Malformed UTF-8 characters, possibly incorrectly encoded 或中文乱码 （Uncaught InvalidArgumentException: Malformed UTF-8 characters, possibly incorrectly encoded in）

问题： Uncaught InvalidArgumentException: Malformed UTF-8 characters, possibly incorrectly encoded in

是返回的数据有特殊字符，编码转换回来就好了

mb_convert_encoding($value, 'UTF-8', 'UTF-8');

中文乱码可以用以下方法转码

$content = mb_convert_encoding( $result, 'UTF-8', 'UTF-8,GBK,GB2312,BIG5' );

意思就是把UTF-8,GBK,GB2312,BIG5这几种编码转成UTF-8编码。