php函数fsockopen获取新浪天气预报

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; 
 

 
<script> <br><!-- <br/>function go(){ <br/>var url2=&#39;http://php.weather.sina.com.cn/search.php?city=&#39; <br/>window.status=&#39;搜寻中...&#39;; //隐藏状态栏信息 <br/>var a=document.form.city.selectedIndex; <br/>var city1=document.form.city.options[a].value; <br/>document.form.url.value=url2+city1; <br/>//window.location=url+city1; <br/>document.form.submit(); <br/>} <br/>--> <br></script> 
 
 
 

 
 
请选择一个城市 
广州 
肇庆 
湛江 
深圳 
东莞 
 
 

 
 

get_tianqi.php:取得天气预报信息 
/* 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,"");//取得天气预报的截取段 
＄end=strpos(＄content,""); 
＄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,"