php将编码转换为UTF8

主要用于编码不统一导致出现乱码的情况，此函数会自动监测非UTF8编码转成UTF8编码。

functionConverCode($str){
$encode=mb_detect_encoding($str,array("ASCII",'UTF-8',"GB2312","GBK",'BIG5'));
$newstr=mb_convert_encoding($str,'UTF-8',$encode);
return$newstr;
}