Description:
------------
When thread class create in static property, object destroy when start.



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

TestController::init();// bug;
new TestControllerV2; // not bug

class TestController
{
    public      static $count = 10;
    protected   static $_threads = array();

    public static function init()
    {
        for ($i = 0; $i < static::$count; $i++) {
            static::$_threads[$i] = new TestThread;
            static::$_threads[$i]->start();
        }
        print_r(static::$_threads);
    }
}


class TestControllerV2
{
    public      static $count = 10;
    protected   $_threads = array();

    public function __construct()
    {
        for ($i = 0; $i < static::$count; $i++) {
            $this->_threads[$i] = new TestThread;
            $this->_threads[$i]->start();
        }
        print_r($this->_threads);
    }
}


class TestThread extends Thread
{
    public function run()
    {
        sleep(5);
    }
}


Expected result:
----------------
First array with TestThread Object, not null.

Actual result:
--------------
Array
(
    [0] => 
    [1] => 
    [2] => 
    [3] => 
    [4] => 
    [5] => 
    [6] => 
    [7] => 
    [8] => 
    [9] => 
)
Array
(
    [0] => TestThread Object
        (
        )

    [1] => TestThread Object
        (
        )

    [2] => TestThread Object
        (
        )

    [3] => TestThread Object
        (
        )

    [4] => TestThread Object
        (
        )

    [5] => TestThread Object
        (
        )

    [6] => TestThread Object
        (
        )

    [7] => TestThread Object
        (
        )

    [8] => TestThread Object
        (
        )

    [9] => TestThread Object
        (
        )

)