php 获取文件mime类型、格式

//类定义结束
if( !function_exists ('mime_content_type')) {
	/**
	 +----------------------------------------------------------
	 * 获取文件的mime_content类型
	 +----------------------------------------------------------
	 * @return string
	 +----------------------------------------------------------
	 */
	function mime_content_type($filename) {
		static $contentType = array(
			'ai'	=> 'application/postscript',
				'aif'	=> 'audio/x-aiff',
				'aifc'	=> 'audio/x-aiff',
				'aiff'	=> 'audio/x-aiff',
				'asc'	=> 'application/pgp', //changed by skwashd - was text/plain
				'asf'	=> 'video/x-ms-asf',
				'asx'	=> 'video/x-ms-asf',
				'au'	=> 'audio/basic',
				'avi'	=> 'video/x-msvideo',
				'bcpio'	=> 'application/x-bcpio',
				'bin'	=> 'application/octet-stream',
				'bmp'	=> 'image/bmp',
				'c'	=> 'text/plain', // or 'text/x-csrc', //added by skwashd
				'cc'	=> 'text/plain', // or 'text/x-c++src', //added by skwashd
				'cs'	=> 'text/plain', //added by skwashd - for C# src
				'cpp'	=> 'text/x-c++src', //added by skwashd
				'cxx'	=> 'text/x-c++src', //added by skwashd
				'cdf'	=> 'application/x-netcdf',
				'class'	=> 'application/octet-stream',//secure but application/java-class is correct
				'com'	=> 'application/octet-stream',//added by skwashd
				'cpio'	=> 'application/x-cpio',
				'cpt'	=> 'application/mac-compactpro',
				'csh'	=> 'application/x-csh',
				'css'	=> 'text/css',
				'csv'	=> 'text/comma-separated-values',//added by skwashd
				'dcr'	=> 'application/x-director',
				'diff'	=> 'text/diff',
				'dir'	=> 'application/x-director',
				'dll'	=> 'application/octet-stream',
				'dms'	=> 'application/octet-stream',
				'doc'	=> 'application/msword',
				'dot'	=> 'application/msword',//added by skwashd
				'dvi'	=> 'application/x-dvi',
				'dxr'	=> 'application/x-director',
				'eps'	=> 'application/postscript',
				'etx'	=> 'text/x-setext',
				'exe'	=> 'application/octet-stream',
				'ez'	=> 'application/andrew-inset',
				'gif'	=> 'image/gif',
				'gtar'	=> 'application/x-gtar',
				'gz'	=> 'application/x-gzip',
				'h'	=> 'text/plain', // or 'text/x-chdr',//added by skwashd
				'h++'	=> 'text/plain', // or 'text/x-c++hdr', //added by skwashd
				'hh'	=> 'text/plain', // or 'text/x-c++hdr', //added by skwashd
				'hpp'	=> 'text/plain', // or 'text/x-c++hdr', //added by skwashd
				'hxx'	=> 'text/plain', // or 'text/x-c++hdr', //added by skwashd
				'hdf'	=> 'application/x-hdf',
				'hqx'	=> 'application/mac-binhex40',
				'htm'	=> 'text/html',
				'html'	=> 'text/html',
				'ice'	=> 'x-conference/x-cooltalk',
				'ics'	=> 'text/calendar',
				'ief'	=> 'image/ief',
				'ifb'	=> 'text/calendar',
				'iges'	=> 'model/iges',
				'igs'	=> 'model/iges',
				'jar'	=> 'application/x-jar', //added by skwashd - alternative mime type
				'java'	=> 'text/x-java-source', //added by skwashd
				'jpe'	=> 'image/jpeg',
				'jpeg'	=> 'image/jpeg',
				'jpg'	=> 'image/jpeg',
				'js'	=> 'application/x-javascript',
				'kar'	=> 'audio/midi',
				'latex'	=> 'application/x-latex',
				'lha'	=> 'application/octet-stream',
				'log'	=> 'text/plain',
				'lzh'	=> 'application/octet-stream',
				'm3u'	=> 'audio/x-mpegurl',
				'man'	=> 'application/x-troff-man',
				'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',
				'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',
				'patch'	=> 'text/diff',
				'pbm'	=> 'image/x-portable-bitmap',
				'pdb'	=> 'chemical/x-pdb',
				'pdf'	=> 'application/pdf',
				'pgm'	=> 'image/x-portable-graymap',
				'pgn'	=> 'application/x-chess-pgn',
				'pgp'	=> 'application/pgp',//added by skwashd
				'php'	=> 'application/x-httpd-php',
				'php3'	=> 'application/x-httpd-php3',
				'pl'	=> 'application/x-perl',
				'pm'	=> 'application/x-perl',
				'png'	=> 'image/png',
				'pnm'	=> 'image/x-portable-anymap',
				'po'	=> 'text/plain',
				'ppm'	=> 'image/x-portable-pixmap',
				'ppt'	=> 'application/vnd.ms-powerpoint',
				'ps'	=> 'application/postscript',
				'qt'	=> 'video/quicktime',
				'ra'	=> 'audio/x-realaudio',
				'rar'=>'application/octet-stream',
				'ram'	=> 'audio/x-pn-realaudio',
				'ras'	=> 'image/x-cmu-raster',
				'rgb'	=> 'image/x-rgb',
				'rm'	=> 'audio/x-pn-realaudio',
				'roff'	=> 'application/x-troff',
				'rpm'	=> 'audio/x-pn-realaudio-plugin',
				'rtf'	=> 'text/rtf',
				'rtx'	=> 'text/richtext',
				'sgm'	=> 'text/sgml',
				'sgml'	=> 'text/sgml',
				'sh'	=> 'application/x-sh',
				'shar'	=> 'application/x-shar',
				'shtml'	=> 'text/html',
				'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',
				'stc'	=> 'application/vnd.sun.xml.calc.template',
				'std'	=> 'application/vnd.sun.xml.draw.template',
				'sti'	=> 'application/vnd.sun.xml.impress.template',
				'stw'	=> 'application/vnd.sun.xml.writer.template',
				'sv4cpio'	=> 'application/x-sv4cpio',
				'sv4crc'	=> 'application/x-sv4crc',
				'swf'	=> 'application/x-shockwave-flash',
				'sxc'	=> 'application/vnd.sun.xml.calc',
				'sxd'	=> 'application/vnd.sun.xml.draw',
				'sxg'	=> 'application/vnd.sun.xml.writer.global',
				'sxi'	=> 'application/vnd.sun.xml.impress',
				'sxm'	=> 'application/vnd.sun.xml.math',
				'sxw'	=> 'application/vnd.sun.xml.writer',
				't'	=> 'application/x-troff',
				'tar'	=> 'application/x-tar',
				'tcl'	=> 'application/x-tcl',
				'tex'	=> 'application/x-tex',
				'texi'	=> 'application/x-texinfo',
				'texinfo'	=> 'application/x-texinfo',
				'tgz'	=> 'application/x-gtar',
				'tif'	=> 'image/tiff',
				'tiff'	=> 'image/tiff',
				'tr'	=> 'application/x-troff',
				'tsv'	=> 'text/tab-separated-values',
				'txt'	=> 'text/plain',
				'ustar'	=> 'application/x-ustar',
				'vbs'	=> 'text/plain', //added by skwashd - for obvious reasons
				'vcd'	=> 'application/x-cdlink',
				'vcf'	=> 'text/x-vcard',
				'vcs'	=> 'text/calendar',
				'vfb'	=> 'text/calendar',
				'vrml'	=> 'model/vrml',
				'vsd'	=> 'application/vnd.visio',
				'wav'	=> 'audio/x-wav',
				'wax'	=> 'audio/x-ms-wax',
				'wbmp'	=> 'image/vnd.wap.wbmp',
				'wbxml'	=> 'application/vnd.wap.wbxml',
				'wm'	=> 'video/x-ms-wm',
				'wma'	=> 'audio/x-ms-wma',
				'wmd'	=> 'application/x-ms-wmd',
				'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',
				'wmx'	=> 'video/x-ms-wmx',
				'wmz'	=> 'application/x-ms-wmz',
				'wrl'	=> 'model/vrml',
				'wvx'	=> 'video/x-ms-wvx',
				'xbm'	=> 'image/x-xbitmap',
				'xht'	=> 'application/xhtml+xml',
				'xhtml'	=> 'application/xhtml+xml',
				'xls'	=> 'application/vnd.ms-excel',
				'xlt'	=> 'application/vnd.ms-excel',
				'xml'	=> 'application/xml',
				'xpm'	=> 'image/x-xpixmap',
				'xsl'	=> 'text/xml',
				'xwd'	=> 'image/x-xwindowdump',
				'xyz'	=> 'chemical/x-xyz',
				'z'	=> 'application/x-compress',
				'zip'	=> 'application/zip',
		);
		$type = strtolower(substr(strrchr($filename, '.'),1));
		if(isset($contentType[$type])) {
			$mime = $contentType[$type];
		}else {
			$mime = 'application/octet-stream';
		}
		return $mime;
	}
}

if(!function_exists('image_type_to_extension')){
	function image_type_to_extension($imagetype) {
		if(empty($imagetype)) return false;
		switch($imagetype) {
			case IMAGETYPE_GIF    : return '.gif';
			case IMAGETYPE_JPEG    : return '.jpg';
			case IMAGETYPE_PNG    : return '.png';
			case IMAGETYPE_SWF    : return '.swf';
			case IMAGETYPE_PSD    : return '.psd';
			case IMAGETYPE_BMP    : return '.bmp';
			case IMAGETYPE_TIFF_II : return '.tiff';
			case IMAGETYPE_TIFF_MM : return '.tiff';
			case IMAGETYPE_JPC    : return '.jpc';
			case IMAGETYPE_JP2    : return '.jp2';
			case IMAGETYPE_JPX    : return '.jpf';
			case IMAGETYPE_JB2    : return '.jb2';
			case IMAGETYPE_SWC    : return '.swc';
			case IMAGETYPE_IFF    : return '.aiff';
			case IMAGETYPE_WBMP    : return '.wbmp';
			case IMAGETYPE_XBM    : return '.xbm';
			default                : return false;
		}
	}

}