PHP 提前关闭连接。如果完成任何输出，脚本将挂起

Question

我提前关闭了与客户端的连接:

static public function early_close( $output )
{
   ignore_user_abort(true);
   echo $output;

   // Disable gzip compression in apache, as it can result in this request being buffered until it is complete,
   // regardless of other settings.
   if (function_exists('apache_setenv')) {
       apache_setenv('no-gzip', 1);
   }

    // get the size of the output
    $size = ob_get_length();

    // send headers to tell the browser to close the connection
    header("Content-Length: $size");
    header('Connection: close');
    header("Content-Encoding: none"); // To disable Apache compressing anything

    // IF PHP-FM
    // fastcgi_finish_request();

    // flush all output
    if( ob_get_level() > 0 )
    {
        ob_end_flush();
        ob_get_level()? ob_flush():null;
        flush();
    }

    // if you're using sessions, this prevents subsequent requests
    // from hanging while the background process executes
    if( session_id() )
    {
        session_write_close();
    }
}

工作正常，但在此事件之后，如果某些脚本输出任何内容(通过回显或通过添加新 header )，脚本将从该点停止执行。
我试图在提前关闭然后丢弃它之后开始输出缓冲，但它不起作用:

Server::early_close();
ob_start();
heavy_work();
ob_clean();

有什么想法吗？
使用 php 5.3.x

Answer 1

执行此操作的经典代码是:

ob_end_clean();
header("Connection: close");
ignore_user_abort();              // optional ob_start();

echo ('Text the user will see');

$size = ob_get_length();
header("Content-Length: $size");
ob_end_flush();                   // Strange behaviour, will not work
flush();                          // Unless both are called !

// Do processing here
sleep(30);

echo('Text user will never see');

否则，如果您想进行异步调用，我建议阅读以下内容:Methods for asynchronous processes in PHP