GoCart 'Local collection' shipping method

collection.php

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

class collection
{
	var $CI;

	function __construct()
	{
		$this->CI =& get_instance();
		$this->CI->load->model('Settings_model');
	}
	
	function rates()
	{
		//rates function should return an array of rates/prices
		//this is so a UPS function could perhaps return multiple shipping rates
		//setting up some sort of database setting for this is ok
		$settings	= $this->CI->Settings_model->get_settings('collection');
		
		if($settings['enabled'] && $settings['enabled'] > 0)
		{
			return array('Collection' => 0);
		}
		else
		{
			return array();
		}
		
	}
	
	function install()
	{
		//set a default blank setting for collection
		$this->CI->Settings_model->save_settings('collection', array('rate'=>''));
		$this->CI->Settings_model->save_settings('collection', array('enabled'=>'0'));
	}
	
	function uninstall()
	{
		$this->CI->Settings_model->delete_settings('collection');
	}
	
	function form($post	= false)
	{
		//this same function processes the form
		if(!$post)
		{
			$settings	= $this->CI->Settings_model->get_settings('collection');
			$rate		= 0;
			$enabled	= $settings['enabled'];
		}
		else
		{
			$rate		= 0;
			$enabled	= $post['enabled'];
		}
		
		$form	= '<table>
		<tr><td>Enabled: </td><td><select name="enabled">';
		if($enabled == 1)
		{
			$enable		= ' selected="selected"';
			$disable	= '';
		}
		else
		{
			$enable		= '';
			$disable	= ' selected="selected"';
		}
		$form	.= '<option value="1"'.$enable.'>Enabled</option>
		<option value="0"'.$disable.'>Disabled</option>';
		$form	.= '</select></td></tr>
		</table>';
		return $form;
	}
	
	function check()
	{	
		$error	= false;
		
		//we save the settings if it gets here
		$this->CI->Settings_model->save_settings('collection', array(
			'rate' =>0,
			'enabled' => $_POST['enabled']
		));
		
		return false;

	}
}