php Pthread 多线程 Worker

<?php
//PHP 高级编程之多线程 http://www.netkiller.cn/journal/thread.php.html#idp57489856
//worker 是一个具有持久化上下文的线程对象，通常用来在多个线程中使用。
//worker 对象start后，会直接运行run()方法，执行完毕之后，线程也不会die掉
//SQLQuery 是任务类
class SQLQuery extends Thread
{
public $worker;
public $sql;
public function __construct($sql)
{
$this->sql = $sql;
}

public function run()
{
$dbh = $this->worker->getConnection();
$row = $dbh->prepare($this->sql,array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
$row->execute();
while($member = $row->fetch(PDO::FETCH_ASSOC))
{
// print_r($member);
}
}
}
//worker 执行任务
class ExampleWorker extends Worker {
public static $dbh;
public function __construct($name) {
}

/*
* The run method should just prepare the environment for the work that is coming ...
*/
public function run(){
self::$dbh = new PDO('mysql:dbname=mix;host=192.168.33.11','root','');
}
public function getConnection(){
return self::$dbh;
}
}

$worker = new ExampleWorker("My Worker Thread");

for ($i = 0; $i < 5; ++$i) {
$worker->stack(new SQLQuery('select * from stores limit '.$i)); // 将要执行的任务入栈
}

echo "{$worker->getStacked()} tasks\n"; //获取栈中剩余的任务数量
$worker->start(); //执行完Worker中的对象后
$worker->shutdown(); //关闭Worker。 跟队列很像

/* 多线程检测服务是否正常案例 https://www.cnblogs.com/zz-952/p/9762284.html
这里会报错
Uncaught RuntimeException: the creator of ExampleWorker already started
没有线程die掉
while(true)
{
sleep(5);
$worker->start();
$worker->shutdown();
}
*/