دریافت پارامتر از فرم در صفحه ای به غیر از صفحه ای که action میفرستد

سلام وقت بخیر
صفحه register

include ('userClass.php');

	$userClass = new user();

	$firstName = isset($_POST['firstName'])? $_POST['firstName'] : '' ;
	$lastName = isset($_POST['lastName'])? $_POST['lastName'] : '' ;
	$userName = isset($_POST['userName'])? $_POST['userName'] : '' ;
	$password = isset($_POST['password'])? $_POST['password'] : '' ;
	$confirmPassword = isset($_POST['confirmPassword'])? $_POST['confirmPassword'] : '' ;
	
	if (isset($_POST['submit']) ) 
	{
		$userClass -> register( $userName , $password , $firstName , $lastName , $confirmPassword ) ;

صفحه userclass

session_start();

include( 'myValidForm.php' ) ;
include( 'myDB.php' ) ;
	
class user
{
	private $user_id ;
	private $user_pass ;
	private $first_name ;
	private $last_name ;
	private $user_passConf ;
	public $validForm ;
	public $main_page ;
	
	function __construct() 
	{
		$this -> validForm = new myValidForm() ;
		$this -> myDB = new myDB() ;
		$this -> myDB -> DB_select() ;
	}
	
	function setPass( $password ) 
	{	
		if ( $this -> validForm -> IsPass( $password ) )		
		{
			if( $this -> validForm -> check_new_password ( $userName , $confirmPassword ) )
			{
				return $this -> user_pass = $password ;
			}
		}
	}
	
	function setUserName($userName) 
	{
		if ( $this -> validForm -> IsEmail ( $userName ) ) 
		{
			return $this -> user_id = $userName ; 
		}
	}
	function setName($firstName , $lastName) 
	{
		if ( $this -> validForm -> IsText ( $firstName ) && $this -> validForm -> IsText ( $lastName ) ) 
		{
			
			return $this -> first_name = $firstName ;
			return $this -> last_name = $lastName ;
		}
	}
	function register( $userName , $password , $firstName , $lastName , $confirmPassword )
	{
		if( !($this -> validForm -> IsEmpty ($userName)  && $this -> validForm -> IsEmpty ($password) && $this -> validForm -> IsEmpty ($confirmPassword)))
		{
			
			$this -> setPass ($password) ;
			$this -> setUserName ($userName) ;
			$this -> setName ($firstName , $lastName) ;

			$this -> myDB -> insert( $this -> myDB -> table , $this -> myDB -> feilds , $this -> myDB -> value ) ; // value
		} 
	} // End method register()
		
	function login ( $userName , $password ) 
	{
		if ( !($this -> validForm -> IsEmpty ($userName)  && $this -> validForm -> IsEmpty ($password)  ) ) 
		{
			$this -> setUserName ($userName) ;
			if ( $this -> validForm -> IsPass( $userName ) )
			{
				$this -> user_pass = $password ;
			}
			$this -> setUser () ;	
		}
	} // End method login()
	
	function setUser () 
	{
		$_SESSION['user'] = $this -> user_id ;
		$_SESSION['password'] = $this -> user_pass ;
		
		$next_page = $this -> main_page ;
		header ( 'location :'. $next_page ) ;
		 
	} // End method setUser()		
}// End userClass

صفحه myDB

include('../userClass1/DB_config.php') ;

	class myDB 
	{
		public $table = 'register';
		public $feilds = array('userName' , 'password' , 'firstName' , 'lastName') ;
		//public $value = array('$userName' , '$password' , '$firstName' , '$lastName' ) ;		
		//public $con ;
		
		function connect()
		{
		    $con = mysql_connect(DB_server , DB_user , DB_password) ;
			return $con  ;
		} // End connect() method
		
		function DB_connect()
		{
			if(! $this -> connect())
				die ('connect to DB faild : '.mysql_error()) ;
		} // End DB_connect() method
		
		function dataBase()
		{
			$dataBase = mysql_select_db(DB_name , $this -> connect()) ;
			//echo DB_name .'<br/>' ;
			return $dataBase ;
		}// End dataBase() mothod
		
		function DB_select()
		{
			if(! $this -> dataBase())
				die('select database faild : '.mysql_error()) ;
		}// End DB_select() method
		
		function exec($sql)
		{
			return $res = mysql_query($sql) ;
		}// End exec() method
	
		function insert($table , $feilds , $value )
		{
			 $value = implode("','" , $value) ; // محتوای صفحه register اینجا لازمه
			 $feilds = implode(',' , $feilds) ;
			
			return $this -> exec('INSERT INTO '.$table.'('.$feilds.') VALUES ('.$value.')' ) ;
		}// End insert() method
		
		function fetch_array($res)
		{
			return mysql_fetch_array($res) ;
		}// End fetch_array() method
		
		function select($fields="*", $table, $conditions="", $options=array())
		{
			$sql = "SELECT ".$fields." FROM ". $table ;
			if($conditions != "")
			{
				$sql .= " WHERE ".$conditions ;
			}
			if(isset($options['order_by']))
			{
				$sql .= " ORDER BY ".$options['order_by'] ;
				if(isset($options['order_dir']))
				{
					$sql .= " ".my_strtoupper($options['order_dir']) ;
				}
			}
			if(isset($options['limit_start']) && isset($options['limit']))
			{
				$sql .= " LIMIT ".$options['limit_start'].", ".$options['limit'] ;
			}
			else
				if(isset($options['limit']))
				{
					$sql .= " LIMIT ".$options['limit'] ;
				}
			return $this->exec($sql) ;
		}// End selec() method

	}// End myDB class

برا اینکه محتوای value رو بشه داخل صفحه myDB داشته باشم باید چیکار کرد؟