数组混合GBK、UTF-8 互相转换

/**
	 * 数组混合GBK、UTF-8 换转为UTF-8
	 * @param unknown_type $arr
	 */
	static function gbktoutf8($arr){
		if(is_array($arr) && count($arr)){
			foreach($arr as $key=>$value){
				if(is_array($value)){
					$arrRs[$key] = gbktoutf8($value);
				}else{
					if(!is_utf8($value)){
						$arrRs[$key] = iconv('GBK','UTF-8',$value);
					}else{
						$arrRs[$key] = $value;
					}
				}
			}
			return $arrRs;
		}
		return null;
	}

	/**
	 * 数组混合GBK、UTF-8 换转为gbk
	 * @param array $arr 目标数组
	 */
	static function utf8togbk($arr){
		if(is_array($arr) && count($arr)){
			foreach($arr as $key=>$value){
				if(is_array($value)){
					$arrRs[$key] = utf8togbk($value);
				}else{
					//判断字符编码是否utf8字符(如果不是utf8字符则转换)
					if(is_utf8($value)){
						$arrRs[$key] = iconv('UTF-8','GBK',$value);
					}else{
						$arrRs[$key] = $value;
					}
				}
			}
			return $arrRs;
		}
		return 0;
	}