Wait for a Thread to Finish in PHP

<?php
class TestThread extends Thread
{
    //
    function __construct($parameters) {
        $this->reverse = $parameters;
    }   

    public function run() {
        try {
            sleep(20);
            // Connecting to mysql database
            $cn = new mysqli(DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME);
            INSERT INTO DEVICE_SESSION_ADDRESS (X, Y, Z)
                VALUES (1,2,3)   
        } catch (Exception $ex) {
           //do stuffs
        } 
    }       
}
?>

function test ($response) {
    require_once 'TestThread.php';
    $rev = new TestThread($response);
    $rev->start();
 }