获得文件的mime type类型

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<?php
/**
 * 获得文件的mime type类型
 * @author xiaobing.meng
 *
 */
class MimeTypes {
	public static $mime_types = array (
			'apk' => 'application/vnd.android.package-archive',
			'3gp' => 'video/3gpp', 
            'ai' => 'application/postscript', 
			'aif' => 'audio/x-aiff', 
            'aifc' => 'audio/x-aiff', 
			'aiff' => 'audio/x-aiff', 
            'asc' => 'text/plain', 
			'atom' => 'application/atom+xml', 
            'au' => 'audio/basic', 
			'avi' => 'video/x-msvideo', 
            'bcpio' => 'application/x-bcpio', 
			'bin' => 'application/octet-stream', 
            'bmp' => 'image/bmp', 
			'cdf' => 'application/x-netcdf', 
            'cgm' => 'image/cgm', 
			'class' => 'application/octet-stream', 
			'cpio' => 'application/x-cpio', 
			'cpt' => 'application/mac-compactpro', 
			'csh' => 'application/x-csh', 
            'css' => 'text/css', 
			'dcr' => 'application/x-director', 
            'dif' => 'video/x-dv', 
			'dir' => 'application/x-director', 
            'djv' => 'image/vnd.djvu', 
			'djvu' => 'image/vnd.djvu', 
			'dll' => 'application/octet-stream', 
			'dmg' => 'application/octet-stream', 
			'dms' => 'application/octet-stream', 
			'doc' => 'application/msword', 
            'dtd' => 'application/xml-dtd', 
			'dv' => 'video/x-dv', 
            'dvi' => 'application/x-dvi', 
			'dxr' => 'application/x-director', 
			'eps' => 'application/postscript', 
            'etx' => 'text/x-setext', 
			'exe' => 'application/octet-stream', 
			'ez' => 'application/andrew-inset', 
            'flv' => 'video/x-flv', 
			'gif' => 'image/gif', 
            'gram' => 'application/srgs', 
			'grxml' => 'application/srgs+xml', 
			'gtar' => 'application/x-gtar', 
            'gz' => 'application/x-gzip', 
			'hdf' => 'application/x-hdf', 
			'hqx' => 'application/mac-binhex40', 
            'htm' => 'text/html', 
			'html' => 'text/html', 
            'ice' => 'x-conference/x-cooltalk', 
			'ico' => 'image/x-icon', 
            'ics' => 'text/calendar', 
			'ief' => 'image/ief', 
            'ifb' => 'text/calendar', 
			'iges' => 'model/iges', 
            'igs' => 'model/iges', 
			'jnlp' => 'application/x-java-jnlp-file', 
            'jp2' => 'image/jp2', 
			'jpe' => 'image/jpeg', 
            'jpeg' => 'image/jpeg', 
			'jpg' => 'image/jpeg', 
            'js' => 'application/x-javascript', 
			'kar' => 'audio/midi', 
            'latex' => 'application/x-latex', 
			'lha' => 'application/octet-stream', 
			'lzh' => 'application/octet-stream', 
			'm3u' => 'audio/x-mpegurl', 
            'm4a' => 'audio/mp4a-latm', 
			'm4p' => 'audio/mp4a-latm', 
            'm4u' => 'video/vnd.mpegurl', 
			'm4v' => 'video/x-m4v', 
            'mac' => 'image/x-macpaint', 
			'man' => 'application/x-troff-man', 
			'mathml' => 'application/mathml+xml', 
			'me' => 'application/x-troff-me', 
            'mesh' => 'model/mesh', 
			'mid' => 'audio/midi', 
            'midi' => 'audio/midi', 
			'mif' => 'application/vnd.mif', 
            'mov' => 'video/quicktime', 
			'movie' => 'video/x-sgi-movie', 
            'mp2' => 'audio/mpeg', 
			'mp3' => 'audio/mpeg', 
            'mp4' => 'video/mp4', 
			'mpe' => 'video/mpeg', 
            'mpeg' => 'video/mpeg', 
			'mpg' => 'video/mpeg', 
            'mpga' => 'audio/mpeg', 
			'ms' => 'application/x-troff-ms', 
            'msh' => 'model/mesh', 
			'mxu' => 'video/vnd.mpegurl', 
            'nc' => 'application/x-netcdf', 
			'oda' => 'application/oda', 
            'ogg' => 'application/ogg', 
			'ogv' => 'video/ogv', 
            'pbm' => 'image/x-portable-bitmap', 
			'pct' => 'image/pict', 
            'pdb' => 'chemical/x-pdb', 
			'pdf' => 'application/pdf', 
			'pgm' => 'image/x-portable-graymap', 
			'pgn' => 'application/x-chess-pgn', 
            'pic' => 'image/pict', 
			'pict' => 'image/pict', 
            'png' => 'image/png', 
			'pnm' => 'image/x-portable-anymap', 
			'pnt' => 'image/x-macpaint', 
            'pntg' => 'image/x-macpaint', 
			'ppm' => 'image/x-portable-pixmap', 
			'ppt' => 'application/vnd.ms-powerpoint', 
			'ps' => 'application/postscript', 
            'qt' => 'video/quicktime', 
			'qti' => 'image/x-quicktime', 
            'qtif' => 'image/x-quicktime', 
			'ra' => 'audio/x-pn-realaudio', 
			'ram' => 'audio/x-pn-realaudio', 
            'ras' => 'image/x-cmu-raster', 
			'rdf' => 'application/rdf+xml', 
            'rgb' => 'image/x-rgb', 
			'rm' => 'application/vnd.rn-realmedia', 
			'roff' => 'application/x-troff', 
            'rtf' => 'text/rtf', 
			'rtx' => 'text/richtext', 
            'sgm' => 'text/sgml', 
			'sgml' => 'text/sgml', 
            'sh' => 'application/x-sh', 
			'shar' => 'application/x-shar', 
            'silo' => 'model/mesh', 
			'sit' => 'application/x-stuffit', 
			'skd' => 'application/x-koan', 
            'skm' => 'application/x-koan', 
			'skp' => 'application/x-koan', 
            'skt' => 'application/x-koan', 
			'smi' => 'application/smil', 
            'smil' => 'application/smil', 
			'snd' => 'audio/basic', 
            'so' => 'application/octet-stream', 
			'spl' => 'application/x-futuresplash', 
			'src' => 'application/x-wais-source', 
			'sv4cpio' => 'application/x-sv4cpio', 
			'sv4crc' => 'application/x-sv4crc', 
            'svg' => 'image/svg+xml', 
			'swf' => 'application/x-shockwave-flash', 
			't' => 'application/x-troff', 
            'tar' => 'application/x-tar', 
			'tcl' => 'application/x-tcl', 
            'tex' => 'application/x-tex', 
			'texi' => 'application/x-texinfo', 
			'texinfo' => 'application/x-texinfo', 
            'tif' => 'image/tiff', 
			'tiff' => 'image/tiff', 
            'tr' => 'application/x-troff', 
			'tsv' => 'text/tab-separated-values', 
            'txt' => 'text/plain', 
			'ustar' => 'application/x-ustar', 
			'vcd' => 'application/x-cdlink', 
            'vrml' => 'model/vrml', 
			'vxml' => 'application/voicexml+xml', 
            'wav' => 'audio/x-wav', 
			'wbmp' => 'image/vnd.wap.wbmp', 
			'wbxml' => 'application/vnd.wap.wbxml', 
            'webm' => 'video/webm', 
			'wml' => 'text/vnd.wap.wml', 
			'wmlc' => 'application/vnd.wap.wmlc', 
			'wmls' => 'text/vnd.wap.wmlscript', 
			'wmlsc' => 'application/vnd.wap.wmlscriptc', 
			'wmv' => 'video/x-ms-wmv', 
            'wrl' => 'model/vrml', 
			'xbm' => 'image/x-xbitmap', 
            'xht' => 'application/xhtml+xml', 
			'xhtml' => 'application/xhtml+xml', 
			'xls' => 'application/vnd.ms-excel', 
			'xml' => 'application/xml', 
            'xpm' => 'image/x-xpixmap', 
			'xsl' => 'application/xml', 
            'xslt' => 'application/xslt+xml', 
			'xul' => 'application/vnd.mozilla.xul+xml', 
			'xwd' => 'image/x-xwindowdump', 
            'xyz' => 'chemical/x-xyz', 
			'zip' => 'application/zip' );

	public static function get_mimetype($ext) {
		return (isset ( self::$mime_types [$ext] ) ? self::$mime_types [$ext] : 'application/octet-stream');
	}
}