php下载文件函数

/*@desc：php下载文件函数，支持限速@param name 待下载文件名@param rate 速度，单位kb*/function download($file,$rate=false){set_time_limit(0);$content = file_get_contents($file);$filesize = strlen($content);header (‘Content-Length: ‘.$filesize);header (‘Content-type: application/file‘);header ("Content-Disposition: attachment; filename=".basename($file));if($rate){ ???ob_start(); ???$fr=fopen($file,"rb"); ???while (!feof($fr)){ ???????$data = fread($fr,round($rate*1024)); ???????echo $data; ???????ob_flush(); ???????flush(); ???????sleep(1); ???} ???if($fr){ ???????fclose($fr); ???}}else{ ???readfile($file);}}

download(‘2018.rar‘,128);