文件MIME类型获取

文件MIME类型获取              

<?php
$mime = array (
		//applications
		&#39;ai&#39;    => &#39;application/postscript&#39;,
		&#39;eps&#39;   => &#39;application/postscript&#39;,
		&#39;exe&#39;   => &#39;application/octet-stream&#39;,
		&#39;doc&#39;   => &#39;application/vnd.ms-word&#39;,
		&#39;xls&#39;   => &#39;application/vnd.ms-excel&#39;,
		&#39;ppt&#39;   => &#39;application/vnd.ms-powerpoint&#39;,
		&#39;pps&#39;   => &#39;application/vnd.ms-powerpoint&#39;,
		&#39;pdf&#39;   => &#39;application/pdf&#39;,
		&#39;xml&#39;   => &#39;application/xml&#39;,
		&#39;odt&#39;   => &#39;application/vnd.oasis.opendocument.text&#39;,
		&#39;swf&#39;   => &#39;application/x-shockwave-flash&#39;,
		// archives
		&#39;gz&#39;    => &#39;application/x-gzip&#39;,
		&#39;tgz&#39;   => &#39;application/x-gzip&#39;,
		&#39;bz&#39;    => &#39;application/x-bzip2&#39;,
		&#39;bz2&#39;   => &#39;application/x-bzip2&#39;,
		&#39;tbz&#39;   => &#39;application/x-bzip2&#39;,
		&#39;zip&#39;   => &#39;application/zip&#39;,
		&#39;rar&#39;   => &#39;application/x-rar&#39;,
		&#39;tar&#39;   => &#39;application/x-tar&#39;,
		&#39;7z&#39;    => &#39;application/x-7z-compressed&#39;,
		// texts
		&#39;txt&#39;   => &#39;text/plain&#39;,
		&#39;php&#39;   => &#39;text/x-php&#39;,
		&#39;html&#39;  => &#39;text/html&#39;,
		&#39;htm&#39;   => &#39;text/html&#39;,
		&#39;js&#39;    => &#39;text/javascript&#39;,
		&#39;css&#39;   => &#39;text/css&#39;,
		&#39;rtf&#39;   => &#39;text/rtf&#39;,
		&#39;rtfd&#39;  => &#39;text/rtfd&#39;,
		&#39;py&#39;    => &#39;text/x-python&#39;,
		&#39;java&#39;  => &#39;text/x-java-source&#39;,
		&#39;rb&#39;    => &#39;text/x-ruby&#39;,
		&#39;sh&#39;    => &#39;text/x-shellscript&#39;,
		&#39;pl&#39;    => &#39;text/x-perl&#39;,
		&#39;sql&#39;   => &#39;text/x-sql&#39;,
		// images
		&#39;bmp&#39;   => &#39;image/x-ms-bmp&#39;,
		&#39;jpg&#39;   => &#39;image/jpeg&#39;,
		&#39;jpeg&#39;  => &#39;image/jpeg&#39;,
		&#39;gif&#39;   => &#39;image/gif&#39;,
		&#39;png&#39;   => &#39;image/png&#39;,
		&#39;tif&#39;   => &#39;image/tiff&#39;,
		&#39;tiff&#39;  => &#39;image/tiff&#39;,
		&#39;tga&#39;   => &#39;image/x-targa&#39;,
		&#39;psd&#39;   => &#39;image/vnd.adobe.photoshop&#39;,
		//audio
		&#39;mp3&#39;   => &#39;audio/mpeg&#39;,
		&#39;mid&#39;   => &#39;audio/midi&#39;,
		&#39;ogg&#39;   => &#39;audio/ogg&#39;,
		&#39;mp4a&#39;  => &#39;audio/mp4&#39;,
		&#39;wav&#39;   => &#39;audio/wav&#39;,
		&#39;wma&#39;   => &#39;audio/x-ms-wma&#39;,
		// video
		&#39;avi&#39;   => &#39;video/x-msvideo&#39;,
		&#39;dv&#39;    => &#39;video/x-dv&#39;,
		&#39;mp4&#39;   => &#39;video/mp4&#39;,
		&#39;mpeg&#39;  => &#39;video/mpeg&#39;,
		&#39;mpg&#39;   => &#39;video/mpeg&#39;,
		&#39;mov&#39;   => &#39;video/quicktime&#39;,
		&#39;wm&#39;    => &#39;video/x-ms-wmv&#39;,
		&#39;flv&#39;   => &#39;video/x-flv&#39;,
		&#39;mkv&#39;   => &#39;video/x-matroska&#39;
		);

function _getMimeDetect() {
	if (class_exists(&#39;finfo&#39;)) {
		return &#39;finfo&#39;;
	} else if (function_exists(&#39;mime_content_type&#39;)) {
		return &#39;mime_content_type&#39;;
	} else if ( function_exists(&#39;exec&#39;)) {
		$result = exec(&#39;file -ib &#39;.escapeshellarg(__FILE__));
		if ( 0 === strpos($result, &#39;text/x-php&#39;) OR 0 === strpos($result, &#39;text/x-c++&#39;)) {
			return &#39;linux&#39;;
		}
		$result = exec(&#39;file -Ib &#39;.escapeshellarg(__FILE__));
		if ( 0 === strpos($result, &#39;text/x-php&#39;) OR 0 === strpos($result, &#39;text/x-c++&#39;)) {
			return &#39;bsd&#39;;
		}
	}
	return &#39;internal&#39;;
}

function _getMimeType($path) {
	global $mime;
	$fmime = _getMimeDetect();
	switch($fmime) {
		case &#39;finfo&#39;:
			$finfo = finfo_open(FILEINFO_MIME);
			if ($finfo) 
				$type = @finfo_file($finfo, $path);
			break;
		case &#39;mime_content_type&#39;:
			$type = mime_content_type($path);
			break;
		case &#39;linux&#39;:
			$type = exec(&#39;file -ib &#39;.escapeshellarg($path));
			break;
		case &#39;bsd&#39;:
			$type = exec(&#39;file -Ib &#39;.escapeshellarg($path));
			break;
		default:
			$pinfo = pathinfo($path);
			$ext = isset($pinfo[&#39;extension&#39;]) ? strtolower($pinfo[&#39;extension&#39;]) : &#39;&#39;;
			$type = isset($mime[$ext]) ? $mime[$ext] : &#39;unkown&#39;;
			break;
	}
	$type = explode(&#39;;&#39;, $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$path时会返回&#39;application/octet-stream&#39;
	if ($fmime != &#39;internal&#39; AND $type[0] == &#39;application/octet-stream&#39;) {
		$pinfo = pathinfo($path); 
		$ext = isset($pinfo[&#39;extension&#39;]) ? strtolower($pinfo[&#39;extension&#39;]) : &#39;&#39;;
		if (!empty($ext) AND !empty($mime[$ext])) {
			$type[0] = $mime[$ext];
		}
	}
	
	return $type[0];
}

$path = &#39;1.txt&#39;;  //实际上当前路径并不存在1.txt
var_dump(_getMimeType($path));

/*End of php*/

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