關於方維的ip定位作法

最近在作關於方維的項目，方維的根據ip定位思路大概是這樣的，在路由分發控制器前載入了一個叫作user_init.php的文件，查看這我的第一次訪問時cookie裏面和url裏面是否有關於城市的記錄，若是沒有的話，自動跳到城市選擇頁，

//首次訪問跳轉到城市選擇
if(!isset($_REQUEST['act']) && intval(a_fanweC("FIRST_VISIT_CITY"))==1&&!isset($_COOKIE['had_select_city'])&&!isset($_REQUEST['cityname']) && strtolower($_REQUEST['m'])=="index"){
	redirect2(a_u("City/more"));

}

而後封裝了一個叫getCurrentCityID的函數。若是url沒有傳城市時，就從cookie裏的歷史記錄裏面去找。若是cookie裏面沒有歷史記錄的話，就調用一個根據ip地址定位所在城市，而後傳入session裏。

function getCurrentCityID(){
 
	if(!empty($_REQUEST['cityname']))
	{
		$cityName = trim($_REQUEST['cityname']);
		$currentCity = $GLOBALS['db']->getRowCached("SELECT id,py FROM ".DB_PREFIX."group_city where py = '".$cityName."' and verify=1 and status =1");
		if($currentCity){
			setcookie('cityID',base64_encode(serialize($currentCity['id'])));
			$_SESSION['cityID'] = $currentCity['id'];
			$_SESSION['cityName'] = $currentCity['py'];
			
			return $currentCity['id'];				
		}
	}
		
	$cityID = intval($_SESSION["cityID"]);
	
	if($cityID > 0){
		return $cityID;
	}
				
	if ($cityID==0){
		$cityID = intval(unserialize(base64_decode($_COOKIE['cityID'])));			
	}

 	//動態定位
 	if($cityID==0)
	{			
		//$ip =  get_ip(); 
		$city_list = $GLOBALS['db']->getAllCached("SELECT id,name FROM ".DB_PREFIX."group_city where status =1 and verify = 1 order by pid desc");
		//加入自動定位
		foreach ($city_list as $city)
		{
			//if(@strpos($address['area1'],$city['name']))
			if(strstr($address['area1'],$city['name'])!=false||strstr($city['name'],$address['area1'])!=false)
			{
				$city_sub = $GLOBALS['db']->getRow("SELECT id,name,py FROM ".DB_PREFIX."group_city where status =1 and verify= 1 and pid =".$city['id']." order by sort");
				if ($city_sub){
					$cityID = $city_sub['id'];	
				}else{
					$cityID = $city['id'];	
				}				
				break;
			}
		}
	}

	if($cityID > 0)
		$currentCity = $GLOBALS['db']->getRowCached("SELECT id,py FROM ".DB_PREFIX."group_city where id = $cityID and verify=1 and status =1");
		
	if(empty($currentCity))
		$currentCity = $GLOBALS['db']->getRowCached("SELECT id,py FROM ".DB_PREFIX."group_city where is_defalut=1 and verify=1 and status =1");

	setcookie('cityID',base64_encode(serialize($currentCity['id'])));	
	$_SESSION['cityID'] = $currentCity['id'];
	$_SESSION['cityName'] = $currentCity['py'];
		
	return $currentCity['id'];		
}

//獲取當前城市跟客戶端IP
if(!isset($_SESSION['CLIENT_IP']) || empty($_SESSION['C_CITY_ID']) ||(isset($_REQUEST['cityname']) && !empty($_REQUEST['cityname'])))
{
	require ROOT_PATH.'app/source/class/IpLocation.class.php';
	define("C_CITY_ID",getCurrentCityID());

	$_SESSION['C_CITY_ID'] = C_CITY_ID;
	
	$iplocation = new IpLocation();
	$client_ip = $iplocation->getIP();
	$_SESSION['CLIENT_IP'] = $client_ip;
	
	if(intval(a_fanweC("FIRST_VISIT_CITY"))==1&&isset($_REQUEST['cityname']) && !isset($_COOKIE['had_select_city'])){
		setcookie('had_select_city',true,time()+365*60*60*24);
	}
}

最後完成獲取地址定位的操做。