php获取天气预报的代码

<?php    

$URLStyle = "http://flash.weather.com.cn/wmaps/xml/%s.xml"    

$chinaURL = sprintf($URLStyle, "china")    

$chinaStr = file_get_contents($chinaURL)    

$chinaObj = simplexml_load_string($chinaStr)    

$chinaObjLen = count($chinaObj->city)    

echo "chinaObjLen = ".$chinaObjLen."\n"    

for ($i=0$i<$chinaObjLen$i++){    

//遍历省一级节点，共37个    

        $level1 = $chinaObj->city[$i]["pyName"]    

        $shengjiURL = sprintf($URLStyle, $level1)    

        $shengjiStr = file_get_contents($shengjiURL)    

        //echo $shengjiStr    

        $shengjiObj = simplexml_load_string($shengjiStr)     

        $shengjiObjLen = count($shengjiObj->city)    

//      echo $chinaObj->city[$i]["quName"]    

//      echo " ".$shengjiObjLen."\n"    

        for ($j=0$j<雀仿肆$shengjiObjLen$j++){    

        //遍历市一级节点    

                $level2 = $shengjiObj->city[$j]["pyName"]    

                $shijiURL = sprintf($URLStyle, $level2)    

                $shijiStr = file_get_contents($shijiURL)    

                //echo $shijiStr    

                $shijiObj = simplexml_load_string($shijiStr)     

             //直辖市和海南、台湾、钓鱼岛等没有县级节点    

                if(!$shijiObj){    

                        echo "WARNNING: not exsit next level node. - ".$level1."-".$shijiURL."\n"    

                        echo '  "'.$shengjiObj->city[$j]["cityname"].'" => '    

                        echo $shengjiObj->city[$j]["url"].",\n"    

                        continue    

                }    

                $shijiObjLen = count($shijiObj->city)    

                //echo $shengjiObj->city[$j]["cityname"]."  "    

                //echo $shijiObjLen."\n"    

                for ($k=0$k<$shijiObjLen$k++){    

                //遍历县一级节点    

                   顷轿     $xianji_code = $shijiObj->city[$k]["url"]    

                        echo '  "'.$shijiObj->city[$k]["cityname"].'" => '    

          大虚              echo $shijiObj->city[$k]["url"].",\n"    

                        //echo $xianji_code."\n"     

                }    

        }    

}           

//print_r($chinaObj)    

?>

通过XML接口根节点递归获得全国几千个县以上城市cide code的代码

$meta = file_get_contents('http://www.weather.com.cn/weather/101010100.shtml'桐运)

//print_r($meta)

preg_match('/<title>(.+?)<闹手\/title>/',$meta,$arr)

print_r($arr)

echo $arr[1]就是液轮嫌你要的

给你简单说下原理，小偷程度野伍原粗仿理：就是比如你要获取中华新闻网站首页的新闻列表，首先你就要分析下该首页的HTML组成格式，知道组成格式后，再写正则表达式，来获取列表和链接地址，这样你就可以获取到想要的内容，把获取到的内容记录到你服务器文本文件，做为数据库使用，岩脊纤然后再用显示程序显示你获取过来的内容。思路就是这样简单，呵呵 ~~

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