PHP에서 진행률 표시줄을 구현하는 방법

<?php
set_time_limit(0);  //设置程序执行时间
ignore_user_abort(true);    //设置断开连接继续执行
header(&#39;X-Accel-Buffering: no&#39;);    //关闭buffer
header(&#39;Content-type: text/html;charset=utf-8&#39;);    //设置网页编码
ob_start(); //打开输出缓冲控制
echo str_repeat(&#39; &#39;,1024*4);    //字符填充
$width = 1000;
$html = &#39;<div style="margin:100px auto; padding: 8px; border: 1px solid gray; background: #EAEAEA; width: %upx"><div style="padding: 0; background-color: white; border: 1px solid navy; width: %upx"><div id="progress" style="padding: 0; background-color: #FFCC66; border: 0; width: 0px; text-align: center; height: 16px"></div></div><div id="msg" style="font-family: Tahoma; font-size: 9pt;">正在处理...</div><div id="percent" style="position: relative; top: -34px; text-align: center; font-weight: bold; font-size: 8pt">0%%</div></div>&#39;;
echo sprintf($html, $width+8, $width);
echo ob_get_clean();    //获取当前缓冲区内容并清除当前的输出缓冲
flush();   //刷新缓冲区的内容，输出
$length = 11;
for($i=0; $i<$length; $i++) {
    sleep(rand(1,2));
    $proportion = ($i+1)/$length;
    if($i+1 == $length){
        $msg = &#39;同步完成&#39;;
    }else{
        $msg = &#39;正在同步第&#39; . ($i+1) . &#39;个用户&#39;;
    }
    $script = &#39;<script>document.getElementById("percent").innerText="%u%%";document.getElementById("progress").style.width="%upx";document.getElementById("msg").innerText="%s";</script>&#39;;
    echo sprintf($script, intval($proportion*100), intval(($i+1)/$length)*$width, $msg);
    echo ob_get_clean();    //获取当前缓冲区内容并清除当前的输出缓冲
    flush();   //刷新缓冲区的内容，输出
}