PHP附件下载header方式详解

Sat, 27 Feb 2010 06:45:41 +0000

// 文件目录
define('DL_DIR', 'temp/');

// 常见扩展名所对应的MIME类型
$MIMETypes = array(
    'ez'         => 'application/andrew-inset',
    'hqx'        => 'application/mac-binhex40',
    'cpt'        => 'application/mac-compactpro',
    'doc'        => 'application/msword',
    'bin'        => 'application/octet-stream',
    'dms'        => 'application/octet-stream',
    'lha'        => 'application/octet-stream',
    'lzh'        => 'application/octet-stream',
    'exe'        => 'application/octet-stream',
    'class'      => 'application/octet-stream',
    'so'         => 'application/octet-stream',
    'dll'        => 'application/octet-stream',
    'oda'        => 'application/oda',
    'pdf'        => 'application/pdf',
    'ai'         => 'application/postscrīpt',
    'eps'        => 'application/postscrīpt',
    'ps'         => 'application/postscrīpt',
    'smi'        => 'application/smil',
    'smil'       => 'application/smil',
    'mif'        => 'application/vnd.mif',
    'xls'        => 'application/vnd.ms-excel',
    'ppt'        => 'application/vnd.ms-powerpoint',
    'wbxml'      => 'application/vnd.wap.wbxml',
    'wmlc'       => 'application/vnd.wap.wmlc',
    'wmlsc'      => 'application/vnd.wap.wmlscrīptc',
    'bcpio'      => 'application/x-bcpio',
    'vcd'        => 'application/x-cdlink',
    'pgn'        => 'application/x-chess-pgn',
    'cpio'       => 'application/x-cpio',
    'csh'        => 'application/x-csh',
    'dcr'        => 'application/x-director',
    'dir'        => 'application/x-director',
    'dxr'        => 'application/x-director',
    'dvi'        => 'application/x-dvi',
    'spl'        => 'application/x-futuresplash',
    'gtar'       => 'application/x-gtar',
    'hdf'        => 'application/x-hdf',
    'js'         => 'application/x-javascrīpt',
    'skp'        => 'application/x-koan',
    'skd'        => 'application/x-koan',
    'skt'        => 'application/x-koan',
    'skm'        => 'application/x-koan',
    'latex'      => 'application/x-latex',
    'nc'         => 'application/x-netcdf',
    'cdf'        => 'application/x-netcdf',
    'sh'         => 'application/x-sh',
    'shar'       => 'application/x-shar',
    'swf'        => 'application/x-shockwave-flash',
    'sit'        => 'application/x-stuffit',
    'sv4cpio'    => 'application/x-sv4cpio',
    'sv4crc'     => 'application/x-sv4crc',
    'tar'        => 'application/x-tar',
    'tcl'        => 'application/x-tcl',
    'tex'        => 'application/x-tex',
    'texinfo'    => 'application/x-texinfo',
    'texi'       => 'application/x-texinfo',
    't'          => 'application/x-troff',
    'tr'         => 'application/x-troff',
    'roff'       => 'application/x-troff',
    'man'        => 'application/x-troff-man',
    'me'         => 'application/x-troff-me',
    'ms'         => 'application/x-troff-ms',
    'ustar'      => 'application/x-ustar',
    'src'        => 'application/x-wais-source',
    'xhtml'      => 'application/xhtml+xml',
    'xht'        => 'application/xhtml+xml',
    'zip'        => 'application/zip',
    'au'         => 'audio/basic',
    'snd'        => 'audio/basic',
    'mid'        => 'audio/midi',
    'midi'       => 'audio/midi',
    'kar'        => 'audio/midi',
    'mpga'       => 'audio/mpeg',
    'mp2'        => 'audio/mpeg',
    'mp3'        => 'audio/mpeg',
    'aif'        => 'audio/x-aiff',
    'aiff'       => 'audio/x-aiff',
    'aifc'       => 'audio/x-aiff',
    'm3u'        => 'audio/x-mpegurl',
    'ram'        => 'audio/x-pn-realaudio',
    'rm'         => 'audio/x-pn-realaudio',
    'rpm'        => 'audio/x-pn-realaudio-plugin',
    'ra'         => 'audio/x-realaudio',
    'wav'        => 'audio/x-wav',
    'pdb'        => 'chemical/x-pdb',
    'xyz'        => 'chemical/x-xyz',
    'bmp'        => 'image/bmp',
    'gif'        => 'image/gif',
    'ief'        => 'image/ief',
    'jpeg'       => 'image/jpeg',
    'jpg'        => 'image/jpeg',
    'jpe'        => 'image/jpeg',
    'png'        => 'image/png',
    'tiff'       => 'image/tiff',
    'tif'        => 'image/tiff',
    'djvu'       => 'image/vnd.djvu',
    'djv'        => 'image/vnd.djvu',
    'wbmp'       => 'image/vnd.wap.wbmp',
    'ras'        => 'image/x-cmu-raster',
    'pnm'        => 'image/x-portable-anymap',
    'pbm'        => 'image/x-portable-bitmap',
    'pgm'        => 'image/x-portable-graymap',
    'ppm'        => 'image/x-portable-pixmap',
    'rgb'        => 'image/x-rgb',
    'xbm'        => 'image/x-xbitmap',
    'xpm'        => 'image/x-xpixmap',
    'xwd'        => 'image/x-xwindowdump',
    'igs'        => 'model/iges',
    'iges'       => 'model/iges',
    'msh'        => 'model/mesh',
    'mesh'       => 'model/mesh',
    'silo'       => 'model/mesh',
    'wrl'        => 'model/vrml',
    'vrml'       => 'model/vrml',
    'css'        => 'text/css',
    'html'       => 'text/html',
    'htm'        => 'text/html',
    'asc'        => 'text/plain',
    'txt'        => 'text/plain',
    'rtx'        => 'text/richtext',
    'rtf'        => 'text/rtf',
    'sgml'       => 'text/sgml',
    'sgm'        => 'text/sgml',
    'tsv'        => 'text/tab-separated-values',
    'wml'        => 'text/vnd.wap.wml',
    'wmls'       => 'text/vnd.wap.wmlscrīpt',
    'etx'        => 'text/x-setext',
    'xsl'        => 'text/xml',
    'xml'        => 'text/xml',
    'mpeg'       => 'video/mpeg',
    'mpg'        => 'video/mpeg',
    'mpe'        => 'video/mpeg',
    'qt'         => 'video/quicktime',
    'mov'        => 'video/quicktime',
    'mxu'        => 'video/vnd.mpegurl',
    'avi'        => 'video/x-msvideo',
    'movie'      => 'video/x-sgi-movie',
    'ice'        => 'x-conference/x-cooltalk',
);

// 安全性过滤
$fileName = basename($_SERVER['QUERY_STRING']);
$filePath = dirname(__FILE__) . '/' . DL_DIR . $fileName;

/*
简述: DIRECTORY_SEPARATOR(目录界定符, 目录函数库预定义常量)
来源: Directory 目录函数(PHP手册->函数参考->Directories节点)
说明: windows系统下为反斜杠'\', Linux系统下为'/',
windows下两个都正常用, linux就不知道了, 为了标准, 显得专业点, 嘿嘿.
*/
$filePath = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $filePath);

if(!is_file($filePath)) {
    exit('File: ' . $fileName . ' not exists!');
} else { // 如果是一个有效的文件
    // 文件扩展名
    $fileExt = substr(strrchr($fileName, '.'), 1);
    // 文件类型
    $fileType = $MIMETypes[$fileExt] ? $MIMETypes[$fileExt] : 'application/octet-stream';
    // 是否是图片
    $isImage = False;
    /*
    简述: getimagesize(), 详见手册
    说明: 判定某个文件是否为图片的有效手段, 常用在文件上传验证
    */
    $imgInfo = @getimagesize($filePath);
    if ($imgInfo[2] && $imgInfo['bits']) {
        $isImage = True;
    }

    // 显示方式
    $attachment = $isImage ? 'inline' : 'attachment';

    // 读取文件
    if (is_readable($filePath)) {
        /*
        简述: ob_end_clean() 清空并关闭输出缓冲, 详见手册
        说明: 关闭输出缓冲, 使文件片段内容读取至内存后即被送出, 减少资源消耗
        */
        ob_end_clean();
        /*
         HTTP头信息: 指示客户机可以接收生存期不大于指定时间（秒）的响应
        */
        header('Cache-control: max-age=31536000');
        /*
         HTTP头信息: 缓存文件过期时间(格林威治标准时)
        */
        header('Expires: ' . gmdate('D, d M Y H:i:s', time()+31536000) . ' GMT');
        /*
         HTTP头信息: 文件在服务期端最后被修改的时间
         Cache-control,Expires,Last-Modified 都是控制浏览器缓存的头信息
         在一些访问量巨大的门户, 合理的设置缓存能够避免过多的服务器请求, 一定程度下缓解服务器的压力
        */
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s' , filemtime($filePath) . ' GMT'));
        /*
         HTTP头信息: 文档的编码(Encode)方法, 因为附件请求的文件多样化, 改变编码方式有可能损坏文件, 故为none
        */
        header('Content-Encoding: none');
        /*
         HTTP头信息: 告诉浏览器当前请求的文件类型.
          1.始终指定为application/octet-stream, 就代表文件是二进制流, 始终提示下载.
          2.指定对应的类型, 如请求的是mp3文件, 对应的MIME类型是audio/mpeg, IE就会自动启动Windows Media Player进行播放.
        */
        header('Content-type: ' . $fileType);
        /*
         HTTP头信息: 如果为attachment, 则告诉浏览器, 在访问时弹出"文件下载"对话框, 并指定保存时文件的默认名称(可以与服务器的文件名不同)
         如果要让浏览器直接显示内容, 则要指定为inline, 如图片, 文本
        */
        header('Content-Disposition: ' . $attachment . '; filename=' . $fileName);
        /*
         HTTP头信息: 告诉浏览器文件长度
         (IE下载文件的时候不是有文件大小信息么?)
        */
        header('Content-Length: ' . filesize($filePath));
        // 打开文件(二进制只读模式)
        $fp = fopen($filePath, 'rb');
        // 输出文件
        fpassthru($fp);
        // 关闭文件
        fclose($fp);
        exit();
    } else {
        exit('Read file failed!');
    }
}
?>

Tags - 附件 , header , 下载

[评论] PHP附件下载header方式详解

Thu, 01 Jan 1970 00:00:00 +0000

沧海一粟

PHP附件下载header方式详解

[评论] PHP附件下载header方式详解