php实现仿写CodeIgniter的购物车类 本文实例讲述了php实现仿写CodeIgniter的购物车类。分享给大家供大家参考。具体如下： 这里仿写CodeIgniter的购物车类 购物车基本功能： 1) 将物品加入购物车 2) 从购物车中删除物品 3) 更新购物车物品信息 【+1/-1】 4) 对购物车物品进行统计 1. 总项目 2. 总数量 3. 总金额 5) 对购物单项物品的数量及金额进行统计 6) 清空购物车 cart.php文件如下：  _cart_contents = $_SESSION['cart_contents']; } else { $this->_cart_contents['cart_total'] = 0; $this->_cart_contents['total_items'] = 0; } if($this->debug === TRUE) { //$this->_log("cart_create_success"); } } /** * 将物品加入购物车 * * @access public * @param array 一维或多维数组,必须包含键值名: id -> 物品ID标识, qty -> 数量(quantity), price -> 单价(price), name -> 物品姓名 * @return bool */ public function insert($items = array()) { //输入物品参数异常 if( ! is_array($items) OR count($items) == 0) { if($this->debug === TRUE) { $this->_log("cart_no_items_insert"); } return FALSE; } //物品参数处理 $save_cart = FALSE; if(isset($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) { $save_cart = TRUE; } } } } //当插入成功后保存数据到session if($save_cart) { $this->_save_cart(); return TRUE; } return FALSE; } /** * 更新购物车物品信息 * * @access public * @param array * @return bool */ public function update($items = array()) { //输入物品参数异常 if( !is_array($items) OR count($items) == 0) { if($this->debug === TRUE) { $this->_log("cart_no_items_insert"); } return FALSE; } //物品参数处理 $save_cart = FALSE; if(isset($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) { $save_cart = TRUE; } } } } //当更新成功后保存数据到session if($save_cart) { $this->_save_cart(); return TRUE; } return FALSE; } /** * 获取购物车物品总金额 * * @return int */ public function total() { return $this->_cart_contents['cart_total']; } /** * 获取购物车物品种类 * * @return int */ public function total_items() { return $this->_cart_contents['total_items']; } /** * 获取购物车 * * @return array */ public function contents() { return $this->_cart_contents; } /** * 获取购物车物品options * * @param string * @return array */ public function options($rowid = '') { if($this->has_options($rowid)) { return $this->_cart_contents[$rowid]['options']; } else { return array(); } } /** * 清空购物车 * */ public function destroy() { unset($this->_cart_contents); $this->_cart_contents['cart_total'] = 0; $this->_cart_contents['total_items'] = 0; unset($_SESSION['cart_contents']); } /** * 判断购物车物品是否有options选项 * * @param string * @return bool */ private function has_options($rowid = '') { if( ! isset($this->_cart_contents[$rowid]['options']) OR count($this->_cart_contents[$rowid]['options']) === 0) { return FALSE; } return TRUE; } /** * 插入数据 * * @access private * @param array * @return bool */ private function _insert($items = array()) { //输入物品参数异常 if( ! is_array($items) OR count($items) == 0) { if($this->debug === TRUE) { $this->_log("cart_no_data_insert"); } return FALSE; } //如果物品参数无效（无id/qty/price/name） if( ! isset($items['id']) OR ! isset($items['qty']) OR ! isset($items['price']) OR ! isset($items['name'])) { if($this->debug === TRUE) { $this->_log("cart_items_data_invalid"); } return FALSE; } //去除物品数量左零及非数字字符 $items['qty'] = trim(preg_replace('/([^0-9])/i', '', $items['qty'])); $items['qty'] = trim(preg_replace('/^([0]+)/i', '', $items['qty'])); //如果物品数量为0，或非数字，则我们对购物车不做任何处理! if( ! is_numeric($items['qty']) OR $items['qty'] == 0) { if($this->debug === TRUE) { $this->_log("cart_items_data(qty)_invalid"); } return FALSE; } //物品ID正则判断 if( ! preg_match('/^['.$this->product_id_rule.']+$/i', $items['id'])) { if($this->debug === TRUE) { $this->_log("cart_items_data(id)_invalid"); } return FALSE; } //物品名称正则判断 if( ! preg_match('/^['.$this->product_name_rule.']+$/i', $items['name'])) { if($this->debug === TRUE) { $this->_log("cart_items_data(name)_invalid"); } return FALSE; } //去除物品单价左零及非数字（带小数点）字符 $items['price'] = trim(preg_replace('/([^0-9\.])/i', '', $items['price'])); $items['price'] = trim(preg_replace('/^([0]+)/i', '', $items['price'])); //如果物品单价非数字 if( ! is_numeric($items['price'])) { if($this->debug === TRUE) { $this->_log("cart_items_data(price)_invalid"); } return FALSE; } //生成物品的唯一id if(isset($items['options']) AND count($items['options']) >0) { $rowid = md5($items['id'].implode('', $items['options'])); } else { $rowid = md5($items['id']); } //加入物品到购物车 unset($this->_cart_contents[$rowid]); $this->_cart_contents[$rowid]['rowid'] = $rowid; foreach($items as $key => $val) { $this->_cart_contents[$rowid][$key] = $val; } return TRUE; } /** * 更新购物车物品信息（私有） * * @access private * @param array * @return bool */ private function _update($items = array()) { //输入物品参数异常 if( ! isset($items['rowid']) OR ! isset($items['qty']) OR ! isset($this->_cart_contents[$items['rowid']])) { if($this->debug == TRUE) { $this->_log("cart_items_data_invalid"); } return FALSE; } //去除物品数量左零及非数字字符 $items['qty'] = preg_replace('/([^0-9])/i', '', $items['qty']); $items['qty'] = preg_replace('/^([0]+)/i', '', $items['qty']); //如果物品数量非数字，对购物车不做任何处理! if( ! is_numeric($items['qty'])) { if($this->debug === TRUE) { $this->_log("cart_items_data(qty)_invalid"); } return FALSE; } //如果购物车物品数量与需要更新的物品数量一致，则不需要更新 if($this->_cart_contents[$items['rowid']]['qty'] == $items['qty']) { if($this->debug === TRUE) { $this->_log("cart_items_data(qty)_equal"); } return FALSE; } //如果需要更新的物品数量等于0，表示不需要这件物品，从购物车种清除 //否则修改购物车物品数量等于输入的物品数量 if($items['qty'] == 0) { unset($this->_cart_contents[$items['rowid']]); } else { $this->_cart_contents[$items['rowid']]['qty'] = $items['qty']; } return TRUE; } /** * 保存购物车数据到session * * @access private * @return bool */ private function _save_cart() { //首先清除购物车总物品种类及总金额 unset($this->_cart_contents['total_items']); unset($this->_cart_contents['cart_total']); //然后遍历数组统计物品种类及总金额 $total = 0; foreach($this->_cart_contents as $key => $val) { if( ! is_array($val) OR ! isset($val['price']) OR ! isset($val['qty'])) { continue; } $total += ($val['price'] * $val['qty']); //每种物品的总金额 $this->_cart_contents[$key]['subtotal'] = ($val['price'] * $val['qty']); } //设置购物车总物品种类及总金额 $this->_cart_contents['total_items'] = count($this->_cart_contents); $this->_cart_contents['cart_total'] = $total; //如果购物车的元素个数少于等于2，说明购物车为空 if(count($this->_cart_contents) <= 2) { unset($_SESSION['cart_contents']); return FALSE; } //保存购物车数据到session $_SESSION['cart_contents'] = $this->_cart_contents; return TRUE; } /** * 日志记录 * * @access private * @param string * @return bool */ private function _log($msg) { return @file_put_contents('cart_err.log', $msg, FILE_APPEND); } } /*End of file cart.php*/ /*Location /htdocs/cart.php*/ cart_demo.php文件如下：  array( 'id' => 'sp001', 'qty' => 20, 'price' => '10.50', 'name' => 'a002', 'options' => array( 'made' => 'china', 'company' => 'bgi' ) ), 1 => array( 'id' => 'sp002', 'qty' => 1, 'price' => '3.50', 'name' => 'b002' ) ); $arr = array( 'rowid' => '86dbb7cb58a667558b4bbb1f60330028', 'qty' => 21 ); $cart = new Cart(); $cart->insert($items); //var_dump($cart->contents()); $cart->update($arr); var_dump($cart->contents()); //$cart->destroy(); //var_dump($_SESSION['cart_contents']); /*end of php*/ 希望本文所述对大家的php程序设计有所帮助。