PHP购物车类，移植于CodeIgniter
<?php/** * 购物车程序 Modified by CodeIgniter * */class cart {// 对产品ID和产品名称进行正则验证属性var $product_id_rules= '\.a-z0-9_-';var $product_name_rules= '\.\:\-_ a-z0-9'; // 考虑到汉字，该功能暂不使用// 私有变量var $_cart_contents= array();/** * 构造方法 * */public function __construct(){if ($this->session('cart_contents') !== FALSE){$this->_cart_contents = $this->session('cart_contents');}else{// 初始化数据$this->_cart_contents['cart_total'] = 0;$this->_cart_contents['total_items'] = 0;}}// --------------------------------/** * 添加到购物车 * * @accesspublic * @paramarray * @returnbool */function insert($items = array()){// 检测数据是否正确if ( ! is_array($items) OR count($items) == 0){return FALSE;}// 可以添加一个商品（一维数组），也可以添加多个商品（二维数组）$save_cart = FALSE;if (isset($items['id'])){if ($this->_insert($items) == TRUE){$save_cart = TRUE;}}else{foreach ($items as $val){if (is_array($val) AND isset($val['id'])){if ($this->_insert($val) == TRUE){$save_cart = TRUE;}}}}// 更新数据if ($save_cart == TRUE){$this->_save_cart();return TRUE;}return FALSE;}// --------------------------------/** * 处理插入购物车数据 * * @accessprivate * @paramarray * @returnbool */function _insert($items = array()){// 检查购物车if ( ! is_array($items) OR count($items) == 0){return FALSE;}// --------------------------------/* 前四个数组索引 (id, qty, price 和name) 是 必需的。 如果缺少其中的任何一个，数据将不会被保存到购物车中。 第5个索引 (options) 是可选的。当你的商品包含一些相关的选项信息时，你就可以使用它。 请使用一个数组来保存选项信息。注意：$data['price'] 的值必须大于0 如：$data = array( 'id' => 'sku_123ABC', 'qty' => 1, 'price' => 39.95, 'name' => 'T-Shirt', 'options' => array('Size' => 'L', 'Color' => 'Red') );*/if ( ! isset($items['id']) OR ! isset($items['qty']) OR ! isset($items['price']) OR ! isset($items['name'])){return FALSE;}// --------------------------------// 数量验证，不是数字替换为空$items['qty'] = trim(preg_replace('/([^0-9])/i', '', $items['qty']));// 数量验证$items['qty'] = trim(preg_replace('/(^[0]+)/i', '', $items['qty']));// 数量必须是数字或不为0if ( ! is_numeric($items['qty']) OR $items['qty'] == 0){return FALSE;}// --------------------------------// 产品ID验证if ( ! preg_match("/^[".$this->product_id_rules."]+$/i", $items['id'])){return FALSE;}// --------------------------------// 验证产品名称，考虑到汉字，暂不使用/*if ( ! preg_match("/^[".$this->product_name_rules."]+$/i", $items['name'])){return FALSE;}*/// --------------------------------// 价格验证$items['price'] = trim(preg_replace('/([^0-9\.])/i', '', $items['price']));$items['price'] = trim(preg_replace('/(^[0]+)/i', '', $items['price']));// 验证价格是否是数值if ( ! is_numeric($items['price'])){return FALSE;}// --------------------------------// 属性验证，如果属性存在，属性值+产品ID进行加密保存在$rowid中if (isset($items['options']) AND count($items['options']) > 0){$rowid = md5($items['id'].implode('', $items['options']));}else{// 没有属性时直接对产品ID加密$rowid = md5($items['id']);}// 检测购物车中是否有该产品，如果有，在原来的基础上加上本次新增的商品数量$_contents = $this->_cart_contents;$_tmp_contents = array();foreach ($_contents as $val){if (is_array($val) AND isset($val['rowid']) AND isset($val['qty']) AND $val['rowid']==$rowid){$_tmp_contents[$val['rowid']]['qty'] = $val['qty'];} else {$_tmp_contents[$val['rowid']]['qty'] = 0;}}// --------------------------------// 清除原来的数据unset($this->_cart_contents[$rowid]);// 重新赋值$this->_cart_contents[$rowid]['rowid'] = $rowid;// 添加新项目foreach ($items as $key => $val){if ($key=='qty' && isset($_tmp_contents[$rowid][$key])) {$this->_cart_contents[$rowid][$key] = $val+$_tmp_contents[$rowid][$key];} else {$this->_cart_contents[$rowid][$key] = $val;}}return TRUE;}// --------------------------------/** * 更新购物车 * * @accesspublic * @paramarray * @paramstring * @returnbool */function update($items = array()){// 验证if ( ! is_array($items) OR count($items) == 0){return FALSE;}$save_cart = FALSE;if (isset($items['rowid']) AND isset($items['qty'])){if ($this->_update($items) == TRUE){$save_cart = TRUE;}}else{foreach ($items as $val){if (is_array($val) AND isset($val['rowid']) AND isset($val['qty'])){if ($this->_update($val) == TRUE){$save_cart = TRUE;}}}}if ($save_cart == TRUE){$this->_save_cart();return TRUE;}return FALSE;}// --------------------------------/** * 处理更新购物车 * * @accessprivate * @paramarray * @returnbool */function _update($items = array()){if ( ! isset($items['qty']) OR ! isset($items['rowid']) OR ! isset($this->_cart_contents[$items['rowid']])){return FALSE;}// 检测数量$items['qty'] = preg_replace('/([^0-9])/i', '', $items['qty']);if ( ! is_numeric($items['qty'])){return FALSE;}if ($this->_cart_contents[$items['rowid']]['qty'] == $items['qty']){return FALSE;}if ($items['qty'] == 0){unset($this->_cart_contents[$items['rowid']]);}else{$this->_cart_contents[$items['rowid']]['qty'] = $items['qty'];}return TRUE;}// --------------------------------/** * 保存购物车到Session里 * * @accessprivate * @returnbool */function _save_cart(){unset($this->_cart_contents['total_items']);unset($this->_cart_contents['cart_total']);$total = 0;$items = 0;foreach ($this->_cart_contents as $key => $val){if ( ! is_array($val) OR ! isset($val['price']) OR ! isset($val['qty'])){continue;}$total += ($val['price'] * $val['qty']);$items += $val['qty'];$this->_cart_contents[$key]['subtotal'] = ($this->_cart_contents[$key]['price'] * $this->_cart_contents[$key]['qty']);}$this->_cart_contents['total_items'] = $items;$this->_cart_contents['cart_total'] = $total;if (count($this->_cart_contents) <= 2){$this->session('cart_contents', array());return FALSE;}$this->session('cart_contents',$this->_cart_contents);return TRUE;}// --------------------------------/** * 购物车中的总计金额 * * @accesspublic * @returninteger */function total(){return $this->_cart_contents['cart_total'];}// --------------------------------/** * 购物车中总共的项目数量 * * * @accesspublic * @returninteger */function total_items(){return $this->_cart_contents['total_items'];}// --------------------------------/** * 购物车中所有信息的数组 * * 返回一个包含了购物车中所有信息的数组 * * @accesspublic * @returnarray */function contents(){$cart = $this->_cart_contents;unset($cart['total_items']);unset($cart['cart_total']);return $cart;}// --------------------------------/** * 购物车中是否有特定的列包含选项信息 * * 如果购物车中特定的列包含选项信息，本函数会返回 TRUE(布尔值)，本函数被设计为与 contents() 一起在循环中使用 * * @accesspublic * @returnarray */function has_options($rowid = ''){if ( ! isset($this->_cart_contents[$rowid]['options']) OR count($this->_cart_contents[$rowid]['options']) === 0){return FALSE;}return TRUE;}// --------------------------------/** * 以数组的形式返回特定商品的选项信息 * * 本函数被设计为与 contents() 一起在循环中使用 * * @accesspublic * @returnarray */function product_options($rowid = ''){if ( ! isset($this->_cart_contents[$rowid]['options'])){return array();}return $this->_cart_contents[$rowid]['options'];}// --------------------------------/** * 格式化数值 * * 返回格式化后带小数点的值（小数点后有2位），一般价格使用 * * @accesspublic * @returninteger */function format_number($n = ''){if ($n == ''){return '';}$n = trim(preg_replace('/([^0-9\.])/i', '', $n));return number_format($n, 2, '.', ',');}// --------------------------------/** * 销毁购物车 * * 这个函数一般是在处理完用户订单后调用 * * @accesspublic * @returnnull */function destroy(){unset($this->_cart_contents);$this->_cart_contents['cart_total'] = 0;$this->_cart_contents['total_items'] = 0;$this->session('cart_contents', array());}// --------------------------------/** * 保存Session * * 须有session_start(); * * @accessprivate * @returnbool */function session($name = 'cart_contents',$value = NULL) {if ($name=='') $name = 'cart_contents';if ($value == NULL) {return @$_SESSION[$name];} else {if (!empty($value) && is_array($value)) {$_SESSION[$name] = $value;return TRUE;} else {return FALSE;}}}}?>