<span style="font-family:FangSong_GB2312;font-size:14px;"><span style="font-family:FangSong_GB2312;font-size:14px;">/** $file_size 文件大小 */functiongetRange($file_size){$range =isset($_SERVER['HTTP_RANGE'])?$_SERVER['HTTP_RANGE']:null;if(!empty($range)){$range =preg_replace('/[\s|,].*/', '', $range);$range =explode('-',substr($range,6));if(count($range) < 2 ) {$range[1] = $file_size;}$range =array_combine(array('start','end'),$range);if(empty($range['start'])) {$range['start'] = 0;}if (!isset($range['end']) || empty($range['end'])) {$range['end'] = $file_size;}return$range;}return null;}
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<span style="font-family:FangSong_GB2312;font-size:14px;"><span style="font-family:FangSong_GB2312;font-size:14px;">$speed = 512;//此参数为下载最大速度$pos =strrpos($file_path, "/");$file_name =substr($file_path, $pos+1);$file_size =filesize($file_path);$ranges =getRange($file_size);$fh = fopen($file_path, "rb");header('Cache-control: public');header('Content-Type: application/octet-stream');header('Content-Disposition: attachment; filename='.$file_name);if ($ranges !=null) {header('HTTP/1.1 206 Partial Content');header('Accept-Ranges: bytes');header(sprintf('Content-Length: %u',$ranges['end'] - $ranges['start']));header(sprintf('Content-Range: bytes %s-%s/%s', $ranges['start'],$ranges['end'], $file_size));fseek($fh,sprintf('%u',$ranges['start']));}else{header("HTTP/1.1 200 OK");header(sprintf('Content-Length:%s', $file_size));}while(!feof($fh)){echo fread($fh, round($speed*1024, 0));ob_flush();sleep(1);}($fh != null)&& fclose($fh);</span></span>