PHP工作者不能并行工作

Question

我遇到了问题：工作线程似乎是连续工作的。 这是一个非常简单的示例，仅用于演示问题。

我初始化我的工作线程并运行它们。它应该并行工作，但结果看起来像是连续处理的。

PHP 5.6.12 ， Windows 操作系统， Apache 服务器

DBWorker ： Which of course extends pThreads Worker class

class DBWorker extends Worker {

    private $str;

    public function __construct($str){
        $this->str = $str;
    }

    public function run(){
        $i=0;
        while($i < 10) {
            echo "$this->str: $i\n";
            $i++;
        }
    }
}

初始化：

private $DBWorker1;
private $DBWorker2;
private $DBWorker3;

/* ... */

public function __construct(){
    $this->DBWorker1 = new DBWorker("worker1");
    $this->DBWorker2 = new DBWorker("worker2");
    $this->DBWorker3 = new DBWorker("worker3");
}

/* ... */

$this->DBWorker1->start();      
$this->DBWorker2->start();      
$this->DBWorker3->start();      


$i=0;
while($i < 10) {
    echo "parent: $i\n";
    $i++;
}

var_dump($this->DBWorker1->shutdown());
var_dump($this->DBWorker2->shutdown());
var_dump($this->DBWorker3->shutdown());

结果：

parent: 0  
parent: 1  
parent: 2  
...  
parent: 6  
worker1: 0  
worker1: 1  
worker1: 2  
...  
worker1: 59  
worker2: 0  
worker2: 1  
worker2: 2  
...  
worker2: 59  
worker3: 0  
worker3: 1  
worker3: 2  
...  
worker3: 59  
parent: 7
parent: 8  
parent: 9  
bool(true)  
bool(true)  
bool(true)