/**
	 * 構建返回頭資訊
	 */
	private function buildHeader($retCode, $retMessage)
	{
		$retNode = new stdClass();
		$retNode->retCode = $retCode;
		$retNode->retMessage = $retMessage;
		return $retNode;
	}

	/**
	 * 成功返回資訊
	 */
	function success($body)
	{
		$head = $this->buildHeader(200, '成功');
		$ret = array(
				'Head'=>$head,
				'Body'=>$body,
			    );
		return json_encode($ret);
	}
	/**
	 * 失敗返回資訊
	 */
	function failed($retCode, $retMessage)
	{
		$head = $this->buildHeader($retCode, $retMessage);
		$ret = array(
				'Head'=>$head,
				'Body'=>array(),
			    );
		return json_encode($ret);
	}
        /**
	 * 構建成功提示資訊
	 */
	function buildFakeStatus($Message)
	{
		$retNode = new stdClass();
		$retNode->Checked=1;
		$retNode->Message=$Message;
		return $retNode;
	}
	/**
	 * post   接值
	 * @param  string  post名稱
	 * @must  bool  true 不能為空值
	 */
	function getPostString($param, $must=false)
	{
		$value = $_POST[$param];
		if($must == true)
		{
			if($value=="")
			{
				throw new Exception("$param 引數不能為空");
			}
		}
		return $value;
	}

        /**
	 * 封包輸出，確保輸出之前，將輸出格式設定為json格式
	 */
	function printJson($packageData)
	{
		header('Content-type: application/json');
		print $packageData;
	}
        /**
	 * 通用介面卡
	 */
	function adapter($params, $node)
	{
		$ret = new StdClass();
		foreach($params as $key=>$value)
		{
			$part = $node;
			$sections = explode('/', $key);
			foreach($sections as $section)
			{
				$part = $part[$section];
			}
			if(isset($part))
			{
				$ret->$value = $part;
			}
			else
			{
				$ret->$value = NULL;
			}
		}
		return $ret;
	}

	/*
	 * 去除null 變成 ''
	 * */
	function removeNull($str){
	    return	$string=$str==null?'':$str;
	}


	/**
	 * 根據陣列的某個欄位排序
	 * */
	 function arrSort($data,$field,$direction='DESC'){
		 if($direction=='asc'||$direction=='ASC'){
			 $direction='SORT_ASC';
		 }else{
			 $direction='SORT_DESC';
		 }
		$sort = array(
			'direction' => $direction, //排序順序標誌 SORT_DESC 降序；SORT_ASC 升序
			'field'     => $field,       //排序欄位
		);
		$arrSort = array();
		foreach($data AS $uniqid => $row){
			foreach($row AS $key=>$value){
				$arrSort[$key][$uniqid] = $value;
			}
		}
		if($sort['direction']){
			array_multisort($arrSort[$sort['field']], constant($sort['direction']), $data);
		}
		return $data;
	}