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Changing Method Visibility

suggest change 
trait HelloWorld {
    public function sayHello() {
        echo 'Hello World!';
    }
}

// Change visibility of sayHello
class MyClass1 {
    use HelloWorld { sayHello as protected; }
}

// Alias method with changed visibility
// sayHello visibility not changed
class MyClass2 {
    use HelloWorld { sayHello as private myPrivateHello; }
}

Running this example: 

(new MyClass1())->sayHello();
// Fatal error: Uncaught Error: Call to protected method MyClass1::sayHello()

(new MyClass2())->myPrivateHello();
// Fatal error: Uncaught Error: Call to private method MyClass2::myPrivateHello()

(new MyClass2())->sayHello();
// Hello World!

So be aware that in the last example in MyClass2 the original un-aliased method from trait HelloWorld stays accessible as-is.

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Traits:
* Traits
* What is a Trait
* Traits to facilitate horizontal code reuse
* Conflict Resolution
* Implementing a Singleton using Traits
* Multiple Traits Usage
* Changing Method Visibility
* Traits to keep classes clean
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