b.php 
     'fdipzone',    'gender'=>'male',    'age'=>30);doRequest($url, $param);echo "立马输出";function doRequest($url, $param=array()){    $urlinfo = parse_url($url);    $host = $urlinfo['host'];    $path = $urlinfo['path'];    $query = isset($param)? http_build_query($param) : '';    $port = 80;    $errno = 0;    $errstr = '';    $timeout = 10;    $fp = fsockopen($host, $port, $errno, $errstr, $timeout);    stream_set_blocking($fp,true);//开启了手册上说的非阻塞模式    stream_set_timeout($fp,1);//设置超时    $out = "POST ".$path." HTTP/1.1\r\n";    $out .= "host:".$host."\r\n";    $out .= "content-length:".strlen($query)."\r\n";    $out .= "content-type:application/x-www-form-urlencoded\r\n";    $out .= "connection:close\r\n\r\n";    $out .= $query;    fputs($fp, $out);    fclose($fp);  /* //需要显示返回的信息，就用这个   fwrite($fp, $out);    $content = '';    while (!feof($fp)) {        $content .= fgets($fp);    }    fclose($fp);    echo $content;//处理返回的信息  */}

a.php

打开上面的b.php   ，过10秒以后，a页面将接收到的东西写到1.txt里面，

打开b.php后，关闭页面也会执行异步写入操作，不会断开