如何杀死从终端mac osx使用线程的php进程

I have run php script in terminal

php test.php

I always kill executing of the script by 'ctrl+c' or

kill pid

But now this script doesn't kill. I think it's because I use Thread in my script.

Does anyone know how I can stop executing of the script?

UPD code of the php script

class TestThread extends Thread {

    public function __construct() {

    }

    public function run() {
        while(true) {
            // Do something
            sleep(5);
        }
    }
}

$thread = new TestThread();
$thread->start();