php字符串编码转换函数mb_detect_encoding - 代码库

$str字符串

把$beforeEncode编码转变为$afterEncode

原理：验证字符串编码是否为$beforeEncode，如果是就转变为$afterEncode，如果不是$beforeEncode编码格式，那么查询当前字符串编码格式，然后在转为$afterEncode

array("ASCII","UTF-8","GB2312","GBK","BIG5")自己可以扩充此数组中的编码

function iconvStr($str,$beforeEncode,$afterEncode){

$postXml = '';

$encode = mb_detect_encoding($str, array("ASCII","UTF-8","GB2312","GBK","BIG5"));

if($encode == $beforeEncode){

$postXml = iconv($beforeEncode,$afterEncode,$str);

}else{

$postXml = iconv($encode,$afterEncode,$str);

}

return $postXml;

}