Stange string in http response when using php - php

Question

My php code have been working fine. And suddenly i got very strange string in response data.
Every response data is like below.where is "87,0" and"3e,0" come from? How can i get rid of them?(They appears before and after every response data.)
HTTP/1.1 200 OK
Date: Fri, 14 Nov 2014 01:57:40 GMT
Server: Apache
X-Powered-By: PHP/5.4.34
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html
87
a:1:{i:0;s:116:"http://www.nytimes.com/2014/09/15/sports/basketball/united-states-wins-fiba-world-cup-title-in-a-rout-of-serbia.html";}
0
HTTP/1.1 200 OK
Date: Fri, 14 Nov 2014 01:57:40 GMT
Server: Apache
X-Powered-By: PHP/5.4.34
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html
3e
a:1:{i:0;s:44:"http://www.bbc.com/news/in-pictures-29204063";}
0
foreach($template_arr as $tkey => $template)
{
$keyword = self::getKeyword($template, $typename);
$keyword = urlencode($typename);//encode because it is going to be send through url
$urlPre = self::getURLPre('news');
$urlrule = self::getURLRule($template); //actually it is used in both siteSearch and urlrule,but urlrule seems unnecessary
$s = stream_socket_client("$sochost:$socportno", $errno, $errstr, $soctimeout, STREAM_CLIENT_ASYNC_CONNECT | STREAM_CLIENT_CONNECT);
if ($s)
{
$sockets[$template] = $s;
$out = "GET /DataAC/Search/Search_Bridge_G.php?keyword=$keyword&resultSize=$resultSize&urlPre=$urlPre&urlrule=$urlrule&template=$template";
$out.= " HTTP/1.1\r\n";
$out.= "Connection: Close\r\n";
$out.= "Host:$sochost\r\n\r\n";
fwrite($s, $out);
}
else
{
echo "$errstr ($errno) ,open sock on search keyword # $keyword on template # $tempalte erro when open search bridge.<br/>\n";
}
}
while (count($sockets))
{
$read = $sockets;
$w = null;
$e = null;
stream_select($read, $w, $e, $soctimeout);
if (count($read))
{
/* stream_select generally shuffles $read, so we need to
compute from which socket(s) we're reading. */
foreach($read as $r)
{
$template = array_search($r, $sockets);
$data = fread($r, $convenient_read_block);
// A socket is readable either because it has
// data to read, OR because it's at EOF.
if (strlen($data) == 0)
{
//echo "Template " . $template . " closes at " . date('h:i:s') . "</br>";
$responseData = $result[$template];
echo "!!!!!!!!!!!!!!!$responseData!!!!!!!!!!!!!!!";
$responseArray=unserialize(substr($responseData,strpos($responseData,"\r\n\r\n")+4)); //get serialize array from respose data and unserialize it ,"+4" means we don't need \r\n\r\n
//var_dump($responseArray);
$urlarr = $responseArray;
// assemble result array start
if (!empty($urlarr))
{
$template_url_arr[$template] = $urlarr[0];
$timenow = date('Y-m-d H:i:s', time());
echo "</br>######### Machine search : keyword:#" . $typename . " target url:" . $urlarr[0] . " timestamp: $timenow" . "#########</br>";
}
else
{
echo "</br> ######### Template url arr empty when query keyword #" . $keyword . " under template #" . $template . " #########</br>";
}
// assemble result array end
fclose($r);
unset($sockets[$template]);
}
else
{
if(!isset($result[$template]))//init the array element or there will be a warning
$result[$template]= "";
$result[$template].= $data;
}
}
}
else
{
/* A time-out means that *all* streams have failed
to receive a response. */
echo "Time-out!\n";
break;
}
}
script:Search_Bridge_G.php
require_once '../../global.php';
//require_once('UTIL/MyFileUtil.php');
//require_once('UTIL/MyDocUtil.php');
require_once 'DataAC/Search/GetGSearchLink.php';
error_reporting(E_ALL);
$keyword=$_GET['keyword'];
$keyword=preg_replace('/\s+/', '%20', trim($keyword)); //replace ' ' with %20
$resultSize=$_GET['resultSize'];
$urlPre=$_GET['urlPre'];
$urlrule=$_GET['urlrule'];
$template=$_GET['template'];
$ant = new \DataGenerator\GetLinkG\GetGSearchLink($keyword,$resultSize, $urlPre,$urlrule);
$urlarr = $ant->getFilteredURL($template);
/*
echo "</br>key:".$keyword."</br>";
echo "</br>rsize:".$resultSize."</br>";
echo "</br>urlpre:".$urlPre."</br>";
echo "</br>urlrule:".$urlrule."</br>";
echo "</br>templa:".$template."</br>";
*/
//var_dump($urlarr);
echo serialize($urlarr);

Answer 1

When an HTTP server cannot determine the Content-Length: in advance, for instance when the output is produced by a dynamic script as opposed to a static file, it will send the output in chunks (as indicated by the Transfer-Encoding: chunked header). Each chunk is prefixed by length expressed in hexadecimal digits. Those are the "strange strings" that you see. The exact details can be found in:
RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing