借用Google API 写一个查看天气预报的类

php代码

<?
//- Describe: 
//- Author: liuguichun
//- Link: 
//- CreateTime: 2010-6-21
//- UpdateTime: 
//- Package: 
class weather {
 static $url = &#39;http://www.google.com/ig/api?hl=zh-cn&weather=&#39;;
 static $city = &#39;Beijing&#39;; //默认城市北京
 static $weatherXML = &#39;&#39;;
 /**
  * 获得远程xml并缓存到本地
  */
 static public function getXML() {
  header ( &#39;Content-Type: text/html; charset = utf-8&#39; );
  if (isset ( $_GET [&#39;city&#39;] )) {
   self::$city = empty ( $_GET [&#39;city&#39;] ) ? &#39;Beijing&#39; : $_GET [&#39;city&#39;];
  }
  $contents = file_get_contents ( self::$url . self::$city ) or die ( &#39;查询出错&#39; );
  self::$weatherXML = date ( "Ymd" ) . &#39;-&#39; . self::$city . &#39;-weather.xml&#39;;
  if (is_file ( self::$weatherXML )) {
   $fileTime = filemtime ( self::$weatherXML );
   $stater = time () - $fileTime - 60 * 60 * 2;
   if ($stater < 0) {
    self::cacheXML ( $contents );
   }
   return true;
  }
  self::cacheXML ( $contents );
 }
 /**
  * 解析xml
  */
 static public function analysisXML() {
  if (is_file ( self::$weatherXML )) {
   $xml = simplexml_load_file ( self::$weatherXML );
  } else {
   $xml = simplexml_load_file ( self::$url . self::$city );
  }
  $xml = ( array ) $xml;
  $city = ( array ) $xml [&#39;weather&#39;]->forecast_information->city;
  if (isset ( $xml [&#39;weather&#39;]->problem_cause )) {
   $problem = ( array ) $xml [&#39;weather&#39;]->problem_cause;
   echo $problem [&#39;@attributes&#39;] [&#39;data&#39;];
   return;
  }
  
  $conditions = ( array ) $xml [&#39;weather&#39;]->current_conditions->condition;
  $humidity = ( array ) $xml [&#39;weather&#39;]->current_conditions->humidity;
  $temp_c = ( array ) $xml [&#39;weather&#39;]->current_conditions->temp_c;
  $conditions_icon = ( array ) $xml [&#39;weather&#39;]->current_conditions->icon;
  $wind_condition = ( array ) $xml [&#39;weather&#39;]->current_conditions->wind_condition;
  $forecast = ( array ) $xml [&#39;weather&#39;];
  $forecast = ( array ) $forecast [&#39;forecast_conditions&#39;];
  $html = &#39;&#39;;
  foreach ( $forecast as $key => $val ) {
   
   ${&#39;day_of_week_&#39; . $key} = ( array ) $val->day_of_week;
   ${&#39;low_&#39; . $key} = ( array ) $val->low;
   ${&#39;high_&#39; . $key} = ( array ) $val->high;
   ${&#39;icon_&#39; . $key} = ( array ) $val->icon;
   ${&#39;condition_&#39; . $key} = ( array ) $val->condition;
   $html .= "

{${&#39;day_of_week_&#39;.$key}[&#39;@attributes&#39;][&#39;data&#39;]}        http://www.google.com{${&#39;icon_&#39;.$key}[&#39;@attributes&#39;][&#39;data&#39;]}\ " width=40 height=40>

        {${&#39;low_&#39;.$key}[&#39;@attributes&#39;][&#39;data&#39;]}°C | {${&#39;high_&#39;.$key}[&#39;@attributes&#39;][&#39;data&#39;]}°C
";
  
  }
  self::printCss ();
  echo <<   

  
{$city[&#39;@attributes&#39;][&#39;data&#39;]}  

    

      
http://www.google.com{$conditions_icon[&#39;@attributes&#39;][&#39;data&#39; ]}" width=40 height=40>

      

      
{$temp_c[&#39;@attributes&#39;][&#39;data&#39;]}°C

      
当前： {$conditions[&#39;@attributes&#39;][&#39;data&#39;]}

        {$wind_condition[&#39;@attributes&#39;][&#39;data&#39;]}

        {$humidity[&#39;@attributes&#39;][&#39;data&#39;]}

    

    

 $html
    

  



weather;
 
 }
 /**
  * 打印样式
  */
 static public function printCss() {
  echo << 

css;
 }
 /**
  * 创建xml缓存
  * @param $contents 要缓存的内容
  */
 static private function cacheXML($contents) {
  $contents = str_ireplace ( &#39;&#39;, " \n", $contents );
  $contents = mb_convert_encoding ( $contents, &#39;utf-8&#39;, &#39;gbk&#39; );
  file_put_contents ( self::$weatherXML, $contents ) or die ( &#39;没有写权限&#39; );
 }
}
weather::getXML ();
weather::analysisXML ();
?>