PHP通过气象局开放API查询指定城市（区县）天气

具体应用说不上，写这个功能纯粹为了好玩，可能在网站的小挂件里没准能用上这样的功能，或者一些生活类网站比较适用，在正式进入本话题之前，必须要通过PHP将JSON格式省市（区）二级数据插入数据库，才能进行接下来的天气查询操作，所谓巧妇难为无米之炊，斯理也。在完成省市信息入库之后，理一下实现思路：前台通过搜索框执行ajax请求，后台根据城市名称查询城市编码，然后通过城市编码组装成API接口获取该城市天气信息，返回到前台，其实还是很简单的，代码如下：

1.前台代码 weather.php:

<?php/* * author:phpxs.com * website: * url:http://www.phpxs.com/post/2945 */?><script type='text/javascript'src='https://www.haobala.com/uploads/201502/02/14228784541.js'></script><input type='text' name='city'/><button onclick='queryWeather();'>查询</button><div id='show'></div><script type='text/javascript'> function queryWeather(){$.post(’getweather.php’, {city: $('#city_name').val()}, function(data) { //optional stuff to do after success var weather = data.weatherinfo.weather1; var temp = data.weatherinfo.temp1; $('#show').html(weather+','+temp); },’json’); }</script>

2.后台代码 getweather.php:

<?php/** author:phpxs.com* website:* url:http://www.phpxs.com/post/2945*/if (isset($_POST[’city’])) { $city = $_POST[’city’]; //通过城市名称获取城市ID $pdo = new PDO(’mysql:host=localhost;dbname=test;charset=utf8’,’root’,’root’); $stmt = $pdo->prepare(’SELECT id FROM city WHERE name=:name’); $stmt->bindParam(’:name’,$city); $stmt->execute(); $cid = $stmt->fetchColumn(); //通过城市ID获取城市天气详情 $api = 'http://m.weather.com.cn/data/'.$cid.'.html'; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $api); curl_setopt($ch, CURLOPT_HEADER, false); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERAGENT, ’Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.1 Safari/537.11’); $ret = curl_exec($ch); curl_close($ch); //返回获取json格式结果 echo $ret;}else{ echo ’请输入要查询的城市名!’;}?>

3.效果演示：