Extend Traits with Classes in PHP?

Question

Why we are not allowed to extend Traits with Classes in PHP?

For example:

Trait T { }

Class C use T {}
/*          


        

Answer 1

You can extend traits somewhat. Expanding on mrlee's answer, when you use a trait you can rename its methods.

Say for example you have a "parent" trait that was defined by your framework:

trait FrameworkTrait {
    public function keepMe() {
        // Framework's logic that you want to keep
    }

    public function replaceMe() {
        // Framework's logic that you need to overwrite
    }
}

Simply pull in the parent trait, rename its replaceMe method to something else, and define your own replaceMe method.

trait MyTrait {
    use FrameworkTrait {
        FrameworkTrait::replaceMe as frameworkReplaceMe;
    }

    public function replaceMe() {
        // You can even call the "parent" method if you'd like:
        $this->frameworkReplaceMe();

        // Your logic here
    }
}

And then in your class:

class MyClass {
    use MyTrait;
}

Now objects of this class can do this:

$obj = new MyClass();

$obj->keepMe();             // calls "parent" trait
$obj->replaceMe();          // calls "child" trait
$obj->frameworkReplaceMe(); // calls "parent" trait