php event拓展基本使用

2019-02-04 22:02:28

(527)

1. 确定io复用类型(select/poll/epoll)

```php

$cfg = new EventConfig();

$cfg->avoidMethod("select");

$cfg->avoidMethod("epoll");

$base = new EventBase($cfg);

$sig = Event::signal($base, SIGTERM, function($signal, $parameter) {

echo "signal captured", PHP_EOL;

});

$sig->addSignal();

var_dump($base->getMethod()); //打印io模型

$base->loop(); //开始时间循环

```

说明:

- 通过调用EventBase的初始化参数的`avoidMethod`方法排除指定的io模型,留下期望的模型

- linux中SIGKILL信号应用程序无权处理,需注意

2. 基于event的信号处理

```php

$base = new EventBase();

$sig = Event::signal($base, SIGTERM, function($signal, $parameter) {

echo "signal captured", PHP_EOL;

});

$sig->addSignal();

$base->loop();

```

3. 基于event的定时器(单次)

```php

$base = new EventBase;

$waitTime = 3; //设置定时时间

$event = Event::timer($base, function($t) {

echo "$waitTime seconds elapsed", PHP_EOL;

}, $waitTime);

$event->addTimer($waitTime);

$base->loop();

````

4. 基于event的定时器(多次)

```php

$base = new EventBase;

$event = new Event($base, -1, Event::TIMEOUT | Event::PERSIST, function() {

echo "i am timer", PHP_EOL;

}); //Event::PERSIST

$event->add(3);

$base->loop();

```