PHP Klasse fejl (Igen...)

Kode 

<?php

    class Guestbook
    {
        public $template = "GUESTBOOK_NAME - GUESTBOOK_DATE<br />GUESTBOOK_MESSAGE<br />br />";
        public $allMessages = array(array("id", "names", "dates" , "messages"));
        public $timeFormat = "d-m-y H:i"; // 27-5-08 16:28
        public $mysqlTableName = "Guestbook";
        public $sortType = "DESC";

        public $pageFunction = false;
        public $returnErrors = true;
        public $stripHTMLTags = true;

        function setTemplate($newTemplate)
        {
            $this->template = $newTemplate;
        }

        function setPageFunction($theBool)
        {
            $this->pageFunction = $theBool;
        }

        function setReturnErrors($theBool)
        {
            $this->returnErrors = $theBool;
        }

        function setStripHTMLTags($theBool)
        {
            $this->stripHTMLTags = $theBool;
        }

        function listMessages()
        {
            getMessages();
            $allMessagesSize = count($this->allMessages);

            for($i = 0; $i < $allMessagesSize; $i++)
            {
                $text = str_replace("GUESTBOOK_NAME", $this->allMessages["names"][$i], $this->template);
                $text = str_replace("GUESTBOOK_DATE", $this->allMessages["dates"][$i], $this->template);
                $text = str_replace("GUESTBOOK_MESSAGE", $this->allMessages["messages"][$i], $this->template);

                echo $text;
            }
        }

        function getMessages()
        {
            if(tableExist($this->mysqlTableName))
            {
                if($this->returnErrors)
                    $query = mysql_query("SELECT * FROM " . $this->mysqlTableName) OR DIE("Error: " . mysql_error());
                else
                    $query = mysql_query("SELECT * FROM " . $this->mysqlTableName);

                $this->allMessages = mysql_fetch_assoc($query);
            }
        }

        function addMessage($senderName, $senderMessage)
        {
            if(empty($senderName) || empty($senderMessage))
                return false;
            else
            {
                if(tableExist($this->mysqltableName))
                {
                    $query = "INSERT INTO " . $this->mysqlTableName . " (name, date, message) VALUES ('" . $senderName . "', '". date($this->timeFormat) . "', '" . $senderMessage . "')";

                    if($this->returnErrors)
                        mysql_query($query) OR DIE("Errors: " . mysql_error());
                    else
                        mysql_query($query);

                    return true;
                }
            }
        }

        function tableExist($tableName)
        {
            if(mysql_num_rows(mysql_query("SHOW TABLES LIKE '" . $tableName . "'")))
                return true;
            else
            {
                $query = "CREATE TABLE " . $tableName . "(id INT(11) NOT NULL PRIMARY KEY AUTO_INCREMENT, name VARCHAR(255), date DATETIME, message TEXT)";
                if($this->returnErrors)
                    $createTable = mysql_query($query) OR DIE("Error: " . mysql_error());
                else
                    $createTable = mysql_query($query);

                if(mysql_num_rows(mysql_query("SHOW TABLES LIKE '" . $tableName . "'")))
                    return true;
                else
                    return false;
            }
        }

    }

    $guestbook = new Guestbook();

    $guestbook->addMessage("Jakob", "This is just a test, just fo sure!!");
    $guestbook->listMessages();
    echo "Everything works!";

?>