PHP关闭HTTP连接然后继续处理？

Question

为什么需要这个函数的最后一行才能使它工作？我不明白这是怎么回事。不过它确实有效。

function close_connection() {
    // if we're using sessions this stops them from hanging on other requests
    session_write_close();
    // get the content length from the buffer (the whole point of the buffer)
    header('Content-Length: 0');
    // close the connection
    header('Connection: close');
    // flush the buffers to the screen
    flush();

    // connection closing doesn't work without this. I don't know why
    echo ' ';
}

Answer 1

只要第一个字节输出到浏览器，就会发送 header 。
您也可以尝试使用 ob_end_flush();