php教程

超轻量级php框架startmvc

PHP实现的购物车类实例

更新时间:2020-03-04 22:11:17 作者:startmvc
本文实例讲述了PHP实现的购物车类。分享给大家供大家参考。具体分析如下:该购物车类是

本文实例讲述了PHP实现的购物车类。分享给大家供大家参考。具体分析如下:

该购物车类是基于CodeIgniter的购物车类仿写实现的。

购物车基本功能如下:

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

1. cart.php文件:


<?php
/**
 *
 * @author quanshuidingdang
 */
class Cart {
 //物品id及名称规则,调试信息控制
 private $product_id_rule = '\.a-z0-9-_'; //小写字母 | 数字 | ._-
 private $product_name_rule = '\.\:a-z0-9-_';//小写字母 | 数字 | ._-:
 private $debug = TRUE;
 //购物车
 private $_cart_contents = array();
 /**
 * 构造函数
 *
 * @param array
 */
 public function __construct() {
 //是否第一次使用?
 if(isset($_SESSION['cart_contents'])) {
 $this->_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*/

2. cart_demo.php文件如下:


<?php
session_start();
require_once('cart.php');
$items = array(
 0 => 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。

PHP 购物车类