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类的代码：
1 <?php
2/**
3 * 抓取腾讯天气，存储成XML
4 * @author PeterPan
5 * @final 2007-08-27
6 */
7class Weather{
8 /**成员变量*/
9 var $m_city_list = array();
10 var $m_data = array();
11 var $m_url_tpl = "http://weather.news.qq.com/inc/07_ss{city_code}.htm";
12 var $m_url = "";
13 var $m_city_code = "125";
14 /**
15 * 构造函数
16 */
17 function __construct($city_code=""){
18 if ($city_code){
19 $this->m_city_code = $m_city_code;
20 }
21 }
22 function __destruct(){
23 unset($this->m_data);
24 unset($this->m_url_tpl);
25 unset($this->m_url);
26 unset($this->m_city_code);
27 }
28 /**
29 * 根据$url提供的地址，读取数据
30 *
31 * @param unknown_type $url
32 */
33 function getUrlContent($url){
34 //先尝试用file_get_contents获取
35 if ( $data=file_get_contents($url) ){
36 return $data;
37 }
38 else {
39 $url_a = parse_url($url);
40 if ( $url_a['scheme']!="http"&&$url_a['scheme']!="https" ){
41 return "";
42 }
43 if ( empty($url_a['port']) ){
44 $url_a['port'] = 80;
45 }
46 //开始连接
47 $data = "";
48 if ( $fp=fsockopen($url_a['host'],$url_a['port'],$errno,$errstr,30) ){
49 $request = "GET ".$url_a['path']." HTTP/1.1\r\n";
50 $request .= "Host: ".$url_a['host']."\r\nConnection: Close\r\n\r\n";
51 fwrite($fp,$request);
52 $line = "";
53 while ( $line=fread($fp,2048) ){
54 $data .= $line;
55 }
56 fclose($fp);
57 }
58 $pos = strpos($data,'<html>');
59 $data = substr($data,$pos);
60 echo $data;
61 return $data;
62 }
63 }
64 /**
65 * 获取某个城市的天气情况，需要打开allow_url_open
66 *
67 * @param string $city_code 城市代码，默认为$m_city_code指定的城市
68 * @param int $reget 是否重新获取，默认为0
69 * @return array
70 */
71 function getWeather($city_code="",$reget=0){
72 if ($city_code){
73 $this->m_city_code = $city_code;
74 }
75 if ( $reget&&key_exists($this->m_city_code,$this->m_data) ){
76 return $this->m_data[$this->m_city_code];
77 }
78 $this->m_url = str_replace("{city_code}",$this->m_city_code,$this->m_url_tpl);
79 if ( $content = $this->getUrlContent($this->m_url) ){
80 $content = iconv('gb2312','UTF-8',$content);
81 $weather = array();
82 //读取城市信息
83 $pattern = '/<td width="151" height="82" class="wht1 lk37">(\S+)<\/td>/ims';
84 preg_match_all($pattern,$content,$matches);
85 $weather['city'] = trim($matches[1][0]);
86 //读取天气情况
87 $pattern = '/<td height="77" class="wht2 lk37">.<div class="txbd">(\S+)<\/div>([^<]+)<\/td>/ims';
88 preg_match_all($pattern,$content,$matches);
89 $weather['desc'] = trim($matches[1][0]);
90 $weather['temperature'] = trim($matches[2][0]);
91 //获取天气详细
92 $pattern = '/<td class="whp3 lk37">(.+)<\/td>/ims';
93 preg_match_all($pattern,$content,$matches);
94 $weather['detail'] = trim($matches[1][0]);
95 $weather['detail'] = preg_replace('/([\r\n])[\s]+/','',$weather['detail']);
96 $this->m_data[$this->m_city_code] = $weather;
97 unset($weather);
98 return $this->m_data[$this->m_city_code];
99 }
100 else {
101 return array();
102 }
103 }
104 /**
105 * 获取页面中的所有地区
106 *
107 * @return array
108 */
109 function getAllCity(){
110 $url = "http://weather.news.qq.com/inc/07_ss125.htm";
111 if ( $content = $this->getUrlContent($url) ){
112 $content = iconv('gb2312','UTF-8',$content);
113 $city_list = array();
114 //获取城市列表
115 $pattern = '/<option (selected="selected" )?value="(\S+)">(\S+)<\/option>/ims';
116 preg_match_all($pattern,$content,$matches);
117 $c = count($matches[2]);
118 for ($i=0;$i<$c;$i++){
119 $city_list[$matches[2][$i]] = trim($matches[3][$i]);
120 }
121 $this->m_city_list = $city_list;
122 return $this->m_city_list;
123 }
124 else {
125 return array();
126 }
127 }
128 /**
129 * 获得所有城市的天气情况
130 *
131 * @return array
132 */
133 function getAllCityWeather(){
134 if ( empty($this->m_city_list) ){
135 $this->m_city_list = $this->getAllCity();
136 }
137 foreach ($this->m_city_list as $key=>$value){
138 $this->getWeather($key);
139 }
140 return $this->m_data;
141 }
142 /**
143 * 将天气信息存储到XML文件中
144 *
145 * @param string $xml_path 文件路径
146 */
147 function saveXML($xml_path=""){
148 $xml = '<?xml version="1.0" encoding="UTF-8"?>
149 <root>
150 ';
151 foreach ($this->m_data as $key=>$value){
152 $xml .= '
153 <city code="'.$key.'" name="'.$value['city'].'">
154 <desc><![CDATA['.$value['desc'].']]></desc>
155 <temperature><![CDATA['.$value['temperature'].']]></temperature>
156 <detail><![CDATA['.$value['detail'].']]></detail>
157 </city>';
158 }
159 $xml .= '</root>';
160 if ( $xml_path ){
161 //打开并写入数据
162 if ( $fp=fopen($xml_path,"w") ){
163 fwrite($fp,$xml);
164 }
165 fclose($fp);
166 }
167 return $xml;
168 }
169 /**
170 * 从XML中读取数据
171 *
172 * @param unknown_type $xml_path
173 */
174 function loadDataFromXML($xml_path){
175 $this->m_city_list = array();
176 $this->m_data = array();
177 if ( $data=file_get_contents($xml_path) ){
178 $xml = new SimpleXMLElement($data);
179 foreach ($xml->city as $city){
180 $weather = array('city'=>'','desc'=>'','temperature'=>'','detail'=>'');
181 $code = (string)$city['code'];
182 $name = (string)$city['name'];
183 $this->m_city_list[$code] = $name;
184 $weather['city'] = $name;
185 $weather['desc'] = (string)$city->desc;
186 $weather['temperature'] = (string)$city->temperature;
187 $weather['detail'] = (string)$city->detail;
188 $this->m_data[$code] = $weather;
189 }
190 }
191 //var_dump($this->m_city_list);
192 var_dump($this->m_data);
193 }
194}
195?>
测试程序：
1<?php
2header("Content-Type: text/html; charset=UTF-8"); //设置页面编码
3$weather_obj = new Weather();
4//获取可用的城市
5$city_list = $weather_obj->getAllCity();
6var_dump($city_list);
7echo "<br><br>";
8//获取北京的天气情况，北京的代号是125
9$result = $weather_obj->getWeather("125");
10var_dump($result);
11echo "<br><br>";
12//获取所有地区的天气
13$result = $weather_obj->getAllCityWeather();
14var_dump($result);
15echo "<br><br>";
16//保存数据到文件
17$xml = $weather_obj->saveXML("a.xml");
18//从文件加载数据
19$weather_obj->loadDataFromXML("a.xml");
20var_dump($weather_obj->getAllCityWeather());
21?>
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