<?php

class T {
public function __construct($arg)
{
$this->field = $arg;
}

private $field = "test";

}

abstract class A {
private $logger;
public function __construct()
{
//$this->logger = new T('A');
$this->logger = 'A';
}
public function check()
{
var_dump($this->logger);
}
}

class B extends A{
private $logger;
public function construct()
{
$this->logger = 'B';
parent::construct();
}

public function check()
{
    var_dump($this->logger);
    parent::check();
}

}

$b = new B;
$e = clone $b;
$e->check();

outuput with xdebug breakpoints:
/test.php:34:
string(1) "B"
PHP Notice: Undefined property: B::$logger in /mnt/bingo/lib/akamai/test.php on line 20
PHP Stack trace:
PHP 1. {main}() /mnt/bingo/lib/akamai/test.php:0
PHP 2. B->check() /mnt/bingo/lib/akamai/test.php:42
PHP 3. A->check() /mnt/bingo/lib/akamai/test.php:35
/mnt/bingo/lib/akamai/test.php:20:
NULL

output without xdebug breakpoints (xdebug can be turned on, and idea can listen connection even)
/mnt/bingo/lib/akamai/test.php:34:
string(1) "B"
/mnt/bingo/lib/akamai/test.php:20:
string(1) "A"