我想通过mb_detect_encoding()函数动态获取某个字符的编码集,再通过iconv进行编码转换，但是mb_detect_encoding()判断的编码类型不准，导致iconv()失效或乱码。

//片段
if (is_string($k)) {
    $encoding = getEncoding($k);
    $k = iconv($encoding, "utf-8", $k);
}
//获取编码集
function getEncoding($data)
{
   return mb_detect_encoding($data, array("ASCII","GB2312","GBK",'BIG5','UTF-8'));
}
//测试
$k = "哈哈";
$encoding = getEncoding($k);
var_dump($encoding,$k);
$k = iconv($encoding, "utf-8", $k);
var_dump(getEncoding($k),$k);exit;

//输出：string(5) "CP936" string(6) "哈哈" string(5) "CP936" string(9) "鍝堝搱"