php下载文件显示进度（适用于cli模式或长连接）

<?php
/*
@desc：php下载文件显示进度
@param file 待下载文件名
@param name 存储到本地文件名
*/
function downloadprogress($file,$name){
$dir = dirname($name);
if(!is_dir($dir)){
    mkdir($dir,0755,true);
}
ob_start();
set_time_limit(0);
$fr = fopen ($file, "rb");
if ($fr) {
    $content = file_get_contents($file);
    $filesize = strlen($content);
    $fw = fopen ($name, "wb");
    $downlen=0;
    $last = 0;
    $diff = 0;
    echo "[";
    if ($fw) {
        while(!feof($fr)) {
            $data = fread($fr, 1024 * 8 );
            $downlen += strlen($data);
            fwrite($fw, $data, 1024 * 8 );
            $percent = round($downlen/$filesize*100,2);
            $diff += $percent - $last;
            if($diff > 1){
                echo "#";
                $diff = 0;
            }
            $last = $percent;
            ob_flush();
            flush();
        }
        echo "#]done";
    }
    if ($fr) {
        fclose($fr);
    }
    if ($fw) {
        fclose($fw);
    }
}
}

downloadprogress('2018.rar','aaa/01.rar');