PHP实现HTTP断点续传的方法

本文实例讲述了PHP实现HTTP断点续传的方法。分享给大家供大家参考。具体实现方法如下：

    <?php
    /**
     * 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);
    }

希望本文所述对大家的php程序设计有所帮助。