我正在构建一个简单的购物车，用户可以在其中选择披萨订单并从三种选择（小型，中型和大型）中进行选择。选择后，我希望将产品放入购物车并计算总数。我的代码只允许我接受小披萨
<form id="form1" name="form1" method="post" action="cart.php">
<label>Small - <?php echo $small_price; ?></label>
<input type="hidden" name="pid" id="pid" value="<?php echo $product_id; ?>" />
<input type="hidden" name="price" id="price" value="<?php echo $small_price; ?>" />
<input type="submit" name="button" id="button" value="Add" class="btn btn-default" />
</form>
<form id="form2" name="form2" method="post" action="cart.php">
<label>Medium - <?php echo $medium_price; ?></label>
<input type="hidden" name="pid2" id="pid2" value="<?php echo $product_id; ?>" />
<input type="hidden" name="medium_price" id="medium_price" value="<?php echo $medium_price; ?>" />
<input type="submit" name="button" id="button" value="Add" class="btn btn-default" />
</form>
if (isset($_POST['pid']) || isset($_POST['pid2'])) { //the id of the item being added to the cart
$pid = $_POST['pid'];
// $pid2 = $_POST['pid2'];
$wasFound = false;
$i = 0;
// If the cart session variable is not set or cart array is empty
if (!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"]) < 1) {
// run this code if the cart is empty or not set
$_SESSION["cart_array"] = array(0 => array("item_id" => $pid, "quantity" => 1));
} else {
// RUN IF THE CART HAS AT LEAST ONE ITEM IN IT
foreach ($_SESSION["cart_array"] as $each_item) {
$i++;
while (list($key, $value) = each($each_item)) {
if ($key == "item_id" && $value == $pid) {
// That item is in cart already so let's adjust its quantity using array_splice()
array_splice($_SESSION["cart_array"], $i-1, 1, array(array("item_id" => $pid, "quantity" => $each_item['quantity'] + 1)) );
$wasFound = true;
} // close if condition
} // close while loop
} // close foreach loop
if ($wasFound == false) {
array_push($_SESSION["cart_array"], array("item_id" => $pid, "quantity" => 1));
}
}
header("location: cart.php");
exit();
}
/**
* Section 2 (if user chooses to empty their shopping cart)
**/
if (isset($_GET['cmd']) && $_GET['cmd'] == "emptycart") {
unset($_SESSION["cart_array"]);
}
/***
* Section 3 (if user chooses to adjust item quantity)
***/
if (isset($_POST['item_to_adjust']) && $_POST['item_to_adjust'] != "") {
// execute some code
$item_to_adjust = $_POST['item_to_adjust'];
$quantity = $_POST['quantity'];
$quantity = preg_replace('#[^0-9]#i', '', $quantity); // filter everything but numbers
if ($quantity >= 100) { $quantity = 99; }
if ($quantity < 1) { $quantity = 1; }
if ($quantity == "") { $quantity = 1; }
$i = 0;
foreach ($_SESSION["cart_array"] as $each_item) {
$i++;
while (list($key, $value) = each($each_item)) {
if ($key == "item_id" && $value == $item_to_adjust) {
// That item is in cart already so let's adjust its quantity using array_splice()
array_splice($_SESSION["cart_array"], $i-1, 1, array(array("item_id" => $item_to_adjust, "quantity" => $quantity)));
} // close if condition
} // close while loop
} // close foreach loop
}
/*
* Section 5 (render the cart for the user to view on the page)
*/
$cartOutput = "";
$cartTotal = "";
$pp_checkout_btn = '';
$pid_array = '';
if (!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"]) < 1) {
$cartOutput = "<h2 align='center'>Your shopping cart is empty</h2>";
}
else { // Start PayPal Checkout Button
$pp_checkout_btn .= '<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="upload" value="1">
<input type="hidden" name="business" value="you@youremail.com">';
// Start the For Each loop
$i = 0;
foreach ($_SESSION["cart_array"] as $each_item) {
$item_id = $each_item['item_id'];
$sql = mysqli_query($conn, "SELECT * FROM product WHERE product_id='$item_id' LIMIT 1");
while ($row = mysqli_fetch_array($sql)) {
$pid = $row["product_id"];
$product_name = $row["product_name"];
$small_price = $row["small_price"];
$medium_price = $row["medium_price"];
$large_price = $row["large_price"];
$product_category = $row["product_category"];
$product_desc = $row["product_desc"];
}
$pricetotal = $small_price * $each_item['quantity'];
$cartTotal = $pricetotal + $cartTotal;
setlocale(LC_MONETARY, "en_JA");
$pricetotal = money_format("%10.2n", $pricetotal);
// Dynamic Checkout Btn Assembly
$x = $i + 1;
$pp_checkout_btn .= '<input type="hidden" name="item_name_' . $x . '" value="' . $product_name . '">
<input type="hidden" name="amount_' . $x . '" value="' . $small_price . '">
<input type="hidden" name="quantity_' . $x . '" value="' . $each_item['quantity'] . '"> ';
// Create the product array variable
$pid_array .= "$item_id-".$each_item['quantity'].",";
// Dynamic table row assembly
$cartOutput .= "<tr>";
$cartOutput .= '<td><a href="product.php?id=' . $item_id . '">' . $product_name . '</a><br /><img src="inventory_images/' . $product_name . '.jpg" alt="' . $product_name. '" width="40" height="52" border="1" /></td>';
$cartOutput .= '<td>' . $product_desc . '</td>';
/*if ($small_price ) {
$cartOutput .= '<td>$' . $small_price .'</td>';
}
else if ($medium_price ){
$cartOutput .= '<td>$' . $medium_price .'</td>';
}
*/
$cartOutput .= '<td>$' . $small_price .'</td>';
$cartOutput .= '<td><form action="cart.php" method="post">
<input name="quantity" type="text" value="' . $each_item['quantity'] . '" size="1" maxlength="2" />
<input name="adjustBtn' . $item_id . '" type="submit" value="change" class="btn btn-default"/>
<input name="item_to_adjust" type="hidden" value="' . $item_id . '" />
</form></td>';
//$cartOutput .= '<td>' . $each_item['quantity'] . '</td>';
$cartOutput .= '<td>' . $pricetotal . '</td>';
$cartOutput .= '<td><form action="cart.php" method="post"><input name="deleteBtn' . $item_id . '" type="submit" value="X" /><input name="index_to_remove" type="hidden" value="' . $i . '" /></form></td>';
$cartOutput .= '</tr>';
$i++;
}