php转换字符串编码

// 转换字符串编码为 UTF8
function conv2utf8($data){
    $fileType = mb_detect_encoding($data , array('UTF-8','GBK','LATIN1','BIG5')) ;
        if( $fileType != 'UTF-8'){
        $data = mb_convert_encoding($data ,'utf-8' , $fileType);
    }
    return $data;
}