php利用百度地图API进行IP定位和GPS定位

最近在做一个手机端的webapp地图应用，而核心内容当然是定位了，但是定位的话有几种方式，IP定位,GPS定位，基站定位（这个貌似webapp用不了）， 那么剩下核心的gps定位和ip定位了，我们知道，html5有定位API，但是该API拿到的GPS数据是硬件坐标，无法直接显示在地图上。 后来上百度LBS云看到有地图IP定位API和GPS坐标转换API，地址：http://developer.baidu.com/map/ 百度地图API的调用需要申请KEY，这里就不具体介绍了，直接贴上本人写了两个关键方法，为了方便前台调用，返回数据采用以下格式  

{    address: "北京市海淀区西二旗北路",    province: "北京市",    city: "北京市",    street: "西二旗北路",    street_number: "",    city_code: 131,    lng: 116.3207676804,    lat: 40.064084055578}

核心类

<?php /** * @author xialei  */class map{ private static $_instance;  const REQ_GET = 1; const REQ_POST = 2;  /**  * 单例模式  * @return map  */ public static function instance() {  if (!self::$_instance instanceof self)  {   self::$_instance = new self;  }  return self::$_instance; }  /**  * 执行CURL请求  * @author: xialei  * @param $url  * @param array $params  * @param bool $encode  * @param int $method  * @return mixed  */ private function async($url, $params = array(), $encode = true, $method = self::REQ_GET) {  $ch = curl_init();  if ($method == self::REQ_GET)  {   $url = $url . '?' . http_build_query($params);   $url = $encode ? $url : urldecode($url);   curl_setopt($ch, CURLOPT_URL, $url);  }  else  {   curl_setopt($ch, CURLOPT_URL, $url);   curl_setopt($ch, CURLOPT_POST, true);   curl_setopt($ch, CURLOPT_POSTFIELDS, $params);  }  curl_setopt($ch, CURLOPT_REFERER, '百度地图referer');  curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (iPhone; CPU iPhone OS 7_0 like Mac OS X; en-us) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11A465 Safari/9537.53');  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  $resp = curl_exec($ch);  curl_close($ch);  return $resp; }  /**  * ip定位  * @param string $ip  * @return array  * @throws Exception  */ public function locationByIP($ip) {  //检查是否合法IP  if (!filter_var($ip, FILTER_VALIDATE_IP))  {   throw new Exception('ip地址不合法');  }  $params = array(    'ak' => '百度地图API KEY',    'ip' => $ip,    'coor' => 'bd09ll'//百度地图GPS坐标  );  $api = 'http://api.map.baidu.com/location/ip';  $resp = $this->async($api, $params);  $data = json_decode($resp, true);  //有错误  if ($data['status'] != 0)  {   throw new Exception($data['message']);  }  //返回地址信息  return array(    'address' => $data['content']['address'],    'province' => $data['content']['address_detail']['province'],    'city' => $data['content']['address_detail']['city'],    'district' => $data['content']['address_detail']['district'],    'street' => $data['content']['address_detail']['street'],    'street_number' => $data['content']['address_detail']['street_number'],    'city_code' => $data['content']['address_detail']['city_code'],    'lng' => $data['content']['point']['x'],    'lat' => $data['content']['point']['y']  ); }   /**  * GPS定位  * @param $lng  * @param $lat  * @return array  * @throws Exception  */ public function locationByGPS($lng, $lat) {  $params = array(    'coordtype' => 'wgs84ll',    'location' => $lat . ',' . $lng,    'ak' => '百度地图API KEY',    'output' => 'json',    'pois' => 0  );  $resp = $this->async('http://api.map.baidu.com/geocoder/v2/', $params, false);  $data = json_decode($resp, true);  if ($data['status'] != 0)  {   throw new Exception($data['message']);  }  return array(    'address' => $data['result']['formatted_address'],    'province' => $data['result']['addressComponent']['province'],    'city' => $data['result']['addressComponent']['city'],    'street' => $data['result']['addressComponent']['street'],    'street_number' => $data['result']['addressComponent']['street_number'],    'city_code'=>$data['result']['cityCode'],    'lng'=>$data['result']['location']['lng'],    'lat'=>$data['result']['location']['lat']  ); }}

调用方法就不说了。稍微看一下源代码就可以知道的