php定时器没起作用,swoole_timer_tick定时器创建成功,但是不运行
### 问题描述
在进程池\Swoole\Process\Pool中使用swoole_timer_tick创建一个定时器，创建的位置为onWorkerStart回调中，创建后能得到定时器ID，并且调试信息为[2020-06-24 16:37:14 @15451.0]TRACEswTimer_add(:198): id=1, exec_msec=1000, msec=1000, round=0, exist=1，但是定时器并没有得到运行，并且没有抛出任何报错信息，请大神帮忙定位一下问题。
### Swoole版本，PHP版本，以及操作系统版本信息
swoole4.5.2
PHP 7.1.4
Ubuntu 16.04.6 LTS
### 相关代码
```php
namespace app\core\controller;
use Swoole\Server;
use think\Controller;
use \Swoole\Database\PDOConfig;
use \Swoole\Database\PDOPool;
use think\Db;
class Processtask extends Controller{
public $process_pool;
public $pair_id;
public function __construct(){
$this->process_pool = new \Swoole\Process\Pool(4);
$this->process_pool->on('workerStart',[$this,'onWorkerStart']);
$this->process_pool->on('WorkerStop',[$this,'onWorkerStop']);
$this->process_pool->set(["log_level"=>SWOOLE_LOG_DEBUG]);
swoole_set_process_name('coin_task');
$this->process_pool->start();
}
public function indexAction(){
var_dump("我是index");
}
public function onWorkerStart($pool, $workerId){
$running = true;
pcntl_signal(SIGTERM, function () use (&$running) {
$running = false;
});
switch ($workerId){
case 0:
swoole_set_process_name('coin_task_deposit_order_0');
var_dump("下单进程{$workerId}启动");
model("api/UserOrder")->depositOrderToOrder($running,$workerId);
break;
case 1:
swoole_set_process_name('coin_task_deposit_order_1');
var_dump("下单进程{$workerId}启动");
model("api/UserOrder")->depositOrderToOrder($running,$workerId);
break;
case 2:
cache("swoole_time_out",11,25);
swoole_set_process_name('coin_task_deposit_order_2');
var_dump("下单进程{$workerId}启动");
model("api/UserOrder")->depositOrderToOrder($running,$workerId);
break;
case 3:
swoole_set_process_name('coin_task_master_clear_3');
\Swoole\Timer::tick(1000,function($timer_id){
var_dump("定时器id为：");
});
//3000ms后执行此函数
swoole_timer_after(3000, function ($timer_id) {
file_put_contents(ROOT_PATH."runtime/log/".date("Ym")."/".date("d")."_start.log","定时器id为：".$timer_id,FILE_APPEND);
echo "after 3000ms.\n";
});
file_put_contents(ROOT_PATH."runtime/log/".date("Ym")."/".date("d")."_start.log","定时器id为：",FILE_APPEND);
$who_are_you = swoole_timer_tick(2000,[$this,"testTimers"]);
$pool->groupError_timer_id = $who_are_you;
var_dump("成团结算进程启动");
model("api/UserOrder")->groupClear($running,$workerId);
default:
break;
}
}
public function testTimers($timer_id){
var_dump("定时器id为：");
file_put_contents(ROOT_PATH."runtime/log/".date("Ym")."/".date("d")."_start.log","定时器id为：".$timer_id,FILE_APPEND);
}
public function onWorkerStop($pool, $workerId){
switch ($workerId){
case 0:
var_dump("下单进程{$workerId}停止");
break;
case 1:
var_dump("下单进程{$workerId}停止");
break;
case 2:
var_dump("下单进程{$workerId}停止");
break;
case 3:
$clear_status = \Swoole\Timer::clear($pool->groupError_timer_id);
var_dump("成团失败定时器".$pool->groupError_timer_id."结束,结束状态为：".$clear_status);
var_dump("成团结算进程停止");
break;
default:
break;
}
}
}
```
### 你期待的结果是什么？实际看到的错误信息又是什么？
期待结果为启动后能打印出定时器中的输出内容，结果为没有任何信息被打印出来，系统一切运行正常，打印出来的都为我正常的业务输出内容，如下：
[2020-06-24 17:07:06 @16003.0]TRACEphp_swoole_reactor_init(:254): init reactor
[2020-06-24 17:07:06 @16003.0]TRACEswTimer_add(:198): id=1, exec_msec=1000, msec=1000, round=0, exist=1
[2020-06-24 17:07:06 @16003.0]TRACEswTimer_add(:198): id=2, exec_msec=3000, msec=3000, round=0, exist=2
[2020-06-24 17:07:06 @16003.0]TRACEswTimer_add(:198): id=3, exec_msec=2000, msec=2000, round=0, exist=3
string(24) "成团结算进程启动"
string(19) "下单进程0启动"
string(19) "下单进程1启动"
string(19) "下单进程2启动"
string(31) "下单进程2没有取到数据"
string(36) "成团结算进程没有取到数据"
string(31) "下单进程1没有取到数据"
string(31) "下单进程0没有取到数据"
string(31) "下单进程2没有取到数据"
string(36) "成团结算进程没有取到数据"
string(31) "下单进程1没有取到数据"
string(31) "下单进程0没有取到数据"