php采集自中央气象台范围覆盖全国的天气预报代码实例

$p = $_get['q']; 
$k = 0; 
$encoding = mb_detect_encoding($p); 
if($encoding != "utf-8"){ 
        $p = mb_convert_encoding($p,"utf-8","gbk"); 
} 
$p_arr = array( 
       "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" => "四川", 
      "28" => "广东", 
      "29" => "云南", 
      "30" => "广西", 
      "31" => "海南", 
      "32" => "香港", 
      "33" => "澳门", 
      "34" => "台湾"
); 

function find(&$item,$key,$data){ 
        global $k; 
        if(preg_match("/$item/u",$data)){ 
           $k = $key; 
        } 
} 

function get_data_arr($key){ 
        if(!file_exists("./data/city{$key}.xml")){ 
            $c =file_get_contents( "http://m.weather.com.cn/data5/city{$key}.xml" ); 
            file_put_contents("./data/city{$key}.xml",$c); 
        } 
        else{ 
            $c = file_get_contents("./data/city{$key}.xml"); 
        } 
       $arr = explode(",",$c); 
       foreach($arr as $v){ 
           $data = explode("|",$v); 
           $ret[$data[0]] = $data[1]; 
       }
       return $ret; 
} 

array_walk($p_arr,'find',$p); 
array_walk(get_data_arr($k),'find',$p); 
array_walk(get_data_arr($k),'find',$p); 
$ccode = get_data_arr($k); 
echo file_get_contents("http://m.weather.com.cn/data/{$ccode[$k]}.html");