读取目录下文件

    /**
     * 读取文件
     * @param $dirname
     * @param $ext
     * @return array
     */
    public static function scan_dir($dirname, $ext = "json")
    {
        $result = array();
        if (is_dir($dirname)) {
            if ($fp = @opendir($dirname)) {
                $files = array();
                //读取
                while (($file = readdir($fp)) !== false) {
                    if ($file != '.' && $file != '..' && $file != '.svn') {
                        if (is_file($dirname . $file)) {
                            $extName = new SplFileInfo($file);
                            if ($extName->getExtension() == $ext) {
                                $files[] = $file;
                            }
                        }
                    }
                }
                $result = $files;
                closedir($fp);
            }
        }
        return $result;
    }