PHP implements the shopping cart class that imitates CodeIgniter_php skills

The example in this article describes how to implement a shopping cart class that imitates CodeIgniter in PHP. Share it with everyone for your reference. The details are as follows:

Imitate CodeIgniter’s shopping cart class here

Basic shopping cart functions:

1) Add items to shopping cart
2) Delete items from shopping cart
3) Update shopping cart item information [1/-1]
4) Statistics of shopping cart items
1. Total Project
2. Total quantity
3. Total amount
5) Calculate the quantity and amount of shopping items
6) Clear shopping cart

The cart.php file is as follows:



<&#63;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 $_cart_contents = array();
 /**
  * 构造函数
  *
  * @param array
  */
 public function __construct() {
  //是否第一次使用&#63;
  if(isset($_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*/

cart_demo.php file is as follows:

&#65279;<&#63;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*/

I hope this article will be helpful to everyone’s PHP programming design.