How to implement shopping cart in php using session

php uses session to implement the shopping cart method: first create the front-end code to implement the action of adding to the shopping cart; then implement the logical judgment of the shopping cart data in the PHP file; then load the list according to the data; and finally implement it through functions such as unset Just delete the product or calculate the amount.

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PHP uses session to achieve the shopping cart effect (click the button to add data, generate a list based on the data, delete the selected product, and calculate the amount when the button is clicked)

Effect Chart

There is a lot of code, intercept a part

Add to shopping cart (click the button to add session data)

##

    // 加入购物车
    function addshopping() {
      <?php
      $db = db($_GET[&#39;db&#39;]);
      $id = $formatData[&#39;id&#39;];
      $user = $formatData[&#39;user&#39;];
      // 当购物车没有时，即没有session数据时
      if (empty($_SESSION[&#39;gwc&#39;])) {
        $arr = array(array(&#39;user&#39; => $user, &#39;db&#39; => $db, &#39;id&#39; => $id, &#39;num&#39; => 1));
        $_SESSION[&#39;gwc&#39;] = $arr;
      } else {
        // 当购物车有数据时
        $arr = $_SESSION["gwc"];
        $order = false;
        foreach ($arr as $key => $value) {
          // 如果数据中有了这个数据
          if ($value[&#39;user&#39;] == $user && $value[&#39;db&#39;] == $db && $value[&#39;id&#39;] == $id) {
            $index = $key;  //保存这个相同数据的下标，以便操作
            $order = true;	
            //定义一个变量，看是佛有相同的数据，需要注意的是，不能再这个if语句中else，否则后面的语句
            //虽然会使数量加一，但是还是会多创建一条数据，为什么，自己想想就能明白，只是当时当局者迷
          }
        }
        if ($order) {
          // 如果该商品在购物车存在，让数量加1
          $arr[$index][&#39;num&#39;]++;
        } else {
          // 如果该商品购物车里面不存在，造一个一维数组扔到二维里面
          $arr[] = array(&#39;user&#39; => $user, &#39;db&#39; => $db, &#39;id&#39; => $id, &#39;num&#39; => 1);
        }
        $_SESSION["gwc"] = $arr;
      }

      ?>
      console.log(&#39;addshopping&#39;);
    }

Load the list according to the data

    <!-- 购物车列表 -->
    <?php
    foreach ($_SESSION[&#39;gwc&#39;] as  $dataList) {
        $clean = array();
        $clean[&#39;user&#39;] = $dataList[&#39;user&#39;];
        $clean[&#39;db&#39;] = $dataList[&#39;db&#39;];
        $clean[&#39;id&#39;] = $dataList[&#39;id&#39;];
        $clean[&#39;num&#39;] = $dataList[&#39;num&#39;];

        $res = $conn->fetchRow("SELECT * FROM {$clean[&#39;db&#39;]}  WHERE id={$clean[&#39;id&#39;]}");
        $clean[&#39;title&#39;] = $res[&#39;title&#39;];
        $clean[&#39;price&#39;] = $res[&#39;price&#39;];
        $clean[&#39;face&#39;]  = $res[&#39;face&#39;];

    ?>
        <p class="weui-content">
            <p class="weui-panel weui-panel_access">

                <p class="weui-panel__hd"><span><?php echo  $clean[&#39;user&#39;]; ?> </span><a href="javascript:void(0)" class="wy-dele"><!-- 删除 --></a></p>

                <p class="weui-panel__bd">
                    <p class="weui-media-box_appmsg pd-10">
                        <p class="weui-media-box__hd check-w weui-cells_checkbox">
                            <label class="weui-check__label" for="cart-<?php echo $clean[&#39;db&#39;] . &#39;-&#39; . $clean[&#39;id&#39;] ?>">
                     
                                <p class="weui-cell__hd cat-check">
                                    <input type="checkbox" class="weui-check" name="cartpro" id="cart-<?php echo $clean[&#39;db&#39;] . &#39;-&#39; . $clean[&#39;id&#39;] ?>"><i class="weui-icon-checked"></i>
                                </p>
                            </label>
                        </p>
                        <p class="weui-media-box__hd"><a href="pro_info.php?db=<?php echo  $clean[&#39;db&#39;]; ?>&id=<?php echo  $clean[&#39;id&#39;]; ?>"><img  class="weui-media-box__thumb" src="<?php echo  $clean[&#39;face&#39;];  ? alt="How to implement shopping cart in php using session" >" alt=""   style="max-width:90%"></a></p>
                        <p class="weui-media-box__bd">
                            <h1 class="weui-media-box__desc"><a href="pro_info.php?db=<?php echo  $clean[&#39;db&#39;]; ?>&id=<?php echo  $clean[&#39;id&#39;]; ?>" class="ord-pro-link"><?php echo  $clean[&#39;title&#39;];  ?></a></h1>
                            <p class="weui-media-box__desc">规格：<span>红色</span>，<span>23</span></p>
                            <p class="clear mg-t-10">
                                <p class="wy-pro-pri fl">¥<em class="num font-15 price"><?php echo  $clean[&#39;price&#39;];  ?></em></p>
                                <p class="pro-amount fr">
                                    <!-- 购买的数量 -->
                                    <input type="hidden" name="" class="datanum" value="<?php echo  $clean[&#39;num&#39;]; ?>">
                                    <!-- 提交删除的数据 -->
                                    <input type="hidden" name="" class="rmdata" value="shopping.php?db=<?php echo  $clean[&#39;db&#39;]; ?>&id=<?php echo  $clean[&#39;id&#39;];?>">
                                    <p class="Spinner"></p>
                                </p>
                            </p>
                        </p>
                    </p>
                </p>


            </p>
        </p>
    <?php }
    ?>

Delete the selected product

// echo &#39;<pre class="brush:php;toolbar:false">&#39;;// print_r($_SESSION[&#39;gwc&#39;]);// echo &#39;

';if(isset($_GET['db']) && isset($_GET['id'])){     $dataArr = $_SESSION['gwc'];     foreach ($dataArr as $key => $value) {         if($value['db'] == $_GET['db'] && $value['id'] == $_GET['id']){             unset($dataArr[$key]);         }     }     $_SESSION['gwc'] = $dataArr;     header("Location:shopping.php");}// echo '

';// print_r( $dataArr);// echo '

';

Amount calculation

    <!-- 金额计算 -->
    <script>
        window.onload = function() {
            var cartproAll = document.querySelectorAll(&#39;input[name=cartpro]&#39;);	
            var datanum = document.querySelectorAll(&#39;.datanum&#39;);   
            var numAll = document.querySelectorAll(&#39;.Amount&#39;);
            var DisDe  = document.querySelectorAll(&#39;.DisDe&#39;);
            var Increase  = document.querySelectorAll(&#39;.Increase&#39;);

            //  购买数量的多少
            numAll.forEach((item,i) => {
                item.value = datanum[i].value;
            })

            // 点击加号
            DisDe.forEach((item, i) => {
                item.onclick = function() {
                    computedPrice();
                }
            })
            // 点击减号
            Increase.forEach((item, i) => {
                item.onclick = function() {
                    computedPrice();
                }
            })
            // 点击单选时计算金额
            cartproAll.forEach((item, i) => {
                item.onclick = function() {
                    computedPrice();
                }
            })
        }
        function computedPrice(){
            var cartproAll = document.querySelectorAll(&#39;input[name=cartpro]&#39;);      //获取是否点击
            var price = document.querySelectorAll(&#39;.price&#39;);                        //价钱
            var price_total = document.querySelector(&#39;.price_total&#39;);               //价钱总数   
            var numAll = document.querySelectorAll(&#39;.Amount&#39;);                      //数量
            var total = 0;
            price_total.innerHTML = 0;
            cartproAll.forEach((item, i) => {
                if (item.checked == true) {
                        total += parseFloat(price[i].innerHTML) * parseFloat(numAll[i].value);
                    }
            })
            price_total.innerHTML = total;
        }
    </script>

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