Description:
------------
Different result return between extending Thread class and not.

Test script:
---------------
<?php
class Test extends Thread
{
    protected $member;
    public function __construct($member = null)
    {
        $this->member = $member;
        $this->member->text = 'changed text';
    }
}
class Text
{
    public $text = 'this is text';
}
$text = new Text();
$test = new Test($text);
echo $text->text.PHP_EOL;

Expected result:
----------------
changed text

Actual result:
--------------
this is text