php文件下载控制速度坑

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    public function down($filename)
    {
        if(file_exists($filename) && is_file($filename))
        {
            ob_end_clean();
            ob_start();
            header("Cache-Control: public");
            header("Content-Description: File Transfer");
            header('Content-Type: application/octet-stream');
            header('Content-disposition: attachment; filename='.basename($filename));
            header("Content-Type: application/zip");
            header("Content-Transfer-Encoding: binary"); 
            header('Content-Length: '. filesize($filename));
            $download_rate = 200;
            $fh = @fopen($filename, 'rb');
            while(!feof($fh)){
               $bufer = fread($fh, $download_rate);
               echo $bufer;
               ob_flush();
               flush();
               usleep(500);
            }
            @fclose($fh);
        }
        else
        {
            die('Fatal error: file does not exist!');
        }
    }

public function down($filename) { if(file_exists($filename) && is_file($filename)) { ob_end_clean(); ob_start(); header("Cache-Control: public"); header("Content-Description: File Transfer"); header('Content-Type: application/octet-stream'); header('Content-disposition: attachment; filename='.basename($filename)); header("Content-Type: application/zip"); header("Content-Transfer-Encoding: binary"); header('Content-Length: '. filesize($filename)); $download_rate = 200; $fh = @fopen($filename, 'rb'); while(!feof($fh)){ $bufer = fread($fh, $download_rate); echo $bufer; ob_flush(); flush(); usleep(500); } @fclose($fh); } else { die('Fatal error: file does not exist!'); } }