雅虎天气API地址： http://weather.yahooapis.com/forecastrss     有两个可选参数w和u，其中w参数是基于WOEID的城市代码，可以在网上根据城市英文名查到，u参数是设置返回数据中的摄氏和华氏（c为摄氏，f为华氏）。     实际请求地址如：http://weather.yahooapis.com/forecastrss?w=15015432&u=c      返回数据为xml格式，含有命名空间，无法使用simpleXML处理，这次分享的代码就是使用XMLReader和DOMDocument来处理该数据（获取返回数据中的天气状况代码、温度及湿度值）。     首先是使用XMLReader时的代码： [php]$url = ‘http://weather.yahooapis.com/forecastrss?w=15015432&u=c'; $reader = new XMLReader(); $reader->open($url,‘utf-8’); while($reader->read()){ if($reader->name == ‘yweather:condition’){ $code = $reader->getAttribute(‘code’); //获取天气代码 $temp = $reader->getAttribute(’temp’); //获取温度 } if($reader->name == ‘yweather:atmosphere’){ $humi = $reader->getAttribute(‘humidity’); //获取湿度 } }[/php]

 然后是使用DOMDocument处理的代码： [php]$url = ‘http://weather.yahooapis.com/forecastrss?w=15015432&u=c'; $yweather = “http://xml.weather.yahoo.com/ns/rss/1.0"; //命名空间 $res = new DOMDocument(); $res->load($url);

$node = $res->getElementsByTagNameNS($yweather, ‘atmosphere’); $humi = $node->item(0)->attributes->item(0)->nodeValue; //获取湿度 $node = $res->getElementsByTagNameNS($yweather, ‘condition’); $code = $node->item(0)->attributes->item(1)->nodeValue; //获取天气代码 $temp = $node->item(0)->attributes->item(2)->nodeValue; //获取温度[/php]  最后我们要将数字格式的天气代码转换成相应的中文： [php]function code2char($code){ switch($code){ case 0: return ‘龙卷风’; case 1: return ‘热带风暴’; case 2: return ‘暴风’; case 3: return ‘大雷雨’; case 4: return ‘雷阵雨’; case 5: return ‘雨夹雪’; case 6: return ‘雨夹雹’; case 7: return ‘雪夹雹’; case 8: return ‘冻雾雨’; case 9: return ‘细雨’; case 10: return ‘冻雨’; case 11: return ‘阵雨’; case 12: return ‘阵雨’; case 13: return ‘阵雪’; case 14: return ‘小阵雪’; case 15: return ‘高吹雪’; case 16: return ‘雪’; case 17: return ‘冰雹’; case 18: return ‘雨淞’; case 19: return ‘粉尘’; case 20: return ‘雾’; case 21: return ‘薄雾’; case 22: return ‘烟雾’; case 23: return ‘大风’; case 24: return ‘风’; case 25: return ‘冷’; case 26: return ‘阴’; case 27: return ‘多云’; case 28: return ‘多云’; case 29: return ‘局部多云’; case 30: return ‘局部多云’; case 31: return ‘晴’; case 32: return ‘晴’; case 33: return ‘转晴’; case 34: return ‘转晴’; case 35: return ‘雨夹冰雹’; case 36: return ‘热’; case 37: return ‘局部雷雨’; case 38: return ‘偶有雷雨’; case 39: return ‘偶有雷雨’; case 40: return ‘偶有阵雨’; case 41: return ‘大雪’; case 42: return ‘零星阵雪’; case 43: return ‘大雪’; case 44: return ‘局部多云’; case 45: return ‘雷阵雨’; case 46: return ‘阵雪’; case 47: return ‘局部雷阵雨’; default: return ‘水深火热’; }[/php]