Hi guys! Since I'm not a member of any PHP forum and I'm just trying to play with PHP OOP (for some extra cash and some fun hehehe)

I have a class which implements an interface...

<?php
//require_once("dao_includes.php");

class MySQLDAO implements DAO
{
    private $username;
    private $password;
    private $host;
    private $port;

    private $dsn;

    private static $instance;


    private function __construct($_username, $_password, $_host, $_port)
    {
        $username = $_username;
        $password = $_password;
        $host = $_host;
        $port = $_port;

        $dsn = $host . ":" . $port;
 
        //echo "Constructing MySQLDAO...<br/>";
    }


    /**
     *
     * @override
     */
    public function initializeConnection()
    {
        echo "username: " . $username . "<br/>";
        echo "dsn: " . $dsn;
        mysql_connect($dsn, $username, $password) or die("Cannot connect to MySQL Database");
    }


    /**
     *
     * Returns only a single instance
     */
    public static function getInstance()
    {
        if ( !isset($instance) )
        {
            //require_once("mysql_connection_properties.php");

            //$instance = new MySQLDAO($MYSQL_USERNAME, $MYSQL_PASSWORD, $MYSQL_HOST,

$MYSQL_PORT);
           
            $instance = new MySQLDAO("root", "admin456", localhost, "3306");

            //return self::$instance;
            return $instance;
        }
    }


}


?>

Now, this is instantiated from a factory class...

<?php
require_once("dao_essentials.php");




class DAOFactory
{
    public static $MYSQL_DAO = 1;

    public static function getDAO($db)
    {
        return MySQLDAO::getInstance();
    }

}


?>

and eventually, I make an instance of MySQLDAO like this...

<?php require_once("db/dao_essentials.php"); ?>

<?php

//phpinfo();
$dao = DAOFactory::getDAO( DAOFactory::$MYSQL_DAO );
$dao->initializeConnection();
?>


Although the call to initializeConnection() succeeds(I can get the MySQLDAO object), my member variables $username, $password, etc. are all empty when I try to print it! Why is that?

Thanks! 

Problem solved. I just had to do $this->username. It's odd though...

 

ha ha, one of those PHP gotchas

unsolicited advice: don't code PHP like you're coding Java. 

Oh no!!!! Lolz!