PHP利⽤天⽓API获取天⽓信息中国天⽓⽹提供了⼀些查询天⽓的API，访问时返回天⽓信息的JSON格式数据，解析就可以得到天⽓信息：
后⾯⼀串数字为城市代码。
返回的utf-8字符串
{"weatherinfo":{"city":"东莞","cityid":"101281601","temp":"22","WD":"东风","WS":"1级","SD":"90%","WSE":"1","time":"08:20","isRadar":"0","Radar":""}}所以⾸先要将城市名转换为城市代码，最简单的办法是通过读取⼀个⽂本⽂件来获取：
格式如：
101010100=北京
101010200=海淀
101010300=朝阳
101010400=顺义
101010500=怀柔
101010600=通州
101010700=昌平
101010800=延庆
101010900=丰台
101011000=⽯景⼭
101011100=⼤兴
⽂本⽂件和PHP⽂件放在同⼀⽬录下；
于是PHP代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<script src="libs.baidu/jquery/1.9.0/jquery.js"></script>
<script src="libs.baidu/bootstrap/2.0.4/js/bootstrap.min.js"></script>
<link href="libs.baidu/bootstrap/2.0.4/css/bootstrap.min.css" rel="stylesheet"/>
<title>天⽓查询简单版</title>
</head>
<body>
<form class="form-horizontal" action="" method="post">
<legend>
Weather
</legend>
<div class="control-group">
<label class="control-label" for="idCity">城市：</label>
<div class="controls">
<input name="city" type="text" name="city" id="idCity" placeholder="请输⼊城市名字" maxlength="64">
</div>
</div>
<div class="control-group">
<div class="controls">
<button type="submit" class="btn btn-primary" >
确定
</button>
<button type="reset" class="btn btn-inverse" >
重置
</button>
</div>
</div>
</form>
<hr/>
<?php
header("Content-Type: text/html; charset=utf-8");
function getWeather($city) {
$wcity = file_get_contents("");
$pattern = '/([0-9]+)=' . $city . '/';
preg_match($pattern, $wcity, $matches, PREG_OFFSET_CAPTURE);
if ($matches == null) {
return null;
}
$cityID = $matches[1][0];
$data = file_get_contents('www.weather/data/sk/' . $cityID . '.html');
return json_decode($data, true);
}
if ($_POST != null && $_POST["city"] != null) {
$weather = getWeather($_POST["city"]);
if ($weather == null) {?>
<div class="alert alert-block" >
<button type="button" class="close" data-dismiss="alert">
×
</button>
<h4>警告!</h4>
发⽣错误了亲，您输⼊的城市好像没有到哦！
</div>
<?php return;
}
$info = $weather["weatherinfo"];
>
<table class="table table-striped table-bordered" >
<thead>
<th>实时天⽓信息</th>
</thead>
<tbody>
<?php
echo "<tr><td>城市：</td><td>".$info["city"]."</td></tr>";
echo "<tr><td>城市ID：</td><td>".$info["cityid"]."</td></tr>";
echo "<tr><td>⽓温：</td><td>".$info["temp"]."℃</td></tr>";
echo "<tr><td>风向：</td><td>".$info["WD"]."</td></tr>";
echo "<tr><td>风⼒：</td><td>".$info["WS"]."</td></tr>";
echo "<tr><td>湿度：</td><td>".$info["SD"]."</td></tr>";
echo "<tr><td>更新时间：</td><td>".$info["time"]."</td></tr>";
>
</tbody>
</table>
<?php
}
>
</body>
</html>
运⾏结果：
⽅法⼆：
1.可以不⽤⽂件，⽽是从天⽓⽹服务器动态获取城市名和ID：
html特效代码天气时钟当访问这个地址
服务器就会返还以下代码：
01|北京,02|上海,03|天津,04|重庆,05|⿊龙江,06|吉林,07|辽宁,08|内蒙古,09|河北,10|⼭西,11|陕西,12|⼭东,13|新疆,14|西藏,15|青海,16|⽢肃,17|宁夏,18|河南,19|江苏,20|湖北,21|浙江,22|安徽,23|福建,24|江西,25|湖南,26|贵州,27|四2. 这时，我们就知道了省份的代码；城市的代码是在省份的基础上扩展的，知道省份代码是第⼀步；同时我们也知道了省份名，这样，做下拉框让⽤户选地区也很简单：
知道了省份我们要看这个省有些什么市，就需要依据省份代码来获取不同的⽂件了，例如云南是05，我们要获取云南所有州市的信息就要访问：
返回⽂本：
2901|昆明,2902|⼤理,2903|红河,2904|曲靖,2905|保⼭,2906|⽂⼭,2907|⽟溪,2908|楚雄,2909|普洱,2910|昭通,2911|临沧,2912|怒江,2913|迪庆,2914|丽江,2915|德宏,2916|西双版纳
3.但是，这样还不够，我们还需要继续缩⼩范围，⽐如我们要知道⼤理州有哪些县级市和县，就需要继续访问：
果然，返回结果：
290201|⼤理,290202|云龙,290203|漾濞,290204|永平,290205|宾川,290206|弥渡,290207|祥云,290208|巍⼭,290209|剑川,290210|洱源,290211|鹤庆,290212|南涧
4.这时虽然可以到所有城市名，但这个代码还不是最终的城市代码，所以还要再来⼀次，不如说要宾川的代码：
290205|101290205
⾄此，读了四次，城市名和城市代码已获取到。
当然，解析数据也可以⽤Javascript来完成，但是由于Ajax不⽀持跨域名访问，所以将数据从中国天⽓⽹的服务器上获取到本地还需要⼀个简单服务器脚本来做代理，它的功能只是完成将请求的⽂件以字
符串返还Javascript来做动态数据显⽰，所以：
⾸先要写⼀个读取字符串的php
getstr.php
<?php
echo file_get_contents($_GET['url']);
>
⼀个使⽤Ajax的js⽂件：
ajax.js
function Ajax(recvType) {
var aj = new Object();
aj.targetUrl = '';
aj.sendString = '';
var request = false;
//window对象中有XMLHttpRequest存在就是⾮IE，包括（IE7，IE8）
if (window.XMLHttpRequest) {
request = new XMLHttpRequest();
if (request.overrideMimeType) {
request.overrideMimeType("text/xml");
}
/
/window对象中有ActiveXObject属性存在就是IE
} else if (window.ActiveXObject) {
var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
for (var i = 0; i < versions.length; i++) {
try {
request = new ActiveXObject(versions[i]);
if (request) {
return request;
}
} catch(e) {
request = false;
}
}
}
return request;
}
aj.XMLHttpRequest = aj.createXMLHttpRequest();
aj.processHandle = function() {
if (adyState == 4) {
if (aj.XMLHttpRequest.status == 200) {
if (aj.recvType == "HTML")
else if (aj.recvType == "XML")
}
}
}
< = function(targetUrl, resultHandle) {
aj.targetUrl = targetUrl;
if (resultHandle != null) {
adystatechange = aj.processHandle;
}
if (window.XMLHttpRequest) {
aj.XMLHttpRequest.open("get", aj.targetUrl);
aj.XMLHttpRequest.send(null);
} else {
aj.XMLHttpRequest.open("get", aj.targetUrl, true);
aj.XMLHttpRequest.send();
}
}
aj.post = function(targetUrl, sendString, resultHandle) {
aj.targetUrl = targetUrl;
if ( typeof (sendString) == "object") {
var str = "";
for (var pro in sendString) {
str += pro + "=" + sendString[pro] + "&";
}
aj.sendString = str.substr(0, str.length - 1);
} else {
aj.sendString = sendString;
}
if (resultHandle != null) {
adystatechange = aj.processHandle;
}
aj.XMLHttpRequest.open("post", targetUrl);
aj.XMLHttpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
aj.XMLHttpRequest.send(aj.sendString);
}
return aj;
}
⽹页部分代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<script src="libs.baidu/jquery/1.9.0/jquery.js"></script>
<script src="libs.baidu/bootstrap/2.0.4/js/bootstrap.min.js"></script>
<link href="libs.baidu/bootstrap/2.0.4/css/bootstrap.min.css" rel="stylesheet"/>
<title>实时⽓温信息</title>
<script type="text/javascript" src="./ajax.js"></script>
<script type="text/javascript">
function str2Array(data) {
data = place(/\|/g, "\":\"");
data = place(/,/g, "\",\"");
data = '({\"' + data + '\"})';
return eval(data);
}
function getProvince() {
var ajax = Ajax();
<("getstr.php?url=m.weather/l", function(data) {
var arr = str2Array(data);
var prov = ElementById("province");
for (var p in arr) {
prov.options.add(new Option(arr[p], p));
}
prov.options.selectedIndex = 0;
getCity(prov.value);
});
}
function getCity(provId) {
var ajax = Ajax();
<("getstr.php?url=m.weather/data5/city" + provId + ".xml", function(data) {
var arr = str2Array(data);
var city = ElementById("city");
for (var i = city.options.length; i >= 0; i--) {
}
for (var p in arr) {
city.options.add(new Option(arr[p], p));
}
getTown(city.value);
});
}
function getTown(provId) {
var ajax = Ajax();
<("getstr.php?url=m.weather/data5/city" + provId + ".xml", function(data) {
var arr = str2Array(data);
var town = ElementById("town");
for (var i = town.options.length; i >= 0; i--) {
}
for (var p in arr) {
town.options.add(new Option(arr[p], p));
}
getCityId();
});
}
function getCityId() {
var ajax = Ajax();
var index = ElementById("town").value;
<("getstr.php?url=m.weather/data5/city" + index + ".xml", function(data) {
var arr = str2Array(data);
cityId = arr[index];
showWeather(cityId);
});
}
function insertTab(tab, cel1, cel2) {
var newRow = tab.ws.length);
var cell = newRow.insertCell(0);
cell.innerHTML = cel1;
var cell = newRow.insertCell(1);
cell.innerHTML = cel2;
}
function showWeather(cityId) {
if (cityId == null) {
return;
}
var ajax = Ajax();
<("getstr.php?url=www.weather/data/sk/" + cityId + ".html", function(data) {
data = '(' + data + ')';
var info = eval(data)["weatherinfo"];
var tab = ElementById("weather");
var len = ws.length;
while(len-- > 0){
tab.deleteRow(len);
}
insertTab(tab, "城市：", info["city"]);
insertTab(tab, "城市ID：", info["cityid"]);
insertTab(tab, "⽓温：", info["temp"] + "℃");
insertTab(tab, "风向：", info["WD"]);
insertTab(tab, "风⼒：", info["WS"]);
insertTab(tab, "湿度：", info["SD"]);
insertTab(tab, "更新时间：", info["time"]);
});
}
getProvince();
</script>
<style type="text/css">
select {
width: 100px;
}
</style>
</head>
<body>
<div >
<legend>
Weather
</legend>
<br>
<select id="province" onchange="getCity(this.value)"></select>
<select id="city" onchange="getTown(this.value)"></select>
<select id="town" onchange="getCityId()"></select>
<br>
<table id="weather" class="table table-striped table-bordered" ></table>
</div>
</body>
</html>
运⾏结果：
这样做下拉框中的数据可以动态从天⽓⽹的服务器中读取过来再动态加载，因此也不⽤⾃⼰做转换了。

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