addAtributeTo functie OOP

<?php
class Forms {
	
	protected $_inputs;
	private $_method, $_action;
    
    public function __construct($method,$action = NULL)
    {
        $this->_method = $method;
        $this->_action = $action;
    }
    
    public function addInput($type,$name,$value,$placeholder = NULL,$extra = NULL) {
		$this->_inputs[] = array (
								'type' => $type,
								'name' => $name,
								'value' => $value,
								'placeholder' => $placeholder,
								'extra' => $extra
		);
	}
	
	public function addLabel($name,$text) {
		$this->_inputs[] = array (
								'type' => 'label',
								'name' => $name,
                                                                'text' => $text
		
		);
	}
	
	public function addTextarea($name,$value = NULL, $placeholder = NULL) {
		$this->_inputs[] = array (
								'type' => 'textarea',
								'name' => $name,
								'value' => $value,
								'placeholder' => $placeholder	
		);
	}

    public function addAtributeTo($name,$key,$value) {
        $this->_atributes[] = array(
                                'name' => $name,
                                $key => $key,
                                $value => $value
        );

    }

    function printInputs() {
        echo '<pre>';
        print_r($this->_inputs);
        echo '</pre>';
    }
	
	public function printForm2() {
		$html = '<form action="'.$this->_action.'" method="'.$this->_method.'">';
		for ($i = 0; $i < count($this->_inputs); $i++) {
			switch($this->_inputs[$i]['type']) {
				
				case "label":
					$html .= '<label name="'.$this->_inputs[$i]['name'].'">'.$this->_inputs[$i]['text'].'</label>';
					break;
				case "text":
				case "password":
				case "submit":
				case "email":
					$html .= '<input type="'.$this->_inputs[$i]['type'].'" ';
					$html .= ' name="'.$this->_inputs[$i]['name'].'" ';
					$html .= ' value="'.$this->_inputs[$i]['value'].'" ';
					$html.= ' placeholder="'.$this->_inputs[$i]['placeholder'].'" ';

					$html .= '> ';
					$html .= ' '.$this->_inputs[$i]['extra'].'';
					break;	
				case "textarea":
					$html .= '<textarea name="'.$this->_inputs[$i]['name'].' value="'.$this->_inputs[$i]['value'].'" placeholder="'.$this->_inputs[$i]['placeholder'].'"></textarea>';
					break;		
			}
			
		}
		$html .= '</form>';
		return $html;
	}
}
?>

<?php
$form3 = new Forms('post');
$form3->addLabel('username','Username : ');
$form3->addInput('text','username','','Username','<br>');
$form3->addLabel('password','Password : ');
$form3->addInput('password','password','','Password','<br>');
$form3->addInput('submit','submit_login','Login2');

print($form3->printForm2());
?>