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PHP实现的购物车类实例

2024-04-25 20:37:31
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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。

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