php中循环实现(字符串，对象，或者数组)编码相互

/**
 * 循环实现编码互转
 *
 * @param string $param(字符串，对象，或者数组)，$currCharset当前编码，$toCharset期望编码
 * @return 参数类型
 */
function zhandi_iconv($param,$currCharset,$toCharset){
 if ($currCharset != $toCharset){
  if (is_string($param)){
   return iconv($currCharset, $toCharset, $param);
  }
  elseif (is_array($param)){
   foreach ($param as $key => $value){
    $param[$key] = zhandi_iconv($value);
   }
   return $param;
  }
  elseif (is_object($param)){
   foreach ($param as $key => $value){
    $param->$key = zhandi_iconv($value);
   }
   return $param;
  }
  else{
   return $param;
  }
 }
 return $param;
}