详解PHP协程:Go + Chan + Defer

2022-10-11 21:02:51 188 0
魁首哥

Swoole4提供的PHP协程语法借鉴自Golang,在此向GO开发组致敬

PHP+Swoole协程可以与Golang很好地互补。Golang:静态语言,严谨强大性能好,PHP+Swoole:动态语言,灵活简单易用

详解PHP协程:Go + Chan + Defer

如果有2个协程并发执行,另外一个协程,需要依赖这两个协程的执行结果,如果解决此问题呢?

答案就是使用通道(Channel)它有两个接口push和pop:

push:向通道中写入内容,如果已满,它会进入等待状态,有空间时自动恢复

pop:从通道中读取内容,如果为空,它会进入等待状态,有数据时自动恢复

案例:

$chan = new chan(2);

# 协程1

go (function () use ($chan) {

$result = [];

for ($i = 0; $i < 2; $i++)

{

$result += $chan->pop();

}

var_dump($result);

});

# 协程2

go(function () use ($chan) {

$cli = new Swoole\Coroutine\Http\Client(‘www.qq.com’, 80);

$cli->set([‘timeout’ => 10]);

$cli->setHeaders([

‘Host’ => “www.qq.com”,

“User-Agent” => ‘Chrome/49.0.2587.3’,

‘Accept’ => ‘text/html,application/xhtml+xml,application/xml’,

‘Accept-Encoding’ => ‘gzip’,

]);

$ret = $cli->get(‘/’);

// $cli->body 响应内容过大,这里用 Http 状态码作为测试

$chan->push([‘www.qq.com’ => $cli->statusCode]);

});

# 协程3

go(function () use ($chan) {

$cli = new Swoole\Coroutine\Http\Client(‘www.163.com’, 80);

$cli->set([‘timeout’ => 10]);

$cli->setHeaders([

‘Host’ => “www.163.com”,

“User-Agent” => ‘Chrome/49.0.2587.3’,

‘Accept’ => ‘text/html,application/xhtml+xml,application/xml’,

‘Accept-Encoding’ => ‘gzip’,

]);

$ret = $cli->get(‘/’);

// $cli->body 响应内容过大,这里用 Http 状态码作为测试

$chan->push([‘www.163.com’ => $cli->statusCode]);

});

创建了3个协程

协程1循环两次对通道进行pop,因为队列为空,它会进入等待状态

协程2和协程3执行完成后,会push数据,协程1拿到了结果,继续向下执行

延迟任务

Swoole\Runtime::enableCoroutine();

go(function () {

echo “a”;

defer(function () {

echo “~a”;

});

echo “b”;

defer(function () {

echo “~b”;

});

sleep(1);

echo “c”;

});

执行结果:abc~b~a

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