PHP下载类代码

<?php
/**
* @author www.iklfy.com
* @copyright 2011
* @filename download.class.php
*/
/*
//文件下载类,以下调用示例代码
$download = new download('php,exe,html', false);
if (!$download->downloadfile($filename))
{
echo $download->geterrormsg();
}
*/
class download
{
var $debug = true;
var $errormsg = '';
var $Filter = array();
var $filename = '';
var $mineType = 'text/plain';
var $xlq_filetype = array();


function download($fileFilter = '', $isdebug = true)
{
$this->setFilter($fileFilter);
$this->setdebug($isdebug);
$this->setfiletype();
}
function setFilter($fileFilter)
{
if (empty($fileFilter)) return;
$this->Filter = explode(',', strtolower($fileFilter));
}
function setdebug($debug)
{
$this->debug = $debug;
}
function setfilename($filename)
{
$this->filename = $filename;
}
function downloadfile($filename)
{
$this->setfilename($filename);
if ($this->filecheck())
{
$fn = array_pop(explode('/', strtr($this->filename, '', '/')));
header('Pragma: public');
header('Expires: 0'); // set expiration time
header('Cache-Component: must-revalidate, post-check=0, pre-check=0');
header('Content-type:'.$this->mineType);
header('Content-Length: '.filesize($this->filename));
header('Content-Disposition: attachment; filename='.$fn);
header('Content-Transfer-Encoding: binary');
readfile($this->filename);
return true;
}
else
{
return false;
}
}
function geterrormsg()
{
return $this->errormsg;
}
function filecheck()
{
$filename = $this->filename;
if (file_exists($filename))
{
$filetype = strtolower(array_pop(explode('.', $filename)));
if (in_array($filetype, $this->Filter))
{
$this->errormsg .= $filename.'不允许下载!';
if ($this->debug) exit($filename.'不允许下载!');
return false;
}
else
{
if (function_exists("mime_content_type"))
{
$this->mineType = mime_content_type($filename);
}
if (empty($this->mineType))
{
if (isset($this->xlq_filetype[$filetype])) $this->mineType = $this->
xlq_filetype[$filetype];
}
if (!empty($this->mineType)) return true;
else
{
$this->errormsg .= '获取'.$filename.'文件类型时候发生错误,或者不存在预定文件类型内';
if ($this->debug) exit('获取文件类型出错');
return false;
}
}
}
else
{
$this->errormsg .= $filename.'不存在!';
if ($this->debug) exit($filename.'不存在!');
return false;
}
}
function setfiletype()
{
$this->xlq_filetype['chm'] = 'application/octet-stream';
$this->xlq_filetype['ppt'] = 'application/vnd.ms-powerpoint';
$this->xlq_filetype['xls'] = 'application/vnd.ms-excel';
$this->xlq_filetype['doc'] = 'application/msword';
$this->xlq_filetype['exe'] = 'application/octet-stream';
$this->xlq_filetype['rar'] = 'application/octet-stream';
$this->xlq_filetype['js'] = "javascript/js";
$this->xlq_filetype['css'] = "text/css";
$this->xlq_filetype['hqx'] = "application/mac-binhex40";
$this->xlq_filetype['bin'] = "application/octet-stream";
$this->xlq_filetype['oda'] = "application/oda";
$this->xlq_filetype['pdf'] = "application/pdf";
$this->xlq_filetype['ai'] = "application/postsrcipt";
$this->xlq_filetype['eps'] = "application/postsrcipt";
$this->xlq_filetype['es'] = "application/postsrcipt";
$this->xlq_filetype['rtf'] = "application/rtf";
$this->xlq_filetype['mif'] = "application/x-mif";
$this->xlq_filetype['csh'] = "application/x-csh";
$this->xlq_filetype['dvi'] = "application/x-dvi";
$this->xlq_filetype['hdf'] = "application/x-hdf";
$this->xlq_filetype['nc'] = "application/x-netcdf";
$this->xlq_filetype['cdf'] = "application/x-netcdf";
$this->xlq_filetype['latex'] = "application/x-latex";
$this->xlq_filetype['ts'] = "application/x-troll-ts";
$this->xlq_filetype['src'] = "application/x-wais-source";
$this->xlq_filetype['zip'] = "application/zip";
$this->xlq_filetype['bcpio'] = "application/x-bcpio";
$this->xlq_filetype['cpio'] = "application/x-cpio";
$this->xlq_filetype['gtar'] = "application/x-gtar";
$this->xlq_filetype['shar'] = "application/x-shar";
$this->xlq_filetype['sv4cpio'] = "application/x-sv4cpio";
$this->xlq_filetype['sv4crc'] = "application/x-sv4crc";
$this->xlq_filetype['tar'] = "application/x-tar";
$this->xlq_filetype['ustar'] = "application/x-ustar";
$this->xlq_filetype['man'] = "application/x-troff-man";
$this->xlq_filetype['sh'] = "application/x-sh";
$this->xlq_filetype['tcl'] = "application/x-tcl";
$this->xlq_filetype['tex'] = "application/x-tex";
$this->xlq_filetype['texi'] = "application/x-texinfo";
$this->xlq_filetype['texinfo'] = "application/x-texinfo";
$this->xlq_filetype['t'] = "application/x-troff";
$this->xlq_filetype['tr'] = "application/x-troff";
$this->xlq_filetype['roff'] = "application/x-troff";
$this->xlq_filetype['shar'] = "application/x-shar";
$this->xlq_filetype['me'] = "application/x-troll-me";
$this->xlq_filetype['ts'] = "application/x-troll-ts";
$this->xlq_filetype['gif'] = "image/gif";
$this->xlq_filetype['jpeg'] = "image/pjpeg";
$this->xlq_filetype['jpg'] = "image/pjpeg";
$this->xlq_filetype['jpe'] = "image/pjpeg";
$this->xlq_filetype['ras'] = "image/x-cmu-raster";
$this->xlq_filetype['pbm'] = "image/x-portable-bitmap";
$this->xlq_filetype['ppm'] = "image/x-portable-pixmap";
$this->xlq_filetype['xbm'] = "image/x-xbitmap";
$this->xlq_filetype['xwd'] = "image/x-xwindowdump";
$this->xlq_filetype['ief'] = "image/ief";
$this->xlq_filetype['tif'] = "image/tiff";
$this->xlq_filetype['tiff'] = "image/tiff";
$this->xlq_filetype['pnm'] = "image/x-portable-anymap";
$this->xlq_filetype['pgm'] = "image/x-portable-graymap";
$this->xlq_filetype['rgb'] = "image/x-rgb";
$this->xlq_filetype['xpm'] = "image/x-xpixmap";
$this->xlq_filetype['txt'] = "text/plain";
$this->xlq_filetype['c'] = "text/plain";
$this->xlq_filetype['cc'] = "text/plain";
$this->xlq_filetype['h'] = "text/plain";
$this->xlq_filetype['html'] = "text/html";
$this->xlq_filetype['htm'] = "text/html";
$this->xlq_filetype['htl'] = "text/html";
$this->xlq_filetype['rtx'] = "text/richtext";
$this->xlq_filetype['etx'] = "text/x-setext";
$this->xlq_filetype['tsv'] = "text/tab-separated-values";
$this->xlq_filetype['mpeg'] = "video/mpeg";
$this->xlq_filetype['mpg'] = "video/mpeg";
$this->xlq_filetype['mpe'] = "video/mpeg";
$this->xlq_filetype['avi'] = "video/x-msvideo";
$this->xlq_filetype['qt'] = "video/quicktime";
$this->xlq_filetype['mov'] = "video/quicktime";
$this->xlq_filetype['moov'] = "video/quicktime";
$this->xlq_filetype['movie'] = "video/x-sgi-movie";
$this->xlq_filetype['au'] = "audio/basic";
$this->xlq_filetype['snd'] = "audio/basic";
$this->xlq_filetype['wav'] = "audio/x-wav";
$this->xlq_filetype['aif'] = "audio/x-aiff";
$this->xlq_filetype['aiff'] = "audio/x-aiff";
$this->xlq_filetype['aifc'] = "audio/x-aiff";
$this->xlq_filetype['swf'] = "application/x-shockwave-flash";
}
}
?>

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