PHP - Advise On Best Way To Enter A Birthday On A Form

 
<input type="text" name="Birthday" id="Birthday" maxlength="50" value="
<?php
if($form->value("Birthday") == ""){
   echo $session->userinfo['Birthday'];
}else{
   echo $form->value("Birthday");
}
?>">
 

 function register( $subuser, $subconfirmuser, $subpass, $subconfirmpass, $subemail, $subconfirmemail, $subFirstname, $subLastname, $subGender, $subBirthday, $subRegion, $subCountry, $subCity_State, $subQuestion, $subAnswer, $subConfirmAnswer){
      global $database, $form, $mailer;  //The database, form and mailer object
 
   
 
 

 /* Birthday error checking */
 $field = "Birthday"; //Use field name for Birthday
 if(!$subBirthday || strlen($subBirthday = trim($subBirthday)) == 0){
 $form->setError($field, "* Birthday not entered");
 }
           else{
         /* I've attempted different formulas but it did not work here */
         $date = date('yyyy-mm-dd');
         if( $subBirthday > $date){
            $form->setError($field, "* You are too young!");
         } 
}

 

$today = date("m-d");
$result = mysql_query("SELECT * FROM members WHERE dob = '".$today."'");

<?php

class Action
{
	protected $_request;
	protected $_response;
	protected $_model;
	protected $_view;
		
	public function __construct(Request $request, Response $response)
	{
		$this->set_request($request)->set_response($response)->set_view($request, $response)->set_model();
		
		// if request requires partial then do this
		$partial = Partial::singleton();
		$view    = $this->get_view();
		
		$view->set_partial($partial);
		$partial->set_view(clone $view);
	}

	protected function set_request(Request $request)
	{
		$this->_request = $request;
		return $this;
	}
	
	protected function set_response(Response $response)
	{
		$this->_response = $response;
		return $this;
	}
	
	protected function set_view(Request $request, Response $response)
	{
		$this->_view = new View($request, $response);
		return $this;
	}

	public function get_request()
	{
		return $this->_request;
	}
	
	public function get_response()
	{
		return $this->_response;
	}
	
	public function get_view()
	{
		return $this->_view;
	}
	
	public function dispatch($method, $parameters)
	{
		if ($this->get_request()->is_dispatched())
		{
			if(method_exists($this, $method))
			{
				call_user_func_array(array($this, $method), $parameters);
			}
			else
			{
				echo "unable to load method";
			}
		}
	}
	
	public function __get($property)
	{
		$property = '_' . $property;

		if (property_exists($this, $property) &&
		    $property !== '$this->_request' &&
		    $property !== '$this->_responce')
		{	
			return 	$this->$property;
		}
		
		return false;
	}
	
	public function set_model()
	{		
		$class_name       = get_class($this);
		$model_name       = trim($class_name, "_Controller");
		$model_name       = strtolower($model_name);
		$property_name    = '_' . $model_name;
		$model_name       = Inflection::singularize($model_name);
		$model_name       = ucfirst($model_name);
		$model_class      = $model_name . '_Model';
		
		$this->{$property_name} = new $model_class();
	}
}

<?php

class View
{
	protected $_variables = array();
	protected $_helpers   = array();
	
	public function __construct(Request $request, Response $response)
	{
	}
		
	public function __set($name, $value)
	{
		$this->_variables[$name] = $value;
	}
	
	public function __get($name)
	{
		return $this->_variables[$name];
	}
	
	public function __call($name, $parameters)
	{	
		$helper = $this->get_helper($name);
		
		if (!$helper)
		{
			$helper = call_user_func_array(array(new $name(), '__construct'), $parameters); 
			$this->set_helper($name, $helper);
		}
	
		return $helper;
	}

	protected function set_helper($helper, $instance)
	{
		$this->_helpers[$helper] = $instance;
	}
	
	protected function get_helper($helper)
	{
		if (isset($this->_helpers[$helper]))
		{
			return $this->_helpers[$helper];
		}
		
		return false;
	}
		
	public function set_partial(Partial $partial)
	{
		if ($partial instanceof Partial)
		{
			$this->set_helper('partial', $partial);
		}
	}
	
	public function render($file)
	{
		if (preg_match("/\.html$/i", $file))
		{			
			require_once PRIVATE_DIRECTORY . 'application' . DS . 'views' . DS . $file;
		}
	}
}

<?php

class Partial
{
	protected $_view;
	protected $_templates;

	protected static $_instance = null;
	
	public static function singleton()
	{
		if (self::$_instance == null)
		{
			self::$_instance = new self();
		}
	
		return self::$_instance;
	}
	
	public function set_view(View $view)
	{
		$this->_view = $view;
	}
	
	public function __set($name, $options = array())
	{
		$this->_templates[$name]; 
		$this->_templates[$name]['path']      = $options[0];
		$this->_templates[$name]['variables'] = $options[1];
	}
	
	public function __get($name)
	{
		// when $this->paertial()->header; is called in view template 
		// it extracts variables and includes template view render() method
		
		$file      = $this->_templates[$name]['path'];
		$variables = $this->_templates[$name]['variables'];
	}
}