php获取文件MIME类型

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<?php
$mime = array (
        //applications
        'ai'    => '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-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*/

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