linux环境下pathinfo 工作失败的改进函数

function path_info($path, $type = null) {
    $pathinfo = str_replace('%2F', '/', rawurlencode($path));
    $pathinfo = pathinfo($pathinfo);
    if($pathinfo){
        foreach($pathinfo as $key => $val){
           $pathinfo[$key] = rawurldecode($val);
        }
    }

    switch ($type) {
        case PATHINFO_DIRNAME:
            return $pathinfo["dirname"];
        case PATHINFO_BASENAME:
            return $pathinfo["basename"];
        case PATHINFO_FILENAME:
            return $pathinfo["filename"];
        case PATHINFO_EXTENSION:
            return $pathinfo["extension"];
        default :
            return $pathinfo;
    }

}