1 header("Content-type: text/html; charset=utf-8");
 2 class getWeather{
 3     private $ak;
 4     
 5     public function __construct($ak){
 6         if($ak){
 7             $this->ak=$ak;
 8         } else {
 9             die(‘參數錯誤‘);exit;
10         }
11         
12     }
13     
14     /**
 
15      * 獲取城市名稱
16      * @param string $ip ip地址(必須為有效ip)
17      * return string $city  城市名稱，如武漢
18     */
19     public function getCity($ip=‘‘){
20         if(!$ip){
21             $ip=$this->get_client_ip();
22         }
23         $ak=$this->ak;
24         $content = file_get_contents("http://api.map.baidu.com/location/ip?ak=$ak
 
&ip=$ip&coor=bd09ll");
25         $json = json_decode($content,true);
26         $address=$json[‘address‘];
27         $cityarr=explode("|", $address);
28         $city=$cityarr[‘2‘];//不帶"市",如"武漢",而不是"武漢市"
29         return $city;
30     }
31     
32     /**
33      * 獲取天氣預報信息
34      * @param string $city  城市名稱，如武漢
 
35      * return array $data 天氣信息 
36     */
37     public function weatherInfo($city=‘‘){
38         if(!$city){
39             $city=$this->getCity();
40         }
41         $content1=urlencode(mb_convert_encoding($city, ‘gb2312‘, ‘utf-8‘)); 
42         $weather=file_get_contents("http://php.weather.sina.com.cn/xml.php?city=$content1&password=DJOYnieT8234jlsK&day=0");
43         $ob= simplexml_load_string($weather);
44         $json  = json_encode($ob);
45         $data = json_decode($json, true);
46         return $data;
47     }
48     /**
49     *獲取ip
50     */
51     public function get_client_ip(){
52         if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")){
53             $ip = getenv("HTTP_CLIENT_IP");
54         }else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")){
55             $ip = getenv("HTTP_X_FORWARDED_FOR");
56         }else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
57             $ip = getenv("REMOTE_ADDR");
58         else if (isset($_SERVER[‘REMOTE_ADDR‘]) && $_SERVER[‘REMOTE_ADDR‘] && strcasecmp($_SERVER[‘REMOTE_ADDR‘], "unknown"))
59             $ip = $_SERVER[‘REMOTE_ADDR‘];
60         else
61             $ip = "unknown";
62         return($ip);
63     }
64 }
65 $baiduak=‘你的密鑰‘;//百度地圖api的密鑰
66 $wea=new getWeather($baiduak);
67 $json=$wea->weatherInfo();
68 print_r($json);exit;

php定位並且獲取天氣信息