Question

I have next code. Why field userId is invisible in InheritUser?

class User{
    private $userId;

function User($userId){
    $this->userId = $userId;
}

    function getId(){
        return $this->userId;
    }
}

class InhreritUser extends User{
    function someFunc(){
            echo $this->userId; // nothing
    }
}

someFunc returns nothing:

$inheritUser = new InheritUser(1);
$inheritUser->someFunc();

Answer 1

That’s the point of the private keyword. If you use protected this will work.

See: http://php.net/language.oop5.visibility

Also, that code would have thrown an error, if you didn’t turn off errors in PHP (bad idea during development).