求帮看下这段PHP下载MP4文件的问题，文件下载不完整-PHP Tutorial-php.cn

求帮看下这段PHP下载MP4文件的问题，文件下载不完整

WBOY

Release： 2016-06-23 13:39:30

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function dl_file($file){    $len = filesize($file);    $filename = basename($file);    $file_extension = strtolower(substr(strrchr($filename,"."),1));    switch( $file_extension ) {    case "mp4": $ctype="video/mp4"; break;    default: $ctype="application/force-download";    }    header("Pragma: public");    header("Expires: 0");    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");    header("Cache-Control: public");     header("Content-Description: File Transfer");    header("Content-Type: $ctype");    $header="Content-Disposition: attachment; filename=".$filename."";    header($header );    header("Content-Transfer-Encoding: binary");    header("Content-Length: ".$len);	ob_clean();    flush();    readfile($file);    exit;}dl_file('test.mp4');

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在火狐，谷歌浏览器下载正常，IE和迅雷下载文件不完整

回复讨论(解决方案)

ob_clean();
flush();
readfile($file);

有这句呀

没加mime头

header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$len);
这俩删掉试试

没加mime头

MIME类型吗？加那，IIS吗

header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$len);
这俩删掉试试

$len = filesize($file);
header("Content-Length: ".$len);
上面2句删除后可以下载，但没统计文件大小，迅雷和IE没显示下载时长。

nginx + php 环境下没有你说的那个问题，ie和迅雷都可以正常下载不过我的文件是flv，这样的话也只能说明是mime头出错了
我的代码如下：

function dl_file($file){
    $len = filesize($file);
    $filename = basename($file);
    $file_extension = strtolower(substr(strrchr($filename,"."),1));
    switch( $file_extension ) {
    case "mp4": $ctype="video/mp4"; break;
    default: $ctype="application/force-download";
    }
    header("Pragma: public");
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: public");
    header("Content-Description: File Transfer");
    header("Content-Type: $ctype");
    $header="Content-Disposition: attachment; filename=".$filename."";
    header($header );
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".$len);
    ob_clean();
    flush();
    readfile($file);
    exit;
}
dl_file('http://res.805.com/videos/霍山·上林后苑(易仟亿集团) [640x480].flv'); 只改了一个文件名而已  其他的都没变