ci-bonfire / Sprint

system/libraries/Cart.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 50 and the first side effect is on line 38.

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Shopping Cart Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Shopping Cart
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/cart.html
 * @deprecated	3.0.0	This class is too specific for CI.
 */
class CI_Cart {

	/**
	 * These are the regular expression rules that we use to validate the product ID and product name
	 * alpha-numeric, dashes, underscores, or periods
	 *
	 * @var string
	 */
	public $product_id_rules = '\.a-z0-9_-';

	/**
	 * These are the regular expression rules that we use to validate the product ID and product name
	 * alpha-numeric, dashes, underscores, colons or periods
	 *
	 * @var string
	 */
	public $product_name_rules = '\w \-\.\:';

	/**
	 * only allow safe product names
	 *
	 * @var bool
	 */
	public $product_name_safe = TRUE;

	// --------------------------------------------------------------------------

	/**
	 * Reference to CodeIgniter instance
	 *
	 * @var object
	 */
	protected $CI;

	/**
	 * Contents of the cart
	 *
	 * @var array
	 */
	protected $_cart_contents = array();

	/**
	 * Shopping Class Constructor
	 *
	 * The constructor loads the Session class, used to store the shopping cart contents.
	 *
	 * @param	array
	 * @return	void
	 */
	public function __construct($params = array())
	{
		// Set the super object to a local variable for use later
		$this->CI =& get_instance();

		// Are any config settings being passed manually?  If so, set them
		$config = is_array($params) ? $params : array();

		// Load the Sessions class
		$this->CI->load->driver('session', $config);

		// Grab the shopping cart array from the session table
		$this->_cart_contents = $this->CI->session->userdata('cart_contents');
		if ($this->_cart_contents === NULL)
		{
			// No cart exists so we'll set some base values
			$this->_cart_contents = array('cart_total' => 0, 'total_items' => 0);
		}

		log_message('info', 'Cart Class Initialized');
	}

	// --------------------------------------------------------------------

	/**
	 * Insert items into the cart and save it to the session table
	 *
	 * @param	array
	 * @return	bool
	 */
	public function insert($items = array())
	{
		// Was any cart data passed? No? Bah...
		if ( ! is_array($items) OR count($items) === 0)
		{
			log_message('error', 'The insert method must be passed an array containing data.');
			return FALSE;
		}

		// You can either insert a single product using a one-dimensional array,
		// or multiple products using a multi-dimensional one. The way we
		// determine the array type is by looking for a required array key named "id"
		// at the top level. If it's not found, we will assume it's a multi-dimensional array.

		$save_cart = FALSE;
		if (isset($items['id']))
		{
			if (($rowid = $this->_insert($items)))
			{
				$save_cart = TRUE;
			}
		}
		else
		{
			foreach ($items as $val)
			{
				if (is_array($val) && isset($val['id']))
				{
					if ($this->_insert($val))
					{
						$save_cart = TRUE;
					}
				}
			}
		}

		// Save the cart data if the insert was successful
		if ($save_cart === TRUE)
		{
			$this->_save_cart();
			return isset($rowid) ? $rowid : TRUE;
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Insert
	 *
	 * @param	array
	 * @return	bool
	 */
	protected function _insert($items = array())
	{
		// Was any cart data passed? No? Bah...
		if ( ! is_array($items) OR count($items) === 0)
		{
			log_message('error', 'The insert method must be passed an array containing data.');
			return FALSE;
		}

		// --------------------------------------------------------------------

		// Does the $items array contain an id, quantity, price, and name?  These are required
		if ( ! isset($items['id'], $items['qty'], $items['price'], $items['name']))
		{
			log_message('error', 'The cart array must contain a product ID, quantity, price, and name.');
			return FALSE;
		}

		// --------------------------------------------------------------------

		// Prep the quantity. It can only be a number.  Duh... also trim any leading zeros
		$items['qty'] = (float) $items['qty'];

		// If the quantity is zero or blank there's nothing for us to do
		if ($items['qty'] == 0)
		{
			return FALSE;
		}

		// --------------------------------------------------------------------

		// Validate the product ID. It can only be alpha-numeric, dashes, underscores or periods
		// Not totally sure we should impose this rule, but it seems prudent to standardize IDs.
		// Note: These can be user-specified by setting the $this->product_id_rules variable.
		if ( ! preg_match('/^['.$this->product_id_rules.']+$/i', $items['id']))
		{
			log_message('error', 'Invalid product ID.  The product ID can only contain alpha-numeric characters, dashes, and underscores');
			return FALSE;
		}

		// --------------------------------------------------------------------

		// Validate the product name. It can only be alpha-numeric, dashes, underscores, colons or periods.
		// Note: These can be user-specified by setting the $this->product_name_rules variable.
		if ($this->product_name_safe && ! preg_match('/^['.$this->product_name_rules.']+$/i'.(UTF8_ENABLED ? 'u' : ''), $items['name']))
		{
			log_message('error', 'An invalid name was submitted as the product name: '.$items['name'].' The name can only contain alpha-numeric characters, dashes, underscores, colons, and spaces');
			return FALSE;
		}

		// --------------------------------------------------------------------

		// Prep the price. Remove leading zeros and anything that isn't a number or decimal point.
		$items['price'] = (float) $items['price'];

		// We now need to create a unique identifier for the item being inserted into the cart.
		// Every time something is added to the cart it is stored in the master cart array.
		// Each row in the cart array, however, must have a unique index that identifies not only
		// a particular product, but makes it possible to store identical products with different options.
		// For example, what if someone buys two identical t-shirts (same product ID), but in
		// different sizes?  The product ID (and other attributes, like the name) will be identical for
		// both sizes because it's the same shirt. The only difference will be the size.
		// Internally, we need to treat identical submissions, but with different options, as a unique product.
		// Our solution is to convert the options array to a string and MD5 it along with the product ID.
		// This becomes the unique "row ID"
		if (isset($items['options']) && count($items['options']) > 0)
		{
			$rowid = md5($items['id'].serialize($items['options']));
		}
		else
		{
			// No options were submitted so we simply MD5 the product ID.
			// Technically, we don't need to MD5 the ID in this case, but it makes
			// sense to standardize the format of array indexes for both conditions
			$rowid = md5($items['id']);
		}

		// --------------------------------------------------------------------

		// Now that we have our unique "row ID", we'll add our cart items to the master array
		// grab quantity if it's already there and add it on
		$old_quantity = isset($this->_cart_contents[$rowid]['qty']) ? (int) $this->_cart_contents[$rowid]['qty'] : 0;

		// Re-create the entry, just to make sure our index contains only the data from this submission
		$items['rowid'] = $rowid;
		$items['qty'] += $old_quantity;
		$this->_cart_contents[$rowid] = $items;

		return $rowid;
	}

	// --------------------------------------------------------------------

	/**
	 * Update the cart
	 *
	 * This function permits the quantity of a given item to be changed.
	 * Typically it is called from the "view cart" page if a user makes
	 * changes to the quantity before checkout. That array must contain the
	 * product ID and quantity for each item.
	 *
	 * @param	array
	 * @return	bool
	 */
	public function update($items = array())
	{
		// Was any cart data passed?
		if ( ! is_array($items) OR count($items) === 0)
		{
			return FALSE;
		}

		// You can either update a single product using a one-dimensional array,
		// or multiple products using a multi-dimensional one.  The way we
		// determine the array type is by looking for a required array key named "rowid".
		// If it's not found we assume it's a multi-dimensional array
		$save_cart = FALSE;
		if (isset($items['rowid']))
		{
			if ($this->_update($items) === TRUE)
			{
				$save_cart = TRUE;
			}
		}
		else
		{
			foreach ($items as $val)
			{
				if (is_array($val) && isset($val['rowid']))
				{
					if ($this->_update($val) === TRUE)
					{
						$save_cart = TRUE;
					}
				}
			}
		}

		// Save the cart data if the insert was successful
		if ($save_cart === TRUE)
		{
			$this->_save_cart();
			return TRUE;
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Update the cart
	 *
	 * This function permits changing item properties.
	 * Typically it is called from the "view cart" page if a user makes
	 * changes to the quantity before checkout. That array must contain the
	 * rowid and quantity for each item.
	 *
	 * @param	array
	 * @return	bool
	 */
	protected function _update($items = array())
	{
		// Without these array indexes there is nothing we can do
		if ( ! isset($items['rowid'], $this->_cart_contents[$items['rowid']]))
		{
			return FALSE;
		}

		// Prep the quantity
		if (isset($items['qty']))
		{
			$items['qty'] = (float) $items['qty'];
			// Is the quantity zero?  If so we will remove the item from the cart.
			// If the quantity is greater than zero we are updating
			if ($items['qty'] == 0)
			{
				unset($this->_cart_contents[$items['rowid']]);
				return TRUE;
			}
		}

		// find updatable keys
		$keys = array_intersect(array_keys($this->_cart_contents[$items['rowid']]), array_keys($items));
		// if a price was passed, make sure it contains valid data
		if (isset($items['price']))
		{
			$items['price'] = (float) $items['price'];
		}

		// product id & name shouldn't be changed
		foreach (array_diff($keys, array('id', 'name')) as $key)
		{
			$this->_cart_contents[$items['rowid']][$key] = $items[$key];
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Save the cart array to the session DB
	 *
	 * @return	bool
	 */
	protected function _save_cart()
	{
		// Let's add up the individual prices and set the cart sub-total
		$this->_cart_contents['total_items'] = $this->_cart_contents['cart_total'] = 0;
		foreach ($this->_cart_contents as $key => $val)
		{
			// We make sure the array contains the proper indexes
			if ( ! is_array($val) OR ! isset($val['price'], $val['qty']))
			{
				continue;
			}

			$this->_cart_contents['cart_total'] += ($val['price'] * $val['qty']);
			$this->_cart_contents['total_items'] += $val['qty'];
			$this->_cart_contents[$key]['subtotal'] = ($this->_cart_contents[$key]['price'] * $this->_cart_contents[$key]['qty']);
		}

		// Is our cart empty? If so we delete it from the session
		if (count($this->_cart_contents) <= 2)
		{
			$this->CI->session->unset_userdata('cart_contents');

			// Nothing more to do... coffee time!
			return FALSE;
		}

		// If we made it this far it means that our cart has data.
		// Let's pass it to the Session class so it can be stored
		$this->CI->session->set_userdata(array('cart_contents' => $this->_cart_contents));

		// Woot!
		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Cart Total
	 *
	 * @return	int
	 */
	public function total()
	{
		return $this->_cart_contents['cart_total'];
	}

	// --------------------------------------------------------------------

	/**
	 * Remove Item
	 *
	 * Removes an item from the cart
	 *
	 * @param	int
	 * @return	bool
	 */
	 public function remove($rowid)
	 {
		// unset & save
		unset($this->_cart_contents[$rowid]);
		$this->_save_cart();
		return TRUE;
	 }

	// --------------------------------------------------------------------

	/**
	 * Total Items
	 *
	 * Returns the total item count
	 *
	 * @return	int
	 */
	public function total_items()
	{
		return $this->_cart_contents['total_items'];
	}

	// --------------------------------------------------------------------

	/**
	 * Cart Contents
	 *
	 * Returns the entire cart array
	 *
	 * @param	bool
	 * @return	array
	 */
	public function contents($newest_first = FALSE)
	{
		// do we want the newest first?
		$cart = ($newest_first) ? array_reverse($this->_cart_contents) : $this->_cart_contents;

		// Remove these so they don't create a problem when showing the cart table
		unset($cart['total_items']);
		unset($cart['cart_total']);

		return $cart;
	}

	// --------------------------------------------------------------------

	/**
	 * Get cart item
	 *
	 * Returns the details of a specific item in the cart
	 *
	 * @param	string	$row_id
	 * @return	array
	 */
	public function get_item($row_id)
	{
		return (in_array($row_id, array('total_items', 'cart_total'), TRUE) OR ! isset($this->_cart_contents[$row_id]))
			? FALSE
			: $this->_cart_contents[$row_id];
	}

	// --------------------------------------------------------------------

	/**
	 * Has options
	 *
	 * Returns TRUE if the rowid passed to this function correlates to an item
	 * that has options associated with it.
	 *
	 * @param	string	$row_id = ''
	 * @return	bool
	 */
	public function has_options($row_id = '')
	{
		return (isset($this->_cart_contents[$row_id]['options']) && count($this->_cart_contents[$row_id]['options']) !== 0);
	}

	// --------------------------------------------------------------------

	/**
	 * Product options
	 *
	 * Returns the an array of options, for a particular product row ID
	 *
	 * @param	string	$row_id = ''
	 * @return	array
	 */
	public function product_options($row_id = '')
	{
		return isset($this->_cart_contents[$row_id]['options']) ? $this->_cart_contents[$row_id]['options'] : array();
	}

	// --------------------------------------------------------------------

	/**
	 * Format Number
	 *
	 * Returns the supplied number with commas and a decimal point.
	 *
	 * @param	float
	 * @return	string
	 */
	public function format_number($n = '')
	{
		return ($n === '') ? '' : number_format( (float) $n, 2, '.', ',');
	}

	// --------------------------------------------------------------------

	/**
	 * Destroy the cart
	 *
	 * Empties the cart and kills the session
	 *
	 * @return	void
	 */
	public function destroy()
	{
		$this->_cart_contents = array('cart_total' => 0, 'total_items' => 0);
		$this->CI->session->unset_userdata('cart_contents');
	}

}