我的购物车类，支持自定义列及自动金额计算

<?php

//购物车类

//支持自定义列名及列数

// 作者：天地小子 twt326@163.com

//转载或修改请保留原版权，谢谢

class twt_Cart

{

//类属性*************************************************************

var $sp_count;//商品类数

var $sp_sumgold;//商品总金额

var $fields;//自定义列

var $f_num;//自定义列数

var $f_key;//作为判断商品是否重复的关键字

var $f_goldkey;//商品金额字段名用于商品统计信息计算时用

var $f_numkey;//商品数量字段名用于商品统计信息计算时用

var $cart;

//构造函数

function twt_Cart()

{

//从SESSION中读出一些必须参数

session_start();

if (! session_is_registered("mycart")) session_register("mycart");

$mycart=$_SESSION["mycart"];

$this->sp_count=count($mycart);

if (! session_is_registered("mc_fields")) session_register("mc_fields");

$this->fields=$_SESSION["mc_fields"];

$this->f_num=count($this->fields)-1;

if (! session_is_registered("mc_key")) session_register("mc_key");

$this->f_key=$_SESSION["mc_key"];

if (! session_is_registered("mc_goldkey")) session_register("mc_goldkey");

$this->f_goldkey=$_SESSION["mc_goldkey"];

if (! session_is_registered("mc_numkey")) session_register("mc_numkey");

$this->f_numkey=$_SESSION["mc_numkey"];

$this->cart=$mycart;

$this->updatecart();

}

//类方法***************************************************************

//更新总金额

function updatecart()

{

session_start();

if (! session_is_registered("mycart")) return false;

$mycart=$_SESSION["mycart"];

$tmp=0;

for ($i=0;$i<$this->sp_count;$i++)

$tmp+=$mycart[$i][$this->f_goldkey]*$mycart[$i][$this->f_numkey];

$this->sp_sumgold=$tmp;

}

//设置自定义字段及初始化类数组参数，以0开头

function setfield($tfield)

{

if (is_array($tfield))

{

$this->fields=$tfield;

//初始化一些值

$this->f_num=count($tfield)-1;

$this->f_key=$tfield[0];

$this->f_goldkey=$tfield[0];

$this->f_numkey=$tfield[0];

session_start();

$_SESSION["mc_fields"]=$tfield;

$_SESSION["mc_key"]=$tfield[0];

$_SESSION["mc_goldkey"]=$tfield[0];

$_SESSION["mc_numkey"]=$tfield[0];

}

else

return "参数传输错误，请传入从0开始下标的数组！";

}//setfield end

//设置关键字

function setkey($key,$numkey,$goldkey)

{

$this->f_key=$key;

$this->f_goldkey=$goldkey;

$this->f_numkey=$numkey;

session_start();

$_SESSION["mc_key"]=$key;

$_SESSION["mc_goldkey"]=$goldkey;

$_SESSION["mc_numkey"]=$numkey;

}

//清除购物篮

function clear()

{

$mycart=$_SESSION["mycart"];

unset ($mycart);

$_SESSION["mycart"]=$mycart;

session_unregister("mycart");

session_unregister("mc_fields");

session_unregister("mc_key");

session_unregister("mc_goldkey");

session_unregister("mc_numkey");

$this->cart=$mycart;

$this->sp_count=0;

$this->sp_sumgold=0;

}

//功能方法/////////////////////////////////////////////////////////

//添加商品数组参数，以自定义的字段名这下标

function addone($splist)

{

if ((! is_array($splist)) || ((count($splist)-1) != $this->f_num))

return "参数传输错误，请传入以自定义字段名为下标且元数个数吻合的数组！";

session_start();

$mycart=$_SESSION["mycart"];

//判断商品是否已经存在，如果存在，则加上

$tflag=true;

for ($i=0;$i<$this->sp_count;$i++)

{

if ($mycart[$i][$this->f_key]==$splist[$this->f_key])

{

$tflag=false;

//增加商品个数

$mycart[$i][$this->f_numkey]+=$splist[$this->f_numkey];

$i=$this->sp_count;

}

//添加商品到列表中

if ($tflag)

{

for ($i=0;$i<=$this->f_num;$i++)

{

$mycart[$this->sp_count][$this->fields[$i]]=$splist[$this->fields[$i]];

}

$this->sp_count+=1;

}

$this->cart=$mycart;

$_SESSION["mycart"]=$mycart;

$this->updatecart();

}//add end

//删除一个商品

function delone($id)

{

session_start();

$mycart = $_SESSION["mycart"] ;

for ($i=$id;$i<$this->sp_count-1;$i++)

{

for ($j=0;$j<=$this->f_num;$j++)

$mycart[$i][$this->fields[$j]]=$mycart[$i+1][$this->fields[$j]];

}

unset( $mycart[$this->sp_count-1] ) ;

$this->sp_count-=1;

$_SESSION["mycart"] = $mycart ;

$this->cart=$mycart;

$this->updatecart();

}//del end

//修改一件商品的数量

function modifyone($id,$num)

{

session_start();

$mycart = $_SESSION["mycart"] ;

if (! empty($mycart[$id][$this->f_key]))

$mycart[$id][$this->f_numkey]=$num;

$this->cart=$mycart;

$_SESSION["mycart"]=$mycart;

$this->updatecart();

}

//修改一件商品的单价

function modifyprice($id,$num)

{

session_start();

$mycart = $_SESSION["mycart"] ;

if (! empty($mycart[$id][$this->f_key]))

$mycart[$id][$this->f_goldkey]=$num;

$this->cart=$mycart;

$_SESSION["mycart"]=$mycart;

$this->updatecart();

}//modifyprice end

//某件商品加1

function add1($id)

{

session_start();

$mycart = $_SESSION["mycart"] ;

$mycart[$id][$this->f_numkey]+=1;

$this->cart=$mycart;

$_SESSION["mycart"]=$mycart;

$this->updatecart();

}

//某件商品减1

function del1($id)

{

session_start();

$mycart = $_SESSION["mycart"] ;

$mycart[$id][$this->f_numkey]-=1;

$this->cart=$mycart;

$_SESSION["mycart"]=$mycart;

$this->updatecart();

}

}//class end

下面是类的用法实例页面：

<?php

session_start();

include ("admin/config/twt_Cart.CLASS.php");

include ("admin/config/config.php");

include ("admin/config/function.php");

?><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>我的购物车</title>

</head>

<style>

table {

border: 0.5px solid;

}

.tbbb {

border: 0.5px solid #FFCCFF;

}

</style>

<!--

//函数名：fucCheckNUM

//功能介绍：检查是否为大于0数字

//参数说明：要检查的数字

//返回值：1为是数字，0为不是数字

function fucCheckNUM(NUM)

{

var i,j,k,strTemp;

strTemp="0123456789.";

if ( NUM.length== 0)

return false;

for (i=0;i<NUM.length;i++)

{

j=strTemp.indexOf(NUM.charAt(i));

if (j==-1)

{

//说明有字符不是数字

return false;

}

//检查小数点的个数

k=0;

strTemp=".";

for (i=0;i<NUM.length;i++)

{

j=strTemp.indexOf(NUM.charAt(i));

if (j != -1)

{

//是小数点

k+=1;

}

if (k>0) return false;

}

if (NUM<=0) return false;

//说明是数字

return true;

}

function checknum(num)

{

if (! fucCheckNUM(num))

{

document.frmspin.f_num.value=1;

alert("请输入大于0的下整数！");

return false;

}

function modifyid(id)

{

document.frmsplist.action="mycart.php?action=modify&id="+id;

document.frmsplist.submit();

}

//-->

</script>

<body>

$thiscart=new twt_Cart;

$field[0]="id";

$field[1]="name";

$field[2]="num";

$field[3]="gold";

$thiscart->setfield($field);

$thiscart->setkey("id","num","gold");

if ($_GET[action]=="incart")

{

$tlist["id"]=$_POST[f_id];

$tlist["name"]=$_POST[f_name];

$tlist["num"]=$_POST[f_num];

$tlist["gold"]=$_POST[f_gold];

$thiscart->addone($tlist);

}

if ($_GET[action]=="del")

{

$thiscart->delone($_GET[id]);

}

if ($_GET[action]=="modify")

{

$thiscart->modifyone($_GET[id],$_POST["t_num_$_GET[id]"]);

}

if ($_GET[action]=="clear")

{

$thiscart->clear();

}

if ($_GET[action]=="add1")

{

$thiscart->add1($_GET[id]);

}

if ($_GET[action]=="del1")

{

$thiscart->del1($_GET[id]);

}

if($_GET[action]=='indb')

{

if ($thiscart->sp_count==0)

{ $tmpstr="alert(\"没有定购任何商品！\");

window.close();";

echo getjavascript($tmpstr);

}

else

{

$sql[0]="delete from dglist where dgl_bjid=$_SESSION[wb_bjid]";

$sql[1]="delete from dinggou where dg_uid=$_SESSION[wb_id] and dg_jid=$_SESSION[wb_bjid]";

exesql($conf_db,$sql,$db,"清空旧的商品列表出错！","echo",true,"res");

//插入定购表

$sql="insert into dinggou set dg_uid=$_SESSION[wb_id],dg_jid=$_SESSION[wb_bjid]";

exesql($conf_db,$sql,$db,"提交定单出错！","echo",true,"res");

//插入商品

$sql=array();

for ($i=0;$i<$thiscart->sp_count;$i++)

{

$sql[$i]="insert into dglist set dgl_bjid=$_SESSION[wb_bjid],dgl_pid=".$thiscart->cart[$i]["id"].",dgl_num=".$thiscart->cart[$i]["num"];

// echo $sql[$i];

}

exesql($conf_db,$sql,$db,"提交商品订单出错！","popup",true,"res");

$thiscart->clear();

$tmpstr="alert(\"操作完成，购物车已经被清空！\");

window.open(\"http://".$_SESSION[wb_sip].":5026/dg|".rawurlencode($_SESSION[wb_bjno])."| \",\"订购商品\",\"width=500 height=300 revisable=no scrollbar=yes menubar=no status=no directions=no location=no toolbar=no\");

window.close();";

echo getjavascript($tmpstr);

}

<div align="center"><img src="image/cart/behav_01.gif" width="20" height="14"><font color="#33CCFF">我的购物车-->商品列表</font><br/>

</div>

<tr>

<tr>

</div></td>

</tr>

</table>

</div></td>

</tr>

<tr>

</tr>

<?php

for ($i=0;$i<$thiscart->sp_count;$i++)

{

?><tr>

<input type="text" name="textfield" value="<?php echo $thiscart->cart[$i]["name"]; ?>" readonly>

</div></td>

<input name="t_num_<?php echo $i; ?>" type="text" id="t_num_<?php echo $i; ?>" value="<?php echo $thiscart->cart[$i]["num"]; ?>" size=7>

</div></td>

</tr><?php

}

?><tr>

<td colspan="2"><div align="right"><?php echo $thiscart->sp_sumgold; ?>元

</div></td>

</tr>

</form>

</table>

<tr>

</tr>

</table>

<?php

if ($_GET[action]=="dgsp")

{

</div>

<tr>

品名:</div></td><?php

//从数据库中读出产品信息

$sql="select * from shangpin where sp_id=$_GET[cpid]";

$rst=exesql($conf_db,$sql,$db,"未找到商品!","popup","yes","rst");

<td width="141" rowspan="4" valign="middle"><div align="center"><img src="<?php

if (empty($rst[sp_img]))

echo $conf_fimgpath."defult.jpg";

else {

if ($rst[sp_imgflag]==1)

echo $conf_fimgpath.$_SESSION[wb_id]."/".$rst[sp_img];

else

echo $conf_fimgpath.$rst[sp_img];}

?>" width="120" height="120"></div></td>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</div></td>

</tr>

</form>

</table>

<?php } ?>

</body>

</html>