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();
     }
     */