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Somewhere in your code you wrote "new Choices(...)". Hopefully you assigned that to a variable, like the example does with "const example =". Call setChoiceByValue("AFG") on that variable.

If you're talking about jshjohnson/Choices then it looks like the setChoiceByValue method is what you need to use. If you aren't talking about that then a link to its website would be nice - though I do recommend reading said website for information beforehand, in case the answer is there already.

The basic features of PHP Oop are one thing. Do you feel comfortable with those things? In particular: What is a class vs an object What are class properties What is the difference between the property visibilities (public, protected, private) What are static properties What are class methods, and what visibilities can you use How do constructors work What other magic methods are useful What is inheritance What is an interface What are static methods? What syntax can you use to call a static method What are traits Once you are clear on the syntax and mechanics of php OOP, then you can read more about the way OOP is typically used. These OOP design patterns provide a way to design your code so as to get maximum value and avoid many pitfalls that exist when people first start out with OOP. Here are some resources that might help: Dependency injection articles by Fabien Potencier, founder of the Symfony framework. This is important to understand, as DI is the foundation of the most popular PHP frameworks: Symfony and Laravel, as well as any number of other projects and component libraries. http://fabien.potencier.org/what-is-dependency-injection.html Design Patterns in PHP https://phptherightway.com/pages/Design-Patterns.html More design patterns in PHP https://refactoring.guru/design-patterns/php