elFinder::detectFileExtension PHP Метод

    protected function detectFileExtension($path)
    {
        static $type, $finfo, $volume;
        if (!$type) {
            $keys = array_keys($this->volumes);
            $volume = $this->volumes[$keys[0]];
            if (class_exists('finfo', false)) {
                $tmpFileInfo = explode(';', finfo_file(finfo_open(FILEINFO_MIME), __FILE__));
            } else {
                $tmpFileInfo = false;
            }
            $regexp = '/text\\/x\\-(php|c\\+\\+)/';
            if ($tmpFileInfo && preg_match($regexp, array_shift($tmpFileInfo))) {
                $type = 'finfo';
                $finfo = finfo_open(FILEINFO_MIME);
            } elseif (function_exists('mime_content_type') && preg_match($regexp, array_shift(explode(';', mime_content_type(__FILE__))))) {
                $type = 'mime_content_type';
            } elseif (function_exists('getimagesize')) {
                $type = 'getimagesize';
            } else {
                $type = 'none';
            }
        }
        $mime = '';
        if ($type === 'finfo') {
            $mime = finfo_file($finfo, $path);
        } elseif ($type === 'mime_content_type') {
            $mime = mime_content_type($path);
        } elseif ($type === 'getimagesize') {
            if ($img = getimagesize($path)) {
                $mime = $img['mime'];
            }
        }
        if ($mime) {
            $mime = explode(';', $mime);
            $mime = trim($mime[0]);
            if (in_array($mime, array('application/x-empty', 'inode/x-empty'))) {
                // finfo return this mime for empty files
                $mime = 'text/plain';
            } elseif ($mime == 'application/x-zip') {
                // http://elrte.org/redmine/issues/163
                $mime = 'application/zip';
            }
        }
        $ext = $mime ? $volume->getExtentionByMime($mime) : '';
        return $ext ? '.' . $ext : '';
    }