Class PHP [private vs protected and public]

[Jolied]

I don't know how to write a title in this case, but what is the question?

Watch the code:

<?php
class People
{
    private function status() {return __METHOD__;}
    public function Sleep(){
        echo $this->status().'<br />';
    }
}
class Programmer extends People
{
    private function status() {return __METHOD__;}
}
$obj = new Programmer();
$obj->Sleep();
?>

On the way out, People::status

In this example, we're changing access modes. protected (or public The result will be the same. protected)

<?php
class People
{
    protected function status() {return __METHOD__;}
    public function Sleep(){
        echo $this->status().'<br />';
    }
}
class Programmer extends People
{
    protected function status() {return __METHOD__;}
}
$obj = new Programmer();
$obj->Sleep();
?>

On the way out, Programmer::status

How does this mechanism work? I don't understand why. private He doesn't give the same result as he does. protected♪ On the website. php.net I didn't see that.

[Kadyn]

Closed (privatized) methods are available only from within class. When you create a new private method in your heir Programmer::status(), you do not redefin the parent method, but you do write a new function with the same name as the parent, but only in another area of visibility. You don't have a different method in your heir. Sleep()when you challenge:

$obj = new Programmer();
$obj->Sleep();

Programmer::Sleep() ♪ parent::Sleep()♪ A in visibility parent Method status() Defined and must return the People:status. I mean, if you'd redesign the method. Programmer::Sleep()the result would be the same as when changing access retrofits because in this case the code would call the method Sleep() from its area of visibility.

<?php
class Programmer extends People
{
    private function status() {return __METHOD__;}
    public function Sleep(){
        echo $this->status().'<br />';
    }
}

On the way out, we'll get: Programmer::status♪

Don't declare the closed methods you want to change in your heirs. Specially, there's an access modifier. protectedsuch methods will be available to the entire hierarchy of inheritance.