求：php文件下载程序

Question

function sendFile($serverPath, $filename, $mimeType = 'application/octet-stream')
{
        header("Content-Type: {$mimeType}");
        $filename = '"' . urlencode($filename) . '"';
        header("Content-Disposition: attachment; filename={$filename}");
        readfile($serverPath);
        exit;
    }

Answer 1

还有就是如果直接定向到文件的话，文件类型只能是.rar的，其他的如.txt等会直接打开

Answer 2

test.php
<?php
header("Content-type: application/octet-stream");
header("Content-disposition: attachment; filename=\"llll.jpg\"");?><input type="button" name="Submit7" value="下载到本地硬盘" onclick=location.href="test.php">

Answer 3

Warning: Cannot modify header information - headers already sent by...
怎么出现这样的警告？
能不能给出完整一点的代码

Answer 4

$filename为要下载的文件$filesize=filesize($filename);
                          header("Content-Type:text/plain");
                          header("Accept-Ranges:bytes");
                          header("Accept-Length:".filesize($filename));
                          header("Content-Disposition: attachment;filename=".basename($filename));
                        @$fp = fopen($filename, 'rb');
                      @flock($fp, 2);
                    $attachment = @fread($fp, $filesize);
                    @fclose($fp);
                          echo $attachment;