取得新浪天气预报网页的城市当日信息.
共有两个文件:
tianqi.html:利用下拉菜单跳转到网页获得天气预报信息,返回信息到浮动帧内;
<html>
<head></head>
<script>
<!--
function go(){
var url2='http://php.weather.sina.com.cn/search.php?city='
window.status='搜寻中...'; //隐藏状态栏信息
var a=document.form.city.selectedIndex;
var city1=document.form.city.options[a].value;
document.form.url.value=url2+city1;
//window.location=url+city1;
document.form.submit();
}
-->
</script>
<body>
<center>
<iframe width="300" height="70" name="frame" src="get_tianqi.php" frameborder="1"></iframe>
<form action="get_tianqi.php" method="post" name="form" target="frame">
<select name="city" onchange="go()">
<option value="">请选择一个城市</option>
<option value="广州">广州</option>
<option value="肇庆">肇庆</option>
<option value="湛江">湛江</option>
<option value="深圳">深圳</option>
<option value="东莞">东莞</option>
<input type="hidden" name="url" value="">
</select>
</form>
</center></body></html>
get_tianqi.php:取得天气预报信息
<?php
/* 此程序是从新浪网的天气网页http://php.weather.sina.com.cn/search.php?city=中取得某个城市的天气预报*/
ob_start(); //启动输出缓冲
function request_url(＄url,＄method='POST') {
＄url = parse_url(＄url); //解析url地址,取得host,path,port,query等
if (!＄url) return "couldn't parse url";
if (!isset(＄url['port'])) { ＄url['port'] = ""; }
if (!isset(＄url['query'])) { ＄url['query'] = ""; }
//连接服务器
＄fp = fsockopen(＄url['host'], ＄url['port'] ? ＄url['port'] : 80);
if (!＄fp) return "不能连接".＄url['host']."服务器";
//发送请求
fputs(＄fp, sprintf("＄method %s%s%s HTTP/1.0\n", ＄url['path'], ＄url['query'] ? "?" : "", ＄url['query']));
fputs(＄fp, "Host: ＄url[host]\n");
fputs(＄fp, "Content-type: application/x-www-form-urlencoded\n");
fputs(＄fp, "Connection: close\n\n");
//获得请求后返回的内容
＄line = fgets(＄fp,1024);
if (!eregi("^HTTP/1\.. 200", ＄line)) return;
＄results = "";
while(!feof(＄fp)) {
＄line = fgets(＄fp,1024);
＄results .= ＄line;
}
fclose(＄fp);
return ＄results;
}
//获得从其它网页传送过来的url(带查询字串)
if (!＄_REQUEST['url']) {
echo "请添加一个url";
exit;
}else{
＄url=＄_REQUEST['url'];
}
＄content=request_url(＄url); //取得请求后的网页内容
＄start=strpos(＄content,"<!-- 天气状况 begin -->");//取得天气预报的截取段
＄end=strpos(＄content,"<!-- 天气状况 end -->");
＄len=＄end-＄start;
＄b=substr(＄content,＄start,＄len); //截取得指定内容
//从上面的截取段中取得城市今日天气预报的截取段
＄sub_start=strpos(＄b,"<div class=\"City_Data\">");
＄sub_end=strpos(＄b,"<div class=\"Weather_SM\">");
＄len2=＄sub_end-＄sub_start;
＄c=substr(＄b,＄sub_start,＄len2);
＄d=split("\n",＄c); //去掉换行符
//print_r(＄d);
＄e="";
foreach (＄d as ＄key=>＄value){
＄value=strip_tags(＄value); //去掉html标记
＄e.=＄value;
if (＄key==2) {
＄e.="<br>";
}
}
echo ＄e;
ob_end_flush();
?>
