php自动获取字符串编码函数mb_detect_encoding

当在php中使用mb_detect_encoding函数进行编码识别时，很多人都碰到过识别编码有误的问题，例如对与GB2312和UTF- 8，或者UTF-8和GBK(这里主要是对于cp936的判断),网上说是由于字符短是，mb_detect_encoding会出现误判。
例如:

复制代码 代码如下:

$encode = mb_detect_encoding($keytitle, array("ASCII",'UTF-8′,"GB2312′,"GBK",'BIG5′));
if ($encode == “UTF-8″){
$keytitle = iconv("UTF-8″,"GBK",$keytitle);
}

复制代码 代码如下:

$encode = mb_detect_encoding($keytitle, array('ASCII','GB2312′,'GBK','UTF-8');