php Header函数实现下载短点续传程序
本文章给大家来总结几种实现下载短点续传程序功能,这些函数中主要是用到了php的header函数,有需要了解的朋友可进入参考.
例如:下载时输出,下载文件大小,文件名等等,前提是.htaccess文件的配置需要添加一句 :SetEnv no-gzip dont-vary 就是针对文件不进行压缩处理.
例1,代码如下:
- <?php
- function download($file_dir,$file_name)
-
-
-
- {
- $file_dir = chop($file_dir);
-
- if($file_dir != '')
- {
- $file_path = $file_dir;
- if(substr($file_dir,strlen($file_dir)-1,strlen($file_dir)) != '/')
- $file_path .= '/';
- $file_path .= $file_name;
- } else {
- $file_path = $file_name;
- }
-
- if(!file_exists($file_path))
- {
- echo '对不起,你要下载的文件不存在。';
- return false;
- }
- $file_size = filesize($file_path);
- @header("Cache-control: public");
- @header("Pragma: public");
-
- @header("Content-Type: application/octetstream");
- header("Content-Length: $file_size");
- Header("Accept-Ranges: bytes");
- header("Content-Disposition: attachment; filename=".$file_name);
- $fp = fopen($file_path,"r");
- fpassthru($fp);
- return true;
- }
- download('路径参数','文件名');
- ?>
例2,代码如下:
- $fname = './MMLDZG.mp3';
- $fp = fopen($fname,'rb');
- $fsize = filesize($fname);
- if (isset($_SERVER['HTTP_RANGE']) && ($_SERVER['HTTP_RANGE'] != "") && preg_match("/^bytes=([0-9]+)-$/i", $_SERVER['HTTP_RANGE'], $match) && ($match[1] < $fsize)) {
- $start = $match[1];
- } else {
- $start = 0;
- }
- @header("Cache-control: public"); @header("Pragma: public");
- if ($star--> 0) {
- fseek($fp, $start);
- Header("HTTP/1.1 206 Partial Content");
- Header("Content-Length: " . ($fsize - $start));
- Header("Content-Ranges: bytes" . $start . "-" . ($fsize - 1) . "/" . $fsize);
- } else {
- header("Content-Length: $fsize");
- Header("Accept-Ranges: bytes");
- }
- @header("Content-Type: application/octet-stream");
- @header("Content-Disposition: attachment;filename=mmdld.mp3");
- fpassthru($fp);
fpassthru() 函数输出文件指针处的所有剩余数据,该函数将给定的文件指针从当前的位置读取到 EOF,并把结果写到输出缓冲区,上面两个实例对中文支持不好,下面这个函数很好的解决了这个问题,代码如下:
- <?php
-
-
-
-
-
-
-
-
-
-
-
-
-
- function download($path,$file) {
-
- $real = $path.'/'.$file;
-
- if(!file_exists($real)) {
-
- return false;
-
- }
-
- $size = filesize($real);
-
- $size2 = $size-1;
-
- $range = 0;
-
- if(isset($_SERVER['HTTP_RANGE'])) {
-
- header('HTTP /1.1 206 Partial Content');
-
- $range = str_replace('=','-',$_SERVER['HTTP_RANGE']);
-
- $range = explode('-',$range);
-
- $range = trim($range[1]);
-
- header('Content-Length:'.$size);
-
- header('Content-Range: bytes '.$range.'-'.$size2.'/'.$size);
-
- } else {
-
- header('Content-Length:'.$size);
-
- header('Content-Range: bytes 0-'.$size2.'/'.$size);
-
- }
-
- header('Accenpt-Ranges: bytes');
-
- header('application/octet-stream');
-
- header("Cache-control: public");
-
- header("Pragma: public");
-
-
-
- $ua = $_SERVER['HTTP_USER_AGENT'];
-
- if(preg_match('/MSIE/',$ua)) {
-
- $ie_filename = str_replace('+','%20',urlencode($file));
-
- header('Content-Dispositon:attachment; filename='.$ie_filename);
-
- } else {
-
- header('Content-Dispositon:attachment; filename='.$file);
-
- }
-
- $fp = fopen($real,'rb+');
-
- fseek($fp,$range);
-
- while(!feof($fp)) {
-
- set_time_limit(0);
-
- print(fread($fp,1024));
-
- flush();
-
- ob_flush();
-
- }
-
- fclose($fp);
-
- }
-
-
- ?>