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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');
}
}