Question

我之前问过这个问题，但没有得到任何实际答案。我为妻子的珠宝创建了一个网站。她想为自己制作的每种款式（手链，项链等）提供一个产品页面。

我创建了一个带有类别部分的数据库，该部分具有她创建的所有不同类别。我唯一的问题是我无法获取要显示在产品页面上的信息。我收到诸如

之类的错误

注意：未定义的变量：第83行的C：\ xampp \ htdocs \ pinkys_pearls \ bracelets.php中的item_number。

这是我的页面代码：

<?php 
    error_reporting(E_ALL);
    ini_set('display_startup_errors', 1);
    ini_set('display_errors', 1);
?>
<?php 
    // Connect to the MySQL database  
    include_once("storescripts/connect_to_mysql.php");
    $con = mysqli_connect("$db_host","$db_username","$db_pass","$db_name");
    if (mysqli_connect_errno()) {
        printf("Connect failed: %s\n", mysqli_connect_errno());
        exit();

        //Initializing variable
        $item_number = "item_number";
        $description = "description";
        $category = "category";
        $price = "price";
        $qty = "qty";

        $sql = "SELECT category FROM products WHERE category='Bracelets';";
        $result = mysqli_query($con, $sql);
        $resultCheck = mysqli_num_rows($result);
        if ($resultCheck > 0) {
            // get all the product details
            while($row = mysqli_fetch_assoc($result)); { 
                echo $item_number = $row["item_number"];
                $price = $row["price"];
                $desc = $row["description"];
                $category = $row["category"];
            }
        } 
        else {
            echo "Data to render this page is missing.";
            exit();
        }
    }
?>
<!DOCTYPE html>
<html>
<head>
    <title>Bracelets</title>
    <meta charset="utf-8">
    <meta http-equiv="x=UA-comparable" content="IE-edge">
    <meta name="description" content="Pinky's Pearls is a website where one of a kind jewelry designed by Nichole <q>Nicki</q> can be seen and purchased">
    <meta name="keywords" content="jewelry, beads, bracelets, rings, pendants, necklaces, pearls, crystal">
    <meta name="viewpoint" content="width=device-width, initial-scale=1">
    <meta name="author" content="samuel jaycox">
    <link href="style.css" rel="stylesheet">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
    <link rel="shortcut icon" type="image/png" href="pictures/pinky.png">
    <script src="https://use.fontawesome.com/0c9491c5b9.js"></script>
</head>
<body>
    <div align="center"  id="wrapper">
    <div id="banner-wrapper">
    <!---Company Header-->
    <header> 
        <div id="header">
            <img class="bracelet_header" src="pictures/headers/bracelets.jpg" alt="Bracelets">
            <audio autoplay="autoplay" loop="loop" id="background-music">
                <source src="music/Albinoni-adagio-in-g-minor-acoustic-guitar.mp3" type="audio/mpeg">
                <source src="music/Albinoni-adagio-in-g-minor-acoustic-guitar.wav" type="audio/wav">    
            </audio>
        </div>
    </header>
    <!---end of Company Header-->
    <br>
    <?php include_once("templates/template_navigation.php"); ?>     
    <br>
    <br>
    <br>
    <!--Start Comment page Body Content-->
    <div id="body-content">
        <div class="bracelet_body">
            <table width="100%" border="2" cellspacing="0" cellpadding="15">
                <tr>
                    <td width="19%" valign="top">
                        <img src="pictures/inventory/<?php echo $pid; ?>.png" width="142" height="188" alt="<?php echo $item_number; ?>" /><br />
                        <a href="pictures/inventory/<?php echo $pid; ?>.png">View Full Size Image</a>
                    </td>
                    <td width="81%" valign="top">
                        <h3><?php echo $item_number; ?></h3>
                        <p><?php echo "$".$price; ?>
                            <br /><br />
                            <?php echo $desc; ?>
                            <br />
                        </p>
                        <form  id="form1" name="form1" method="post" action="cart.php">
                            <input type="hidden" name="pid" id="pid" value="<?php echo $id; ?>" />
                            <input class="button" type="submit" name="button" id="button" value="Add to Shopping Cart" />
                        </form>
                    </td>
                </tr>
            </table>
        </div>
    </div>
    <!--end of Comment body-->
    <?php include_once("templates/template_footer.php"); ?>
</body>
</html>

该如何解决？

Answer 1

您在关键点缺少右花括号-

if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_errno());
    exit();

// RIGHT HERE 

    //Initializing variable
    $item_number = "item_number";
    $description = "description";
    $category = "category";

没有它，不会初始化任何变量，永远不会运行SQL查询，等等。

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尝试从数据库访问某些信息

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