Programming Challenge 2

In Challenge 1, i successfully simulated a post request in native environment.

In challenge 2, i have to add a get request to fetch the question page, then use Regular Expression to get the random data.

After a hours coding, i can't wait to enjoy my work and got the mark. However, my script was too slow to post the result in 1 second.

Googled for a while with the keywords "php fsockopen slow", comed across this post:

[1]http://yubosun.akcms.com/tech/php-fsockopen-slow.htm PHP的fsockopen方式访问接口慢的原因与优化方案

It seems like the problem of connection paraments in the request header which wait for the response of remote server. When the server set a keep-connection section to 5-15s, my script will keep waiting until the remote server close the connection.
Then, i checked the fsockopen function in the PHP manual, found this:

"

EDITORS NOTE: HTTP/1.1 uses persistent connection causing this delay. Use "Connection: close" header to disable it.

"

So, i modified the header fileds, then, everything worked fine.

This is my code snippets:

<?php
/*
发送数据,封装
*/

function get_request($url,$referer='',$cookie='')
{
	$url = parse_url($url);

	if($url['scheme'] != 'http')
		die('Error: only HTTP request are supported');
	
	$host = $url['host'];
	$path = $url['path'];

	$fp = fsockopen($host,80,$errno,$errstr,30);
	if($fp){
		fputs($fp,"GET $path HTTP/1.1\r\n");
		fputs($fp,"Host: $host\r\n");
		if($referer != ''){
			fputs($fp,"Referer:$referer\r\n");
		}
		fputs($fp,"Connection: close\r\n");
		fputs($fp,"Cookie: $cookie\r\n\r\n");
		
		$result = '';
		while(!feof($fp)){
			$result .= fgets($fp,1024);	
		}
	}
	fclose($fp);
	// split the result header from the content
    $result = explode("\r\n\r\n", $result, 2);
 
    $header = isset($result[0]) ? $result[0] : '';
    $content = isset($result[1]) ? $result[1] : '';
 
    // return as structured array:
    return array(
        'status' => 'ok',
        'header' => $header,
        'content' => $content
    );	
}
/*
 * post带有cookie的数据包
 * string $url:the url you will visit e.g: http://www.enigmagroup.org/missions/programming/2/
 * array  $data: post或者get的数据
 * string $referer: refer section, defalut for ''
 * string $cookie: your can get it from fiddle2
 */
function post_request($url,$data,$referer='',$cookie='')
{
	$data = http_build_query($data);
	$url = parse_url($url);

	if($url['scheme'] != 'http')
		die('Error: only HTTP request are supported');

	$host = $url['host'];
	$path = $url['path'];

	$fp = fsockopen($host,80,$errno,$errstr,30);

	if($fp){
		fputs($fp,"POST $path HTTP/1.1\r\n");
		fputs($fp,"Host: $host\r\n");
		if($referer != ''){
			fputs($fp,"Referer:$referer\r\n");
		}

		fputs($fp,"Content-Type: application/x-www-form-urlencoded\r\n");
		fputs($fp,"Content-length: ". strlen($data) ."\r\n");
		fputs($fp,"Connection: close\r\n");
		fputs($fp,"Cache-Control: max-age=0\r\n");
		fputs($fp,"Cookie: $cookie\r\n\r\n");

		fputs($fp,$data);

		$result = '';
		while(!feof($fp)){
			$result .= fgets($fp,128);	
		}
	}else{
		return array(
			'status' => 'err',
			'error'  => "$errstr($errno)"
		);
	}
	fclose($fp);

	// split the result header from the content
    $result = explode("\r\n\r\n", $result, 2);
 
    $header = isset($result[0]) ? $result[0] : '';
    $content = isset($result[1]) ? $result[1] : '';
 
    // return as structured array:
    return array(
        'status' => 'ok',
        'header' => $header,
        'content' => $content
    );	
}

$cookie = 'according-to-your-profile';
$gurl = 'http://www.enigmagroup.org/missions/programming/2/';

$ret = get_request($gurl,'',$cookie);
echo "get data============\r\n{$ret['content']}\r\n";
$data = array();
echo "match process\n\n";
if(preg_match("/<form[^>]*?>(.*?)<\/form>/is",$ret['content'],$match_fulltext)){
	echo "match_fulltext=>\n$match_fulltext[0]";
	if(preg_match_all("/<input\s.*?>/is",$match_fulltext[0],$match))
	{
		print_r($match);
		foreach($match[0] as $line){
			echo $line;
			preg_match("/<input\s.*name=\"(?P<name>.*)\"\svalue=\"((?P<value>.*))\"/",$line,$rst);
			$data[$rst['name']] = $rst['value'];
		}
		$data['answer'] = $data['E[number]'] * 4;
		//$data['E[time]'] = time();
		print_r($data);
	}
}
echo "match over\n\n";
$purl = 'http://www.enigmagroup.org/missions/programming/2/index.php';
$ret = post_request($purl,$data,'',$cookie);
echo "post response============\r\n";
print_r($ret);
?>