PHP function fsockopen gets Sina weather forecast

Get the city's current day information from the Sina weather forecast webpage.
There are two files in total:
tianqi.html: Use the drop-down menu to jump to the webpage to get the weather forecast information, and return the information to the floating frame;

< ;center>

Please select one City
Guangzhou
Zhaoqing

Shenzhen
Dongguan

get_tianqi.php: Get weather forecast information
/* This program is to obtain the weather forecast of a certain city from Sina’s weather page http://php.weather.sina.com.cn/search.php?city=*/
ob_start() ; //Start output buffering
function request_url(＄url,＄method='POST') {
＄url = parse_url(＄url); //Parse the url address and obtain host, path, port, query, etc.
if (! ＄url) return "couldn't parse url";
if (!isset(＄url['port'])) { ＄url['port'] = ""; }
if (!isset(＄url[' query'])) { ＄url['query'] = ""; }
//Connect to the server
＄fp = fsockopen(＄url['host'], ＄url['port'] ? ＄url['port '] : 80);
if (!＄fp) return "Cannot connect".＄url['host']."Server";
//Send request
fputs(＄fp, sprintf("＄method %s% s%s HTTP/1.0n", $url['path'], $url['query'] ? "?" : "", $url['query']));
fputs($fp, "Host : ＄url[host]n");
fputs(＄fp, "Content-type: application/x-www-form-urlencodedn");
fputs(＄fp, "Connection: closenn");
//Get Content returned after request
＄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;
}
//Get from other web pages The sent url (with query string)
if (!＄_REQUEST['url']) {
echo "Please add a url";
exit;
}else{
＄url=＄_REQUEST['url'] ;
}

＄content=request_url(＄url); //Get the requested web page content

＄start=strpos(＄content,"");// Get the intercepted section of the weather forecast
＄end=strpos(＄content,"");
＄len=＄end-＄start;
＄b=substr(＄content, ＄start,＄len); //Get the specified content
//Get the interception segment of today’s weather forecast for the city from the above interception segment
＄sub_start=strpos(＄b,"