PHP imitates user login and reads DZ forum code verification program_PHP tutorial

error_reporting(0);
session_start();
require("config.php");
if(!is_dir("temp"))
{
 mkdir("temp",0777);
}
$c=tempnam("temp","c");
$url=DZ."logging.php?action=login";
 $ch=curl_init();
 curl_setopt($ch,CURLOPT_URL,$url);
 curl_setopt($ch,CURLOPT_USERAGENT,$_SERVER["HTTP_USER_AGENT"]);
 curl_setopt($ch,CURLOPT_COOKIEJAR,$c);
 curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
 $html=curl_exec($ch);
 preg_match("/(?<=charset=).*?(?=")/",$html,$charset);
 if($charset[0]!=="utf-8")
 {
  $html=iconv($charset[0],"utf-8",$html);
 }
 curl_close($ch);
 preg_match("/(?<=formhash" value=").*?(?=")/",$html,$outs);
 $_SESSION["hash"]=$outs[0];
 

$c1=tempnam("temp","c1");
$re_url=DZ."ajax.php?action=updateseccode&secchecktype=&inajax=1&ajaxtarget=seccodeverify_menu";
$ch=curl_init();
curl_setopt($ch,CURLOPT_URL,$re_url);
curl_setopt($ch,CURLOPT_USERAGENT,$_SERVER["HTTP_USER_AGENT"]);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_COOKIEFILE,$c);
curl_setopt($ch,CURLOPT_COOKIEJAR,$c1);
$html=curl_exec($ch);
curl_close($ch);
preg_match("/(?<=src=").*?(?=")/",$html,$outs);

$_SESSION["cookie_jar"]=tempnam("temp","C1_");
$url=DZ.$outs[0];
$ch=curl_init();
curl_setopt($ch,CURLOPT_REFERER,$re_url);
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_USERAGENT,$_SERVER["HTTP_USER_AGENT"]);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_COOKIEFILE,$c1);
curl_setopt($ch,CURLOPT_COOKIEJAR,$_SESSION["cookie_jar"]);
$html=curl_exec($ch);
curl_close($ch);
echo $html;