使用PHP $ _Session和NO SQL创建一页购物车

本文介绍了使用PHP $ _Session和NO SQL创建一页购物车的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述我正在学习一些PHP，并且正在尝试创建一个所有页面的购物车。我已经阅读并可以看到SQL基础系统的好处，但是我想首先学习基础知识。为此，我创建了一个多页的页面，其中包含关联数组中的产品以及提交给自己的表单。我想要的要实现的目标是：只能购买一次产品（购买按钮替换为删除按钮）该项目及其成本将添加到下面的购物车中用户可以将其从购物车中删除，也可以将其从项目列表中删除总费用应根据要求进行更新。结帐按钮将提交商品名称和费用表格会自行发布，但不会需要任何SQL 我当前的问题是：我一次不能购买多个物品，即购物车仅包含最后购买的物品如果已购买了一件物品，是否购买了物品，我无法让它检查因此，将购买替换为删除我无法在购物车中显示商品详情 eckout按钮不会将任何详细信息传递给我的测试再次，我还没有在寻找SQL解决方案，只是使用了纯PHP $ _ SESSION 和 $ _ POST ，并希望使用按钮而不是< a href add ？> 类型的链接。感谢您冗长的阅读，代码如下： <？php session_start（）; $ items =数组（'A123'=>数组（'name'=>'Item1'，'desc'=>'项目1描述...'，'价格'=> 1000 ），'B456'=>数组（'name'=>'Item40' ，'desc'=>'Item40 description ...'，'price'=> 2500 ），'Z999'=>数组（'name'=>'Item999'，'desc'=>'Item999 description ...'，'price'=> 9999 ））; if（！isset（$ _SESSION ['cart']））{ $ _SESSION ['cart'] = array（）; } //如果（isset（$ _POST [ buy]））{ $ _SESSION ['cart'] = $ _POST; } //删除项目 else if（isset（$ _POST ['delete']））{//单击删除按钮未设置（ $ _POST ['delete']）; // } //空购物车 else if（isset（$ _POST [ delete]]））{//从购物车中删除项目unset（ $ _SESSION ['cart']）; } ？> < form action ='<？php echo $ _SERVER ['PHP_SELF']; ？>'method ='post'> <？php foreach（$ items as $ ino => $ item）{ $ title = $ item ['name']; $ desc = $ item [’desc’]; $ price = $ item ['price']; echo< p> $ title< / p>; echo< p> $ desc< / p>; echo< p> \ $$ price< / p>; if（$ _SESSION ['cart'] == $ ino）{ echo’< img src = carticon.png>’; echo< p>< button type ='submit'name ='delete'value ='$ ino'> Remove< / button>< / p>; }否则{ echo< button type ='submit'name ='buy'value ='$ ino'> Buy< / button>; } } ？> < / form> <？php if（isset（$ _SESSION [ cart]））{？> < form action ='（省略的链接）' target ='_ blank'method ='post' enctype ='application / x-www-form-urlencoded' > < table> < tr> < th> / th; < Price< / th> < th< / th; < / tr> <？php $ total = 0; foreach（$ _SESSION [ cart] as $ i）{？> < tr> < td> <？php echo（$ _ SESSION [ cart]）; ？> <！-商品名称-> < / td> < td> price<？php echo（$ _ SESSION [ price] [$ i]）; ？> <！-商品费用-> < / td> < td><按钮类型='提交'名称='删除'值='$ ino'>删除< / button> < / p>< / td> < / tr> <？php $ total = + $ _SESSION [ amounts] [$ i]; } $ _SESSION [ total] = $ total；？> < tr> < td colspan = 2>总计：$<？php echo（$ total）; && lt; / td> < td><输入类型=提交 value =结帐 />< / td> < / tr> < tr> < td>< button type ='submit'name ='clear'>清除购物车< / button>< / td> < / tr> < / table> < / form> <？php}？> 解决方案您的脚本中需要解决一些问题，因此，我将它们分解为各个部分。代码中也有很多安全错误检查，但作为纯粹的学习活动，我绕过了这些因素。定义购物车您将购物车定义为数组： if（！isset（$ _SESSION ['cart']））{ $ _SESSION ['cart' ] =数组（）; } 但是，当您在购物车中添加商品时， >替换购物车： //添加 if（isset（$ _POST [ buy ]））{{ $ _SESSION ['cart'] = $ _POST; // } 要添加一个项目到购物车，则应该使用 $ cart [] = $ _POST ，但是，还需要考虑其他因素。添加到购物车 $ cart [] = $ _POST 添加完整的当您只需要产品ID时，会将$ _POST 数据添加到购物车。正确的方法是： //如果（isset（$ _POST [ buy]）），则添加 { //检查商品是否尚未在购物车中，如果（！in_array（$ _ POST [ buy]，$ _SESSION ['cart']））{ //添加新商品放入购物车 $ _SESSION ['购物车] [] = $ _POST [购买]; } } 这将导致购物车存储多个值。例如， print_r（$ _ SESSION ['cart']）可能显示： array（ 0 =>'A123'， 1 =>'B456'）; 此数组中的每个项目都是已添加到购物车中的项目。从购物车中删除商品现在， $ _ SESSION ['cart']的结构已更改，从购物车中删除操作也需要更新。使用小的代码段，我们可以检查值是否存在于数组中，找到其键并将其删除。 //删除项目 else if（isset（$ _POST ['delete']））{// a //单击删除按钮 //如果（false！== $ key = array_search（$ _ POST ['delete']，$ _SESSION ['cart']））{ 未设置（$ _SESSION ['cart'] [$ key]）； } } 检查商品是否在购物车中需要进一步更改代码才能支持新的数组结构。您可以使用 in_array 检查购物车数组中是否包含您的产品。 <？php foreach （$ items as $ ino => $ item）{ // ...简洁起见 //通过检查商品是否存在于购物车中来检查商品是否存在ID： if（in_array（$ ino，$ _SESSION ['cart']））{// $ ino对您的第一个产品来说是'a123' echo< p>< button type ='submit'name ='delete'value ='$ ino'> Remove< / button>< / p>; }否则{ echo< button type ='submit'name ='buy'value ='$ ino'> Buy< / button>; } } ？> 简化代码在上面代码，我删除了一些代码。您正在执行以下操作： $ title = $ item [’name’]; $ desc = $ item [’desc’]; $ price = $ item ['price']; echo< p> $ title< / p>; echo< p> $ desc< / p>; echo< p> \ $$ price< / p>; 这可以简化为： echo< p> $ item ['name']< / p>; echo< p> $ item [’desc']< / p>; echo< p> \ $$ item [’price']< / p>; 而不是将 $$ 的两倍最后一行，我个人将使用： echo'< p> $'。 number_format（$ item [’name’]）。 ‘< / p>’；这使您可以更轻松地格式化数字的显示。或者，您可以使用 money_format 。显示购物车此代码存在一些问题。您正尝试将无法正常工作。您不能 echo 一个数组您正在使用 foreach（$ _SESSION [ cart]]作为$ i）尝试使用<？php echo（$ _ SESSION [ price] [$ i]）显示值时不正确；？> 您正在使用于 $ total 值的代码复杂化由于将随机< / p> 放入组合中正确的显示方式是： <？php //设置默认的总计 $ total = 0; foreach（$ _SESSION ['cart'] as $ ino）{？> < tr> < td> 名称：<？php echo $ items [$ ino] [’name’]; ？> < / td> < td> 价格：<？php echo $ items [$ ino] [ price]; ？> < / td> < td> < button type ='提交'name ='delete'value ='<？php echo $ ino; ？>’>删除< / button> < / td> < / tr> <？php $ total + = $ items [$ ino] [’price’]; } //结束foreach 吗？总计：$<？php echo $ total; ？> I am learning some PHP and I am trying to create a all in one page shopping cart. I have read into and can see the benefits of a SQL bases system, but I want to learn the basics first. In doing so I have create a all-in-one page that contains the products in an associated array, as well as a form that submits to itself.What I want to achieve is:A product can only be purchased once (buy button replaced with a remove button)The item and its cost are added to the cart belowA user can either remove it from the cart, or the item listThe total cost should be updated as required.The "checkout" button will submit item name and costThe form posts to itself and does not require any SQLMy current problem is:I cannot purchase more than one item at a time, i.e. the cart only contains the last purchased itemI cannot get it to "check" if an item has been purchased and if so, replace the "buy" with "remove"I cannot display the item details in the cartThe checkout button does not pass any details to my test Again, I am not looking for a SQL solution yet, just a pure PHP using $_SESSION and $_POST and would like to use buttons instead of <a href add?> type links.Thanks for the lengthy read in advance here is the code:<?phpsession_start ();$items = array ( 'A123' => array ( 'name' => 'Item1', 'desc' => 'Item 1 description...', 'price' => 1000 ), 'B456' => array ( 'name' => 'Item40', 'desc' => 'Item40 description...', 'price' => 2500 ), 'Z999' => array ( 'name' => 'Item999', 'desc' => 'Item999 description...', 'price' => 9999 ) );if (! isset ( $_SESSION ['cart'] )) { $_SESSION ['cart'] = array ();}// Addif (isset ( $_POST ["buy"] )) { $_SESSION ['cart'] = $_POST;} // Delete Itemelse if (isset ( $_POST ['delete'] )) { // a remove button has been clicked unset ( $_POST ['delete'] ); //} // Empty Cartelse if (isset ( $_POST ["delete"] )) { // remove item from cart unset ( $_SESSION ['cart'] );}?><form action='<?php echo $_SERVER['PHP_SELF']; ?>' method='post'> <?php foreach ( $items as $ino => $item ) { $title = $item ['name']; $desc = $item ['desc']; $price = $item ['price']; echo " <p>$title</p>"; echo " <p>$desc</p>"; echo "<p>\$$price</p>"; if ($_SESSION ['cart'] == $ino) { echo '<img src="carticon.png">'; echo "<p><button type='submit' name='delete' value='$ino'>Remove</button></p>"; } else { echo "<button type='submit' name='buy' value='$ino'>Buy</button> "; } } ?></form><?phpif (isset ( $_SESSION ["cart"] )) { ?><form action='(omitted link)'target='_blank' method='post'enctype='application/x-www-form-urlencoded'><table> <tr> <th>Product</th> <th>Price</th> <th>Action</th> </tr> <?php $total = 0; foreach ( $_SESSION ["cart"] as $i ) { ?> <tr> <td> <?php echo($_SESSION["cart"]); ?>  </td> <td>price<?php echo($_SESSION["price"][$i] ); ?>  </td> <td><button type='submit' name='delete' value='$ino'>Remove</button> </p></td> </tr> <?php $total = + $_SESSION ["amounts"] [$i]; } $_SESSION ["total"] = $total; ?> <tr> <td colspan="2">Total: $<?php echo($total); ?></td> <td><input type='submit' value='Checkout' /></td> </tr> <tr> <td><button type='submit' name='clear'>Clear cart</button></td> </tr></table></form><?php } ?> 解决方案 There's a few things that need fixing in your script, so I'll break them down into their individual parts.There's a lot of security error checks that should also be done with the code, but as a pure learning exercise, I'm bypassing those factors.Defining the cartYou're defining the shopping cart as an array:if (! isset ( $_SESSION ['cart'] )) { $_SESSION ['cart'] = array ();}However, when you add an item to the cart, you're replacing the cart:// Addif (isset ( $_POST ["buy"] )) { $_SESSION ['cart'] = $_POST; // } To add an item to the cart, you should be using $cart[] = $_POST, but, there are additional things to take into account.Adding to cartThe $cart[] = $_POST adds the full $_POST data to the cart, when you only need the product ID. The correct way would be:// Addif (isset ( $_POST ["buy"] )) { // Check the item is not already in the cart if (!in_array($_POST ["buy"], $_SESSION['cart'])) { // Add new item to cart $_SESSION ['cart'][] = $_POST["buy"]; }}This would result in the cart storing multiple values. For example, a print_r($_SESSION['cart']) might show:array ( 0 => 'A123', 1 => 'B456');Each item in this array would be an item that has been added to your cart.Removing an item from your cartNow that the structure of $_SESSION['cart'] has been changed, the "remove from cart" action requires updates too. Using a little snippet of code, we can check if the value exists in the array, find its key, and remove it.// Delete Itemelse if (isset ( $_POST ['delete'] )) { // a remove button has been clicked // Remove the item from the cart if (false !== $key = array_search($_POST['delete'], $_SESSION['cart'])) { unset($_SESSION['cart'][$key]); }}Check if the item is in your cartFurther changes to your code would be required to support the new array structure. You can use in_array to check if your product is contained in the cart array.<?php foreach ( $items as $ino => $item ) { // ... snipped for brevity // Check if an item is in the cart by checking for the existence of its ID: if (in_array($ino, $_SESSION['cart'])) { // The $ino would be 'a123' for your first product echo "<p><button type='submit' name='delete' value='$ino'>Remove</button></p>"; } else { echo "<button type='submit' name='buy' value='$ino'>Buy</button> "; } }?>Simplifying your codeIn the above code, I've removed some of the code. You are doing the following:$title = $item ['name'];$desc = $item ['desc'];$price = $item ['price'];echo " <p>$title</p>";echo " <p>$desc</p>";echo "<p>\$$price</p>";This can be simplified to:echo "<p>$item['name']</p>";echo "<p>$item['desc']</p>";echo "<p>\$$item['price']</p>";Rather than the double $$ in the last line, I personally would use:echo '<p>$' . number_format($item['name']) . '</p>';This allows you to format the display of the number easier. Alternatively, you could use money_format.Displaying the shopping cartThere are a few problems with this code.You're attempting to echo($_SESSION['cart']) which won't work. You cannot echo an arrayYou're using foreach ($_SESSION ["cart"] as $i) incorrectly when attempting to display the values using <?php echo($_SESSION["price"][$i] ); ?>You're complicating the code used for the $total valueThe HTML isn't valid due to a random </p> thrown into the mixThe correct way to display this would be:<?php// Set a default total$total = 0;foreach ( $_SESSION['cart'] as $ino ) { ?><tr> <td> Name: <?php echo $items[$ino]['name']; ?> </td> <td> Price: <?php echo $items[$ino]["price"]; ?> </td> <td> <button type='submit' name='delete' value='<?php echo $ino; ?>'>Remove</button> </td></tr><?php $total += $items[$ino]['price'];} // end foreach?>Total: $<?php echo $total; ?> 这篇关于使用PHP $ _Session和NO SQL创建一页购物车的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！