Q: How can we define global constants in Laravel?

A: We can define global constants in Laravel by creating a new file in the `config` directory and defining the constants as key-value pairs in an array. We can then access these constants throughout our application by using the `config()` helper function. For example, if we define a constant named `APP_NAME` in a file named `constants.php` in the `config` directory, we can access it in our application using `config('constants.APP_NAME')`.

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