PHP实现异步处理

两个文件：（1）brief.php主程序文件（2）doRequest.php需要异步处理的程序

brief.php：

$url = 'localhost:8867';

echo 123; // 先输出，中间部分为异步处理程序
$fp = fsockopen($url,-1, $errno, $errstr, 30);
if (!$fp) {
    echo "$errstr ($errno)<br />
";
} else {
    $out = "GET /doRequest.php   HTTP/1.1
";
    $out .= "Host: ".$url."
";
    $out .= "Connection: Close

";
    //stream_set_blocking($fp,true);
    //stream_set_timeout($fp,1);
    fwrite($fp, $out);
    usleep(1000);
    fclose($fp);
}

echo 4567;

doRequest.php：

echo 123;
$param = ['$_GET', '$_POST'];
sleep(2);
file_put_contents('./dorequest.txt', var_export($param, true), FILE_APPEND);