How to override trait function and call it from the overridden function?

How to Override a Trait Function and Call It from the Overridden Function?

Have you ever encountered a scenario where you needed to override a trait function in your class and call it from the overridden function? 🤔 If you have, you might have run into some confusion and frustration, just like the person who asked this question. But worry not, we've got you covered! In this blog post, we'll address this common issue and provide you with easy solutions to overcome it. Let's dive in! 🏊‍♂️

Understanding the Problem

To better understand the problem, let's take a look at the code snippet provided:

trait A {
    function calc($v) {
        return $v + 1;
    }
}

class MyClass {
    use A;

    function calc($v) {
        $v++;
        return A::calc($v);
    }
}

print (new MyClass())->calc(2); // should print 4

The goal here is to call the calc function from the trait A inside the calc function of the MyClass class. However, the code above doesn't work as expected. 😕

Attempted Solutions

The person who asked the question had already tried a few different approaches, such as using self::calc($v), static::calc($v), parent::calc($v), and A::calc($v). Unfortunately, none of these methods worked. 😞

Renaming the Trait Function

One possible solution is to rename the trait function in your class. Here's how you can do it:

trait A {
    function calc($v) {
        return $v + 1;
    }
}

class MyClass {
    use A {
        calc as traitcalc;
    }

    function calc($v) {
        $v++;
        return $this->traitcalc($v);
    }
}

In this solution, we use the as keyword to alias the trait function calc to traitcalc within the MyClass class. By doing so, we can now call the trait function using $this->traitcalc($v).

Finding the Right Solution

After trying the suggested solution, you might be wondering, "Will this work in my case?" 🤔

The answer is YES! This solution will allow you to override the trait function and call it from the overridden function successfully. By aliasing the trait function and using the alias to make the call, you ensure that the correct function is executed.

Conclusion

Overriding a trait function and calling it from the overridden function might seem challenging at first, but with a little trick, it becomes a piece of 🍰! By using the as keyword to alias the trait function and calling it through the alias, you can achieve the desired behavior effortlessly.

So don't let this common issue slow you down! Try out the solution provided and let us know how it worked for you. If you have any questions or alternative approaches to share, leave a comment below! Let's help each other grow and code like rockstars! 🚀💻