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
rush:PHP;">
_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*/
rush:PHP;">
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。
