<?php

namespace util\Dxcyber409;

/** MimetypeUtil class, 用于检测文件的mime类型
*   Date:   2013-09-25
*   Author: DXCyber409
*   Ver:    1.0
*
*   Func:
*   public  get_mime_typeName     获取文件mime类型
*/
class MimetypeUtil {

    //定义mime类型，当外部函数失效时备用
    private $mimeType = array(
        //applications(应用类型)
        'ai' => 'application/postscript',
        'eps' => 'application/postscript',
        'exe' => 'application/octet-stream',
        'doc' => 'application/vnd.ms-word',
        'xls' => 'application/vnd.ms-excel',
        'pdf' => 'application/pdf',
        'xml' => 'application/xml',
        'ppt' => 'application/vnd.ms-powerpoint',
        'pps' => 'application/vnd.ms-powerpoint',
        'odt' => 'application/vnd.oasis.opendocument.text',
        'swf' => 'application/x-shockwave-flash',
        //archives(档案类型)
        'gz' => 'application/x-gzip',
        'tgz' => 'application/x-gzip',
        'zip' => 'application/zip',
        'rar' => 'application/x-rar',
        'tar' => 'application/x-tar',
        'bz' => 'application/x-bzip2',
        'bz2' => 'application/x-bzip2',
        'tbz' => 'application/x-bzip2',
        '7z' => 'application/x-7z-compressed',
        //texts(文本类型)
        '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',
        'pl' => 'text/x-perl',
        'sql' => 'text/x-sql',
        'rb' => 'text/x-ruby',
        'sh' => 'text/x-shellscript',
        //images(图片类型)
        '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(音频类型)
        'mp3' => 'audio/mpeg',
        'mid' => 'audio/midi',
        'ogg' => 'audio/ogg',
        'mp4a' => 'audio/mp4',
        'wav' => 'audio/wav',
        'wma' => 'audio/x-ms-wma',
        //video(视频类型)
        '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'
    );

    /**
     * 侦测调用函数
     * @return string
     */
    private function check_function_type() {
        if (class_exists('finfo')) {
            return 'finfo';
        } else if (function_exists('mime_content_type')) {
            return 'mime_content_type';
        } else if (function_exists('exec')) {
            //linux
            $result = exec('file -ib ' . escapeshellarg(__FILE__));
            if (0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
                return 'linux';
            }

            //unix
            $result = exec('file -Ib ' . escapeshellarg(__FILE__));
            if (0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
                return 'bsd';
            }
        }
        return 'internal';
    }

    /**
     * 获取文件mime函数
     * @return string 返回mime类型
     */
    public function get_mime_typeName($filePath) {
        //获取函数类型
        $filemime = $this->check_function_type();

        //分支判断
        switch ($filemime) {
            case 'finfo':
                $finfo = finfo_open(FILEINFO_MIME);
                if ($finfo) {
                    $type = @finfo_file($finfo, $filePath);
                }
                break;
            case 'mime_content_type':
                $type = mime_content_type($filePath);
                break;
            case 'linux':
                $type = exec('file -ib ' . escapeshellarg($filePath));
                break;
            case 'bsd':
                $type = exec('file -Ib ' . escapeshellarg($filePath));
                break;
            default:
                $pinfo = pathinfo($filePath);
                $ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
                $type = isset($this->mimeType[$ext]) ? $this->mimeType[$ext] : 'unkown';
                break;
        }

        //将以分号连接的字符串分割为数组
        $type = explode(';', $type);

        //防止mime_content_type函数获取一个不存在的文件，而返回'application/octet-stream'类型
        if ($filemime != 'internal' && $type[0] == 'application/octet-stream') {
            $pinfo = pathinfo($filePath);
            $ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
            if (!empty($ext) && !empty($this->mimeType[$ext])) {
                $type[0] = $this->mimeType[$ext];
            }
        }

        return $type[0];
    }

    /**
     * 使用示例
     */
    public function demo() {
        //网站根目录路径，自行改名实际存在的文件运行
        $filepath = $_SERVER['DOCUMENT_ROOT'] . '/test.php';
        $filepath2 = $_SERVER['DOCUMENT_ROOT'] . '/123.jpg';
        $mimeUtil = new MimetypeUtil();
        var_dump($mimeUtil->get_mime_typeName($filepath));
    }
}