PHP imitates user login and reads DZ forum code verification program-3_PHP tutorial

error_reporting(0);
session_start();
header("Content-Type:text/html;charset=utf-8");
require("config.php");
$_SESSION["cookie_jar1"]=tempnam("temp","C2");
$url=DZ."ajax.php?inajax=1&action=checkseccode&seccodeverify=".$_GET["code"];
$ch=curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_COOKIEFILE,$_SESSION["cookie_jar"]);
curl_setopt($ch,CURLOPT_COOKIEJAR,$_SESSION["cookie_jar1"]);
$html=curl_exec($ch);
preg_match("/(?<=encoding=").*?(?=")/",$html,$charset);
if($charset[0]!=="utf-8")
{
 $html=iconv($charset[0],"utf-8",$html);
}
curl_close($ch);
preg_match("/(?<=CDATA[).*?(?=])/",$html,$outs);
echo $outs[0];
?>