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HomeBackend DevelopmentPHP TutorialPHP非阻塞模式 (转从 尘缘)

PHP非阻塞模式 (转自 尘缘)

 

让PHP不再阻塞当PHP作为后端处理需要完成一些长时间处理,为了快速响应页面请求,不作结果返回判断的情况下,可以有如下措施:

一、若你使用的是FastCGI模式,使用fastcgi_finish_request()能马上结束会话,但PHP线程继续在跑。

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echo "program start.";
 
file_put_contents('log.txt','start-time:'.date('Y-m-d H:i:s'), FILE_APPEND);
fastcgi_finish_request();
sleep(1);
echo 'debug...';
file_put_contents('log.txt', 'start-proceed:'.date('Y-m-d H:i:s'), FILE_APPEND);
 
sleep(10);
file_put_contents('log.txt', 'end-time:'.date('Y-m-d H:i:s'), FILE_APPEND);

这个例子输出结果可看到输出program start.后会话就返回了,所以debug那个输出浏览器是接收不到的,而log.txt文件能完整接收到三个完成时间。

二、使用fsockopen、cUrl的非阻塞模式请求另外的网址

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$fp = fsockopen("www.example.com", 80, $errno, $errstr, 30);
if (!$fp) die('error fsockopen');
stream_set_blocking($fp,0);
$http = "GET /save.php  / HTTP/1.1\r\n";   
$http .= "Host: www.example.com\r\n";   
$http .= "Connection: Close\r\n\r\n";
fwrite($fp,$http);
fclose($fp);

利用cURL中的curl_multi_*函数发送异步请求

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$cmh = curl_multi_init();
$ch1 = curl_init();
curl_setopt($ch1, CURLOPT_URL, "http://localhost:6666/child.php");
curl_multi_add_handle($cmh, $ch1);
curl_multi_exec($cmh, $active);
echo "End\n";

三、使用Gearman、Swoole扩展
Gearman是一个具有php扩展的分布式异步处理框架,能处理大批量异步任务;
Swoole最近很火,有很多异步方法,使用简单。(尘缘注:号称重新定义PHP,把NodeJS喷得体无完肤。Swoole工具虽好,却感觉是扩展本身跟NodeJS没可比性)

四、使用redis等缓存、队列,将数据写入缓存,使用后台计划任务实现数据异步处理。
这个方法在常见的大流量架构中应该很常见吧

五、极端的情况下,可以调用系统命令,可以将数据传给后台任务执行,个人感觉不是很高效。

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$cmd = 'nohup php ./processd.php $someVar >/dev/null  &';
`$cmd`

六、外国佬的大招,没看懂,php原生支持
http://nikic.github.io/2012/12/22/Cooperative-multitasking-using-coroutines-in-PHP.html

七、安装pcntl扩展,使用pcntl_fork生成子进程异步执行任务,个人觉得是最方便的,但也容易出现zombie process。

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if (($pid = pcntl_fork()) == 0) {
    child_func();    //子进程函数,主进程运行
} else {
    father_func();   //主进程函数
}
 
echo "Process " . getmypid() . " get to the end.\n";
 
function father_func() {
    echo "Father pid is " . getmypid() . "\n";
}
 
function child_func() {
    sleep(6);
    echo "Child process exit pid is " . getmypid() . "\n";
    exit(0);
}
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