php 获取参数编码格式并转换成utf-8

$encode = mb_detect_encoding($zhuanye, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5')); //获取编码格式
if($encode !='UTF-8' || $encode != "utf-8"){
    $zhuanye =  mb_convert_encoding($zhuanye, 'UTF-8', $encode); //编码转为utf-8
}