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PHP下载断点续传

May 23, 2016 am 09:54 AM

php代码

/*
 * PHP下载断点续传
 */
function dl_file_resume($file){ 
  
    //检测文件是否存在 
    if (!is_file($file)) { die("<b>404 File not found!</b>"); } 
       
       
    $len = filesize($file);//获取文件大小 
    $filename = basename($file);//获取文件名字 
    $file_extension = strtolower(substr(strrchr($filename,"."),1));//获取文件扩展名 
       
    //根据扩展名 指出输出浏览器格式 
    switch( $file_extension ) { 
        case "exe": $ctype="application/octet-stream"; break; 
        case "zip": $ctype="application/zip"; break; 
        case "mp3": $ctype="audio/mpeg"; break; 
        case "mpg":$ctype="video/mpeg"; break; 
        case "avi": $ctype="video/x-msvideo"; break; 
        default: $ctype="application/force-download"; 
    } 
       
    //Begin writing headers 
    header("Cache-Control:"); 
    header("Cache-Control: public"); 
       
    //设置输出浏览器格式 
    header("Content-Type: $ctype"); 
    if (strstr($_SERVER[&#39;HTTP_USER_AGENT&#39;], "MSIE")) {//如果是IE浏览器 
        # workaround for IE filename bug with multiple periods / multiple dots in filename 
        # that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe 
        $iefilename = preg_replace(&#39;/\./&#39;, &#39;%2e&#39;, $filename, substr_count($filename, &#39;.&#39;) - 1); 
        header("Content-Disposition: attachment; filename=\"$iefilename\""); 
    } else { 
        header("Content-Disposition: attachment; filename=\"$filename\""); 
    } 
    header("Accept-Ranges: bytes"); 
       
    $size=filesize($file); 
    //如果有$_SERVER[&#39;HTTP_RANGE&#39;]参数 
    if(isset($_SERVER[&#39;HTTP_RANGE&#39;])) { 
/*   --------------------------- 
   Range头域   Range头域可以请求实体的一个或者多个子范围。例如,   表示头500个字节:bytes=0-499  

 表示第二个500字节:bytes=500-999   表示最后500个字节:bytes=-500   表示500字节以后的范围:

bytes=500-   第一个和最后一个字节:bytes=0-0,-1   同时指定几个范围:bytes=500-600,601-999   但是

服务器可以忽略此请求头,如果无条件GET包含Range请求头,响应会以状态码206(PartialContent)返回而不是以

200 (OK)。 
   ---------------------------*/
  
     
// 断点后再次连接 $_SERVER[&#39;HTTP_RANGE&#39;] 的值 bytes=4390912- 
     
        list($a, $range)=explode("=",$_SERVER[&#39;HTTP_RANGE&#39;]); 
   //if yes, download missing part 
        str_replace($range, "-", $range);//这句干什么的呢。。。。 
   $size2=$size-1;//文件总字节数 
        $new_length=$size2-$range;//获取下次下载的长度 
        header("HTTP/1.1 206 Partial Content"); 
        header("Content-Length: $new_length");//输入总长 
        header("Content-Range: bytes $range$size2/$size");
		//Content-Range: bytes 4908618-4988927/4988928   95%的时候 
    } else {//第一次连接 
        $size2=$size-1; 
        header("Content-Range: bytes 0-$size2/$size"); //Content-Range: bytes 0-4988927/4988928 
        header("Content-Length: ".$size);//输出总长 
    } 
    //打开文件 
    $fp=fopen("$file","rb"); 
    //设置指针位置 
    fseek($fp,$range); 
    //虚幻输出 
    while(!feof($fp)){ 
        //设置文件最长执行时间 
        set_time_limit(0); 
        print(fread($fp,1024*8));//输出文件 
        flush();//输出缓冲 
        ob_flush(); 
    } 
    fclose($fp); 
    exit; 
} 
  
  
dl_file_resume("aa.zip");//同级目录的1.zip 文件
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