## mark a section (Learn more)

<? class Chat{ private $prefix; private $msg_life; private $mem; private $poll_duration; function __construct($prefix, $msg_life = 604800, $poll_duration = 50, $allow_creation = false){ $this->prefix = $prefix; $this->msg_life = $msg_life; $this->poll_duration = $poll_duration; $this->mem = new Memcache; $this->mem->connect('localhost', 11211); if($this->mem->get($this->prefix.'chats_num') == false) if($allow_creation) $this->mem->set($this->prefix.'chats_num',0,0,$this->msg_life); else{ unset($this); throw new Exception('Chat Group does not exist'); } } function alive(){ return !empty($this->mem); } function poll($last){ $start = time(); while($this->mem->get($this->prefix.'chats_num') <= $last && $start+$this->poll_duration > time()) usleep(500000); $chats = array(); $end = $this->mem->get($this->prefix.'chats_num'); if($end - 10 > $last) $last = $end - 10; for($i=$last+1;$i<=$end;$i++){ $msg = $this->mem->get($this->prefix."chatmsg_$i"); $msg['index'] = $i; //preg_match_all("//",$msg,$matches); $chats[] = $msg; } return Chat::slashes($chats); } function post($name,$text){ $this->mem = new Memcache; $this->mem->connect('localhost', 11211); $i = $this->mem->get($this->prefix.'chats_num') + 1; $msg = array( 'name'=>substr($name,0,30), 'text'=>substr($text,0,512), 'time'=>time()); $this->mem->set($this->prefix."chatmsg_$i",$msg,0,$this->msg_life); $this->mem->set($this->prefix.'chats_num',$i,0,$this->msg_life); return $i; } static function slashes($n){ foreach($n as $k=>$v){ foreach($v as $k1=>$v1){ $n[$k][$k1] = stripslashes(htmlspecialchars($v1)); } } return $n; } } ?>

This paste will be private.