Since your package only provides a small Facade with methods that return strings, you can determine the minimum PHP version required by checking the minimum version required by Laravel itself. You can find this information in the Laravel documentation or in the composer.json file of the Laravel framework.
For example, if Laravel requires PHP version 8.0 or higher, you can set the minimum required PHP version for your package to 8.0 as well. This way, your package will be compatible with any Laravel application that meets the minimum PHP version requirement.
To set the minimum required PHP version for your package, you can add the following line to your composer.json file:
"require": {
"php": ">=8.0"
}
This will ensure that your package can only be installed in a Laravel application that meets the minimum PHP version requirement.