Description:
------------
When declaring a public method in a child class, one can't reuse the name of a private method of the parent without being issued a Warning for php 7, a Strict Standards error for php 5.5 - 5.6, unless the signature is considered compatible.

Test script:
---------------
<?php

class Foo
{
    private function getName()
    {
        return 'John';
    }
}

class Bar extends Foo
{
    public function getName($extraArgument)
    {
        return $extraArgument;
    }
}

Demonstration : https://3v4l.org/SNlDO

Expected result:
----------------
The parent method is private : it can't be called from the outside and as far as the child class is concerned, it does not exist. Creating a public method with the same name is not overriding the method since methods in the parent class will still call the private method when asked to.

Actual result:
--------------
php 7.7 : Warning: Declaration of Bar::getName($extraArgument) should be compatible with Foo::getName() in /in/SNlDO on line 17

5.5.0 - 5.6.22 : Strict Standards: Declaration of Bar::getName() should be compatible with Foo::getName() in /in/SNlDO on line 17