php

001
<?php
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$mime = array (
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        //applications
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        'ai'    => 'application/postscript',
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        'eps'   => 'application/postscript',
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        'exe'   => 'application/octet-stream',
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        'doc'   => 'application/vnd.ms-word',
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        'xls'   => 'application/vnd.ms-excel',
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        'ppt'   => 'application/vnd.ms-powerpoint',
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        'pps'   => 'application/vnd.ms-powerpoint',
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        'pdf'   => 'application/pdf',
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        'xml'   => 'application/xml',
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        'odt'   => 'application/vnd.oasis.opendocument.text',
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        'swf'   => 'application/x-shockwave-flash',
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        // archives
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        'gz'    => 'application/x-gzip',
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        'tgz'   => 'application/x-gzip',
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        'bz'    => 'application/x-bzip2',
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        'bz2'   => 'application/x-bzip2',
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        'tbz'   => 'application/x-bzip2',
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        'zip'   => 'application/zip',
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        'rar'   => 'application/x-rar',
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        'tar'   => 'application/x-tar',
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        '7z'    => 'application/x-7z-compressed',
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        // texts
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        'txt'   => 'text/plain',
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        'php'   => 'text/x-php',
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        'html'  => 'text/html',
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        'htm'   => 'text/html',
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        'js'    => 'text/javascript',
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        'css'   => 'text/css',
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        'rtf'   => 'text/rtf',
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        'rtfd'  => 'text/rtfd',
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        'py'    => 'text/x-python',
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        'java'  => 'text/x-java-source',
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        'rb'    => 'text/x-ruby',
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        'sh'    => 'text/x-shellscript',
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        'pl'    => 'text/x-perl',
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        'sql'   => 'text/x-sql',
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        // images
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        'bmp'   => 'image/x-ms-bmp',
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        'jpg'   => 'image/jpeg',
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        'jpeg'  => 'image/jpeg',
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        'gif'   => 'image/gif',
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        'png'   => 'image/png',
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        'tif'   => 'image/tiff',
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        'tiff'  => 'image/tiff',
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        'tga'   => 'image/x-targa',
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        'psd'   => 'image/vnd.adobe.photoshop',
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        //audio
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        'mp3'   => 'audio/mpeg',
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        'mid'   => 'audio/midi',
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        'ogg'   => 'audio/ogg',
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        'mp4a'  => 'audio/mp4',
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        'wav'   => 'audio/wav',
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        'wma'   => 'audio/x-ms-wma',
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        // video
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        'avi'   => 'video/x-msvideo',
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        'dv'    => 'video/x-dv',
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        'mp4'   => 'video/mp4',
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        'mpeg'  => 'video/mpeg',
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        'mpg'   => 'video/mpeg',
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        'mov'   => 'video/quicktime',
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        'wm'    => 'video/x-ms-wmv',
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        'flv'   => 'video/x-flv',
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        'mkv'   => 'video/x-matroska'
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        );
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function _getMimeDetect() {
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    if (class_exists('finfo')) {
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        return 'finfo';
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    } else if (function_exists('mime_content_type')) {
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        return 'mime_content_type';
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    } else if ( function_exists('exec')) {
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        $result = exec('file -ib '.escapeshellarg(__FILE__));
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        if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
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            return 'linux';
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        }
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        $result = exec('file -Ib '.escapeshellarg(__FILE__));
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        if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
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            return 'bsd';
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        }
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    }
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    return 'internal';
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}
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function _getMimeType($path) {
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    global $mime;
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    $fmime = _getMimeDetect();
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    switch($fmime) {
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        case 'finfo':
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            $finfo = finfo_open(FILEINFO_MIME);
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            if ($finfo)
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                $type = @finfo_file($finfo, $path);
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            break;
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        case 'mime_content_type':
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            $type = mime_content_type($path);
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            break;
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        case 'linux':
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            $type = exec('file -ib '.escapeshellarg($path));
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            break;
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        case 'bsd':
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            $type = exec('file -Ib '.escapeshellarg($path));
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            break;
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        default:
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            $pinfo = pathinfo($path);
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            $ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
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            $type = isset($mime[$ext]) ? $mime[$ext] : 'unkown';
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            break;
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    }
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    $type = explode(';', $type);
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    //需要加上这段，因为如果使用mime_content_type函数来获取一个不存在的$path时会返回'application/octet-stream'
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    if ($fmime != 'internal' AND $type[0] == 'application/octet-stream') {
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        $pinfo = pathinfo($path);
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        $ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
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        if (!empty($ext) AND !empty($mime[$ext])) {
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            $type[0] = $mime[$ext];
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        }
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    }
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    return $type[0];
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}
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$path = '1.txt';  //实际上当前路径并不存在1.txt
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var_dump(_getMimeType($path));
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/*End of php*/
http://baike.baidu.com/view/160611.htm

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