让图片也能像附件一样的下载，不多说了。请看下面的程序！
// 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', ); ?>
复制代码 代码如下:
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!');
}
}
?>以上就是php让图片可以下载的代码_php技巧的内容，更多相关内容请关注PHP中文网（www.php.cn）！
jQuery移动端和桌面设备的轻量级幻灯片特效源码
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jQuery移动端和桌面设备的轻量级幻灯片特效源码是一款支持移动端和桌面设备的轻量级jQuery幻灯片插件swipeslider的特效。它支持图片和其它HTML内容，支持幻灯片内容无限循环播放。本代码适用浏览器：搜狗、360、FireFox、Chrome、Safari、Opera、傲游、世界之窗，不支持IE8及以下浏览器。有兴趣的朋友们可以来下载试试吧。本段代码兼容目前最新的各类主流浏览器，是一款
