Ban uživatele Luky12345, Lukyno111, Jarunka14, Houmeree atd.

<a  onclick="sit_down(\'<? echo ($i+1); ?>\')" href="http://localhost/pokus/pokus.php" target="_self">XXXXX</a>

<?php
$xml=simplexml_load_file($root."tvorba-webu.xml");
$index = 1;

foreach ($xml->channel->item as $item){
if($index > 3){ break; }
$index++;
$date = $item->pubDate;
$link = $item->link;
$title = $item->title;
$desc =$item->description;
$cat = $item->category;

$date = strtotime($date);
$date = StrFTime("%d. %m. %Y", $date);
$date = str_replace(". 0", ". ", $date);
$num = strlen($date);
if(substr($date, 0, 1) == "0") $date = substr($date, 1, $num);


echo $date." - <a href=\"".$link."\">".$title."</a>";
echo "<br />".$desc."<br /><br />";
}

?>

<?php session_start();
Header("Pragma: no-cache");
Header("Expires: ".GMDate("D, d m Y H:i:s")." GMT");
Header("Cache-control: no-cache");
Header('Content-Type:text/html; charset=utf-8');
require_once($_SERVER['DOCUMENT_ROOT'].'/conf/sql.php');
if($_GET['action'] == "chatheartbeat"){chatHeartbeat();} 
if($_GET['action'] == "sendchat"){sendChat();} 
if($_GET['action'] == "closechat"){closeChat();} 
if($_GET['action'] == "startchatsession"){startChatSession();} 
if(!isset($_SESSION['chatHistory'])){
    $_SESSION['chatHistory'] = array();    
}
if(!isset($_SESSION['openChatBoxes'])){
    $_SESSION['openChatBoxes'] = array();    
}

function chatHeartbeat(){
    $query = mysql_query("SET NAMES 'utf8'");
    $sql = "select * from chat where (chat.to = '".mysql_real_escape_string($_SESSION['username'])."' AND recd = 0) order by id DESC";
    $query = mysql_query($sql);
    $items = '';
    $chatBoxes = array();
    while($chat = mysql_fetch_array($query)){
        if(!isset($_SESSION['openChatBoxes'][$chat['from']]) && isset($_SESSION['chatHistory'][$chat['from']])){
            $items = $_SESSION['chatHistory'][$chat['from']];
        }
        $chat['message'] = sanitize($chat['message']);
        $items .= <<<EOD
   {
            "s": "0",
            "f": "{$chat['from']}",
            "m": "{$chat['message']}"
       },
EOD;

    if(!isset($_SESSION['chatHistory'][$chat['from']])){
        $_SESSION['chatHistory'][$chat['from']] = '';
    }
    $_SESSION['chatHistory'][$chat['from']] .= <<<EOD
    {
            "s": "0",
            "f": "{$chat['from']}",
            "m": "{$chat['message']}"
       },
EOD;
        unset($_SESSION['tsChatBoxes'][$chat['from']]);
        $_SESSION['openChatBoxes'][$chat['from']] = $chat['sent'];
    }

    if(!empty($_SESSION['openChatBoxes'])){
    foreach($_SESSION['openChatBoxes'] as $chatbox => $time){
        if(!isset($_SESSION['tsChatBoxes'][$chatbox])){
            $now = time()-strtotime($time);
            $time = date('d.m.Y v H:i:s', strtotime($time));
            $message = "Naposledy: ".$time;
            if($now > 180){
                $items .= <<<EOD
{
"s": "2",
"f": "$chatbox",
"m": "{$message}"
},
EOD;

    if(!isset($_SESSION['chatHistory'][$chatbox])){
        $_SESSION['chatHistory'][$chatbox] = '';
    }
    $_SESSION['chatHistory'][$chatbox] .= <<<EOD
        {
"s": "2",
"f": "$chatbox",
"m": "{$message}"
},
EOD;
            $_SESSION['tsChatBoxes'][$chatbox] = 1;
        }
        }
    }
}

  $query = mysql_query("SET NAMES 'utf8'");
    $sql = "update chat set recd = 1 where chat.to = '".mysql_real_escape_string($_SESSION['username'])."' and recd = 0";
    $query = mysql_query($sql);
    if($items != ''){
        $items = substr($items, 0, -1);
    }
header('Content-type: application/json');
?>
{
        "items": [
            <?php echo $items;?>
        ]
}
<?php
exit(0);
}

function chatBoxSession($chatbox){
    $items = '';
    if (isset($_SESSION['chatHistory'][$chatbox])) {
        $items = $_SESSION['chatHistory'][$chatbox];
    }
    return $items;
}

function startChatSession(){
    $items = '';
    if(!empty($_SESSION['openChatBoxes'])){
        foreach($_SESSION['openChatBoxes'] as $chatbox => $void){
            $items .= chatBoxSession($chatbox);
        }
    }


    if($items != ''){
        $items = substr($items, 0, -1);
    }
header('Content-type: application/json');
?>
{
        "username": "<?php echo $_SESSION['username'];?>",
        "items": [
            <?php echo $items;?>
        ]
}
<?php
    exit(0);
}

function sendChat(){
  $text_body = '...';
  $table = array ('negr' => $text_body);
  $xhtml=$_POST['message'];
  $xhtml=ereg_replace('[a-zA-Z]+://(([.]?[a-zA-Z0-9_/?$&-=%])*)', ' |!|',$xhtml);
  $xhtml=ereg_replace('(^| )(www([-]*[.]?[a-zA-Z0-9_/?&-=%])*)', ' |!|',$xhtml);
    $from = $_SESSION['username'];
    $to = $_POST['to'];
    $message = strtr($xhtml, $table);
    $_SESSION['openChatBoxes'][$_POST['to']] = date('Y-m-d H:i:s', time());
    $messagesan = sanitize($message);
    $_SESSION['openChatBoxes'][$_POST['to']] = date('Y-m-d H:i:s', time());
    $messagesan = sanitize($message);
    if(!isset($_SESSION['chatHistory'][$_POST['to']])){
        $_SESSION['chatHistory'][$_POST['to']] = '';
    }
    $_SESSION['chatHistory'][$_POST['to']] .= <<<EOD
  {
            "s": "1",
            "f": "{$to}",
            "m": "{$messagesan}"
  },
EOD;
    unset($_SESSION['tsChatBoxes'][$_POST['to']]);
  $zjisti_prosle = date("Y-m-d H:i:s", strtotime("- 5 minutes"));
  $sqlf = mysql_query("SELECT id FROM chat WHERE sent < '".$zjisti_prosle."'");
  while($rowf = mysql_fetch_array($sqlf)){
  mysql_query("DELETE FROM chat WHERE id='".$rowf["id"]."'");
  }
  $query = mysql_query("SET NAMES 'utf8'");
    $sql = "insert into chat (chat.from,chat.to,message,sent) values ('".mysql_real_escape_string($from)."', '".mysql_real_escape_string($to)."','".mysql_real_escape_string($message)."',NOW())";
    $query = mysql_query($sql);
    echo "1";
    exit(0);
}

function closeChat(){
    unset($_SESSION['openChatBoxes'][$_POST['chatbox']]);
    echo "1";
    exit(0);
}

function sanitize($text){
  $tabl = array(":-)" => "<img src='/img/smajl/2.gif'>",":)" => "<img src='/img/smajl/2.gif'>",":-(" => "<img src='/img/smajl/3.gif'>",":(" => "<img src='/img/smajl/3.gif'>",":-))" => "<img src='/img/smajl/1.gif'>",":))" => "<img src='/img/smajl/1.gif'>",":-*" => "<img src='/img/smajl/15.gif'>",";-)" => "<img src='/img/smajl/29.gif'>");
    $text = strip_tags($text, ENT_QUOTES);
    $text = strtr($text, $tabl);
    $text = str_replace("\n\r","\n",$text);
    $text = str_replace("\r\n","\n",$text);
    $text = str_replace("\n","<br>",$text);
    return $text;
}