project in Laravel’s framework so that I can create it in a class and make it everywhere anyone can guide it?

from Laravel Questions and Answers https://laravelquestions.com/php/how-to-create-global-variable-in-laravel-5-6/
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