php依地理座標取得國家、省份、城市，及週邊資料類

功能：當App取得到使用者的地理座標時，可以根據座標知道使用者目前在那個國家、省份、城市，及週邊有什麼資料。

原理：基於百度Geocoding API 實現，需要先註冊百度開發者，然後申請百度AK（密鑰）
Geocoin.class.

<code><span><span><span><?php</span>
/**
 * 根据地理坐标获取国家、省份、城市，及周边数据类(利用百度Geocoding API实现)
 * 百度密钥获取方法：http://lbsyun.baidu.com/apiconsole/key?application=key（需要先注册百度开发者账号）
 * Date:    2015-07-30
 * Author:  fdipzone
 * Ver: 1.0
 *
 * Func:
 * Public  getAddressComponent 根据地址获取国家、省份、城市及周边数据
 * Private toCurl              使用curl调用百度Geocoding API
 */</span><span><span>class</span><span>Geocoding</span> {</span><span>// 百度Geocoding API</span><span>const</span> API = <span>'http://api.map.baidu.com/geocoder/v2/'</span>;

    <span>// 不显示周边数据</span><span>const</span> NO_POIS = <span>0</span>;

    <span>// 显示周边数据</span><span>const</span> POIS = <span>1</span>; 

    <span>/**
     * 根据地址获取国家、省份、城市及周边数据
     *<span> @param</span>  String  $ak        百度ak(密钥)
     *<span> @param</span>  Decimal $longitude 经度
     *<span> @param</span>  Decimal $latitude  纬度
     *<span> @param</span>  Int     $pois      是否显示周边数据
     *<span> @return</span> Array
     */</span><span>public</span><span>static</span><span><span>function</span><span>getAddressComponent</span><span>(<span>$ak</span>, <span>$longitude</span>, <span>$latitude</span>, <span>$pois</span>=self::NO_POIS)</span>{</span><span>$param</span> = <span>array</span>(
                <span>'ak'</span> => <span>$ak</span>,
                <span>'location'</span> => implode(<span>','</span>, <span>array</span>(<span>$latitude</span>, <span>$longitude</span>)),
                <span>'pois'</span> => <span>$pois</span>,
                <span>'output'</span> => <span>'json'</span>
        );

        <span>// 请求百度api</span><span>$response</span> = <span>self</span>::toCurl(<span>self</span>::API, <span>$param</span>);

        <span>$result</span> = <span>array</span>();

        <span>if</span>(<span>$response</span>){
            <span>$result</span> = json_decode(<span>$response</span>, <span>true</span>);
        }

        <span>return</span><span>$result</span>;

    }

    <span>/**
     * 使用curl调用百度Geocoding API
     *<span> @param</span>  String $url    请求的地址
     *<span> @param</span>  Array  $param  请求的参数
     *<span> @return</span> JSON
     */</span><span>private</span><span>static</span><span><span>function</span><span>toCurl</span><span>(<span>$url</span>, <span>$param</span>=array<span>()</span>)</span>{</span><span>$ch</span> = curl_init();

        <span>if</span>(substr(<span>$url</span>,<span>0</span>,<span>5</span>)==<span>'https'</span>){
            curl_setopt(<span>$ch</span>, CURLOPT_SSL_VERIFYPEER, <span>false</span>); <span>// 跳过证书检查</span>
            curl_setopt(<span>$ch</span>, CURLOPT_SSL_VERIFYHOST, <span>true</span>);  <span>// 从证书中检查SSL加密算法是否存在</span>
        }

        curl_setopt(<span>$ch</span>, CURLOPT_RETURNTRANSFER, <span>true</span>);
        curl_setopt(<span>$ch</span>, CURLOPT_URL, <span>$url</span>);
        curl_setopt(<span>$ch</span>, CURLOPT_POST, <span>true</span>);
        curl_setopt(<span>$ch</span>, CURLOPT_POSTFIELDS, http_build_query(<span>$param</span>));

        <span>$response</span> = curl_exec(<span>$ch</span>);

        <span>if</span>(<span>$error</span>=curl_error(<span>$ch</span>)){
            <span>return</span><span>false</span>;
        }

        curl_close(<span>$ch</span>);

        <span>return</span><span>$response</span>;

    }

}

<span>?></span></span></span></span></code>

範例回傳：

<code><span><?php</span><span>require</span><span>"Geocoding.class.php"</span>;

<span>$ak</span> = <span>'这里填写你的百度AK'</span>;
<span>$longitude</span> = <span>113.327782</span>;
<span>$latitude</span> = <span>23.137202</span>;

<span>$result</span> = Geocoding::getAddressComponent(<span>$ak</span>, <span>$longitude</span>, <span>$latitude</span>, Geocoding::NO_POIS);

<span>echo</span><span>'<pre class="brush:php;toolbar:false">'</span>;
print_r(<span>$result</span>);
<span>echo</span><span>'

'; ?>

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