每一个，我都遇到小问题，希望有人帮助我。这是电子购物网站，我只是想要一点帮助。按添加到购物车链接后的想法会将他转入购物车页面，有两个链接编辑和删除，删除将删除该项目，这是有效的.但是当有人按编辑链接时，数量列中的文本框会出现保存链接，一旦他按保存，就会出现保存链接，数据库中会有更新
问题是：1-如何将文本框值从案例"显示更新"转移到另一个案例"保存"？我试图$qq=$_POST['qun'];并在操作和 id 旁边的保存链接中发送变量，但它并不总是有效，它说未定义的变量"qun">
第二个问题是：文本框和保存链接出现在购物车上的所有项目中，我不希望这样，我只想要我按旁边的编辑的项目，更改为文本框并保存链接将适用。
我知道我已经放了 while 循环，这只是为了确保在按链接编辑时项目的 ID 得到它 谁将获得文本框并保存链接
这是代码请帮助我，
switch($action){
case "add":
{$id=$_REQUEST['id'];
$query='insert into cart values("1",'.$id.',"1")';
$result=mysql_query($query);
header("location:cart.php?action=show");
break;
}
case "remove":
{ $id=$_REQUEST['id'];
echo $id;
$query='delete from cart where itemId='.$id.'' or die(mysql_error());
$result = mysql_query($query) or die(mysql_error());
header ("location:cart.php?action=show");
break;}
case "showupdate":
{ $id=$_REQUEST['id'];
$sql2="select * from cart";
$result2= mysql_query($sql2);
while($row2 = mysql_fetch_array($result2))
{ if ( $id == $row2['itemId'])
{ $totalCost =0;
$query = "select * from cart inner join items on cart.itemId = items.itemId";
$result = mysql_query($query);
?>
<table width="100%" border="1">
<?php while($row = mysql_fetch_array($result)){
$totalCost += ($row["qty"] * $row["itemPrice"]);
?>
<tr>
<td><img src="<?php echo $row["image"];?>" height="50" width="50"/></td>
<td><?php echo $row["itemName"]; ?></td>
<td>SR<?php echo $row["itemPrice"]; ?></td>
<td>
<form method="POST" name="form1">
<input type = "text" name="qun" value="<?php echo $row['qty'];?>" size="10"/>
</form>
</td>
<td><a href="cart.php?action=savee&id=<?php echo $row["itemId"]; ?>">Save</a></td>
<td><a href="cart.php?action=remove&id=<?php echo $row["itemId"]; ?>">Remove</a></td>
</tr>
<?php }
// Increment the total cost of all items
$totalCost += ($row["qty"] * $row["itemPrice"]);
$totalCost = $totalCost + ($row["qty"] * $row["itemPrice"]); ?>
<tr> <td colspan="2"> <a href="homestore.php">Keep Shopping</a></td>
<td colspan="2"> <b>Total: SR<?php echo $totalCost; ?></b></td></tr>
</table>
<?php }
} break;}
case "savee":
{ $id=$_REQUEST['id'];
$sql='update cart set qty='.$_POST['qun'].'where itemId='.$id.''or die(mysql_error());
$result=mysql_query($sql)or die(mysql_error());
header ("location:cart.php?action=show");
break;
}
case "show":
{
$totalCost =0;
$query = "select * from cart inner join items on cart.itemId = items.itemId";
$result = mysql_query($query);
?>
<table width="100%" border="1">
<?php while($row = mysql_fetch_array($result))
{
$totalCost += ($row["qty"] * $row["itemPrice"]);
?>
<tr>
<td><img src="<?php echo $row["image"];?>" height="50" width="50"/></td>
<td><?php echo $row["itemName"]; ?></td>
<td>SR<?php echo $row["itemPrice"]; ?></td>
<td><a href="cart.php?action=showupdate&id=<?php echo $row["itemId"]; ?>">edit</a></td>
<td><a href="cart.php?action=remove&id=<?php echo $row["itemId"]; ?>">Remove</a></td>
</tr>
<?php }
// Increment the total cost of all items
$totalCost += ($row["qty"] * $row["itemPrice"]);
$totalCost = $totalCost + ($row["qty"] * $row["itemPrice"]); ?>
<tr> <td colspan="2"> <a href="homestore.php">Keep Shopping</a></td>
<td colspan="2"> <b>Total: SR<?php echo $totalCost; ?></b></td></tr>
</table>
<?php break; }
}?>
如果我点击添加链接，它将转换 action="add" 和该项目的 id之后，它将插入到添加大小写中的切换语句，因为有标题("位置.."(，它将立即传输以显示向我们显示表格编辑 + 删除链接的情况，一旦单击编辑链接，它将转到显示更新案例，显示文本框 + 保存链接，单击保存后它将转到萨维案。
A.要始终使用$_POST['qun']，您需要将其保存在会话中，请参阅文档 http://php.net/manual/en/function.session-start.php
例
session_start();
$_SESSION['qun'] = $_POST['qun'] ;
// to get qun back
echo $_SESSION['qun'] ;
二.您的代码充满了SQL注入 尝试对所有发布的数据使用mysql_real_escape_string
$id = mysql_real_escape_string ( $_POST ['id'] );
C.抱歉，我可以为您编写整个class，但这是您如何使代码看起来多么干净的示例
include 'runner.class.php';
$runner = new Runner ( $action );
$runner->process ();
跑步者.class.php
class Runner {
private $action;
private $id;
private $qun;
function __construct($action) {
$this->action = $action;
$this->id = mysql_real_escape_string ( $_REQUEST ['id'] );
$this->qun = mysql_real_escape_string ( $_REQUEST ['id'] );
}
function process() {
switch ($this->action) {
case "add" :
$this->add ();
break;
case "remove" :
$this->remove ();
break;
case "savee" :
$this->save ();
break;
case "show" :
$this->show ();
break;
}
}
function add() {
$query = 'insert into cart values("1",' . $this->id . ',"1")';
$result = mysql_query ( $query );
header ( "Location: cart.php?action=show" );
}
function remove() {
$query = 'delete from cart where itemId=' . $this->id . '' or die ( mysql_error () );
$result = mysql_query ( $query ) or die ( mysql_error () );
header ( "Location: cart.php?action=show" );
}
function save() {
$_SESSION ['qun'] = mysql_real_escape_string ( $_POST ['qun'] ); // Save
// Quu
$sql = 'update cart set qty=' . $_POST ['qun'] . 'where itemId=' . $this->id . '' or die ( mysql_error () );
$result = mysql_query ( $sql ) or die ( mysql_error () );
header ( "Location: cart.php?action=show" );
break;
}
function showUpdate() {
$_SESSION ['qun'] = mysql_real_escape_string ( $_POST ['qun'] ); // Save Quu
// Add Code
}
function show() {
$qun = $_SESSION ['qun']; // Use Qui
// Add Code
}
}