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php Header函数实现下载短点续传程序

Jun 13, 2016 am 11:28 AM
header php download several kinds function accomplish Summarize article program

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 复制代码

function download($file_dir,$file_name)
//参数说明:
//file_dir:文件所在目录
//file_name:文件名
{
$file_dir = chop($file_dir);//去掉路径中多余的空格
//得出要下载的文件的路径
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 = $file_name;
}
//判断要下载的文件是否存在
if(!file_exists($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-Encoding: gzip");
@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 复制代码
$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]     $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 复制代码

 

  /**

  * PHP-HTTP断点续传实现

  * @param string $path: 文件所在路径

  * @param string $file: 文件名

  * @return void

  */

  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");

  //解决在IE中下载时中文乱码问题

  $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);

  }

  /*End of PHP*/


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