这段代码是ThinkPHP框架中的，感觉很常用，所以单独拎出来，大家共同学习一下。

functionauto_charset($fContents,$from=’’,$to=’’)
{
if(strtoupper($from)===strtoupper($to)||empty($fContents)||(is_scalar($fContents)&&!is_string($fContents))){
//如果编码相同或者非字符串标量则不转换
return$fContents;
}
$from=strtoupper($from)==’UTF8’?’utf-8’:$from;
$to=strtoupper($to)==’UTF8’?’utf-8’:$to;
if(is_string($fContents)){
if(function_exists(’mb_convert_encoding’)){
returnmb_convert_encoding($fContents,$to,$from);
}elseif(function_exists(’iconv’)){
returniconv($from,$to,$fContents);
}else{
exit(’转换失败’);
return$fContents;
}
}
elseif(is_array($fContents)){
foreach($fContentsas$key=>$val){
$_key=auto_charset($key,$from,$to);
$fContents[$_key]=auto_charset($val,$from,$to);
if($key!=$_key){
unset($fContents[$key]); [Page]
}
}
return$fContents;
}
elseif(is_object($fContents)){
$vars=get_object_vars($fContents);
foreach($varsas$key=>$val){
$fContents->$key=auto_charset($val,$from,$to);
}
return$fContents;
}
else{
return$fContents;
}
}