php 判断网页是否是utf8编码的方法

//判断编码复制代码 代码如下:$encode = mb_detect_encoding($q, array(‘GB2312′,’GBK’,’UTF-8′));echo $encode.”<br>”;if($encode==”GB2312″){    $q = iconv(“GBK”,”UTF-8″,$q);}else if($encode==”GBK”){    $q = iconv(“GBK”,”UTF-8″,$q);}else if($encode==”EUC-CN”){    $q = iconv(“GBK”,”UTF-8″,$q);}else//CP936{    //$q = i