PHP实现的购物车类实例

<?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_suess");
  }
 }
 /
   将物品加入购物车
  
   @aess 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
  
   @aess 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
  
   @aess 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）
  
   @aess 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
   
   @aess private
   @return bool
  /
 private function _save_cart() {
  //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
  
   @aess 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/

<?php
session_start();
require_once('cart.php');
$items = array(
   0 => array(
   'id' => 'sp001',
   'qty' => 20,
   'price' => '10.50',
   'name' => 'a002',
   'options' => array(
       'made' => 'china',
       'pany' => '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/