mime (multipurpose internet mail extensions) 是描述消息内容类型的因特网标准。
MIME 消息能包含文本、图像、音频、视频以及其他应用程序专用的数据。
这篇文章主要介绍了php准确获取文件MIME类型的方法,涉及php针对文件属性操作的相关技巧,需要的朋友可以参考下
'application/postscript',
'eps' => 'application/postscript',
'exe' => 'application/octet-stream',
'doc' => 'application/vnd.ms-word',
'xls' => 'application/vnd.ms-excel',
'ppt' => 'application/vnd.ms-powerpoint',
'pps' => 'application/vnd.ms-powerpoint',
'pdf' => 'application/pdf',
'xml' => 'application/xml',
'odt' => 'application/vnd.oasis.opendocument.text',
'swf' => 'application/x-shockwave-flash',
// archives
'gz' => 'application/x-gzip',
'tgz' => 'application/x-gzip',
'bz' => 'application/x-bzip2',
'bz2' => 'application/x-bzip2',
'tbz' => 'application/x-bzip2',
'zip' => 'application/zip',
'rar' => 'application/x-rar',
'tar' => 'application/x-tar',
'7z' => 'application/x-7z-compressed',
// texts
'txt' => 'text/plain',
'php' => 'text/x-php',
'html' => 'text/html',
'htm' => 'text/html',
'js' => 'text/javascript',
'css' => 'text/css',
'rtf' => 'text/rtf',
'rtfd' => 'text/rtfd',
'py' => 'text/x-python',
'java' => 'text/x-java-source',
'rb' => 'text/x-ruby',
'sh' => 'text/x-shellscript',
'pl' => 'text/x-perl',
'sql' => 'text/x-sql',
// images
'bmp' => 'image/x-ms-bmp',
'jpg' => 'image/jpeg',
'jpeg' => 'image/jpeg',
'gif' => 'image/gif',
'png' => 'image/png',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'tga' => 'image/x-targa',
'psd' => 'image/vnd.adobe.photoshop',
//audio
'mp3' => 'audio/mpeg',
'mid' => 'audio/midi',
'ogg' => 'audio/ogg',
'mp4a' => 'audio/mp4',
'wav' => 'audio/wav',
'wma' => 'audio/x-ms-wma',
// video
'avi' => 'video/x-msvideo',
'dv' => 'video/x-dv',
'mp4' => 'video/mp4',
'mpeg' => 'video/mpeg',
'mpg' => 'video/mpeg',
'mov' => 'video/quicktime',
'wm' => 'video/x-ms-wmv',
'flv' => 'video/x-flv',
'mkv' => 'video/x-matroska'
);
function _getMimeDetect() {
if (class_exists('finfo')) {
return 'finfo';
} else if (function_exists('mime_content_type')) {
return 'mime_content_type';
} else if ( function_exists('exec')) {
$result = exec('file -ib '.escapeshellarg(FILE));
if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
return 'linux';
}
$result = exec('file -Ib '.escapeshellarg(FILE));
if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
return 'bsd';
}
}
return 'internal';
}
function _getMimeType($path) {
global $mime;
$fmime = _getMimeDetect();
switch($fmime) {
case 'finfo':
$finfo = finfo_open(FILEINFO_MIME);
if ($finfo)
$type = @finfo_file($finfo, $path);
break;
case 'mime_content_type':
$type = mime_content_type($path);
break;
case 'linux':
$type = exec('file -ib '.escapeshellarg($path));
break;
case 'bsd':
$type = exec('file -Ib '.escapeshellarg($path));
break;
default:
$pinfo = pathinfo($path);
$ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
$type = isset($mime[$ext]) ? $mime[$ext] : 'unkown';
break;
}
$type = explode(';', $type);
//需要加上这段，因为如果使用mime_content_type函数来获取一个不存在的$path时会返回'application/octet-stream'
if ($fmime != 'internal' AND $type[0] == 'application/octet-stream') {
$pinfo = pathinfo($path);
$ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
if (!empty($ext) AND !empty($mime[$ext])) {
$type[0] = $mime[$ext];
}
}
return $type[0];
}
$path = '1.txt'; //实际上当前路径并不存在1.txt
var_dump(_getMimeType($path));
/*End of php*/ 
