php转换字符编码为utf-8
function strToUtf8($str){
$encode = mb_detect_encoding($str, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5'));
if($encode == 'UTF-8'){
return $str;
}else{
return mb_convert_encoding($str, 'UTF-8', $encode);
}
}
