php problem

test.php

#!/usr/bin/env php
<?php

class Dangerous {
    private $object;    
    public function __construct()
    {	
        $this->object = new \stdClass();;
    }
    public function exec() {
      	echo "dangerous";
    }     
}

class NotDangerous {
      public function exec() {
      	     echo "not dangerous";
      }
}

class SegfaultScenario
{
    private $circular_reference;
    private $object;
    
    public function __construct()
    {
        $this->circular_reference = $this;
        $this->notDangerous = new \NotDangerous();
    }

    public function __destruct()
    {
	if (!$this->notDangerous) {
	return;
        }
	$notUsed = new \Dangerous();;
        $this->notDangerous->exec();
    }
}
new SegfaultScenario();
gc_collect_cycles();