Codeigniter, PHP: Generate date of birth drop downs with sessions in case of errors

gistfile1

// THIS FILE IS A CUSTOM CODEIGNITER CLASS FOR GENERATING DROPDOWNS INCLUDED FROM THE LIBRARIES FOLDER

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 

class Dob_dropdown{
	
    public function buildDayDropdown($name='',$id='',$value='')
    {
        $days='';
        while ( $days <= '31')
		{
            if($days>0)
			{
				$day[$days]=$days;
			}else{
				$day['select a day'] = '';  // PUT ANY DEFAULT VALUE HERE
			}
			$days++;
        }
		$id = 'id='.$id;
        return form_dropdown($name, $day, $value, $id);
    }
	
	function buildYearDropdown($name='',$id='',$value='')
    {        
        $years = range(1900, date("Y"));
		array_unshift($years, 'Select a year');
        foreach($years as $year)
        {
			if($year == 'Select a year'){
            	$year_list['Select a year'] = '';  // PUT ANY DEFAULT VALUE HERE
			}else{
				$year_list[$year] = $year;
			}
        }    
		$id = 'id='.$id;
        return form_dropdown($name, $year_list, $value, $id);
    }
	
	function buildMonthDropdown($name='',$id='',$value='')
    {
        $month=array(
			'Select a month'=>'',   // PUT ANY DEFAULT VALUE HERE
            '01'=>'Jan',
            '02'=>'Feb',
            '03'=>'Mar',
            '04'=>'Apr',
            '05'=>'May',
            '06'=>'Jun',
            '07'=>'Jul',
            '08'=>'Aug',
            '09'=>'Sep',
            '10'=>'Oct',
            '11'=>'Nov',
            '12'=>'Dec');
			
		$id = 'id='.$id;			
        return form_dropdown($name, $month, $value, $id);
    }
	
}

/* End of file dob_dropdown.php */
/* Location: ./application/libraries/dob_dropdown.php */




// ========================  CONTROLLER FILE NO ERRORS

$data['dropday'] = $this->dob_dropdown->buildDayDropdown('drop_day', 'drop_day');
$data['dropmonth'] = $this->dob_dropdown->buildMonthDropdown('drop_month', 'drop_month');
$data['dropyear'] = $this->dob_dropdown->buildYearDropdown('drop_year', 'drop_year');
$data['main_content'] = 'play_view';
$data['header'] = 'includes/page1_header_view';
$data['footer'] = 'includes/footer_view';
$this->load->view('includes/master_page_view', $data);


// ========================  CONTROLLER FILE IF ERRORS

$data['dropday'] = $this->dob_dropdown->buildDayDropdown('drop_day','drop_day', set_value('drop_day', $this->session->userdata('drop_day')));
$data['dropmonth'] = $this->dob_dropdown->buildMonthDropdown('drop_month','drop_month', set_value('drop_month', $this->session->userdata('drop_month')));
$data['dropyear'] = $this->dob_dropdown->buildYearDropdown('drop_year','drop_year', set_value('drop_year', $this->session->userdata('drop_year')));
$data['main_content'] = 'play_view';
$data['header'] = 'includes/page1_header_view';
$data['footer'] = 'includes/footer_view';
// ============================================= MERGE ARRAYS
$data = array_merge($data, $user_exists_result_array, $get_stats_result_array);
$this->load->view('includes/master_page_view', $data);




// ========================  VIEW FILE

if(form_error('drop_day') == TRUE || form_error('drop_month') == TRUE || form_error('drop_year') == TRUE)
{
    echo '<p class="error">Please enter a valid date</p>';
}
echo '<label>Date of Birth* </label>';
echo $dropday;
echo $dropmonth;
echo $dropyear;