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正如标题上所说,我很确定我已经定义了它,顺便说一句,我是 PHP 新手,所以任何人都可以帮助我,而且我很抱歉有些变量是用 bahasa 写的,但这不是问题所以.. .

我尝试了堆栈溢出在处理类似问题时提供的所有方法,但没有任何效果。

<?php
// Check existence of id parameter before processing further
if(isset($_GET["id"]) && !empty(trim($_GET["id"]))){
    // Include config file
   include "koneksi.php";

    // Prepare a select statement
    $sql ="SELECT tabel_barang.nama_barang, tabel_stock.quantity
        FROM tabel_barang
        LEFT JOIN tabel_stock ON tabel_barang.tabel_barang id=tabel_stock.tabel_stock id
        ORDER BY tabel_barang.nama_barang";

    if($stmt = mysqli_prepare($db, $sql)){
        // Bind variables to the prepared statement as parameters
        mysqli_stmt_bind_param($stmt, "i", $param_id);

        // Set parameters
        $param_id = trim($_GET["id"]);

        // Attempt to execute the prepared statement
        if(mysqli_stmt_execute($stmt)){
            $result = mysqli_stmt_get_result($stmt);

            if(mysqli_num_rows($result) == 1){
                /* Fetch result row as an associative array. Since the result set contains only one row, we don't need to use while loop */
                $row = mysqli_fetch_array($result, MYSQLI_ASSOC);

                // Retrieve individual field value
                $nama_barang = $row["nama_barang"];
                $quantity = $row["quantity"];

            } else{ 
                // URL doesn't contain valid id parameter. Redirect to error page
                header("location: error.php");
                exit();
            }

        } else{
            echo "Terjadi kesalahan, silahkan coba lagi.";
        }


   // Close statement
    mysqli_stmt_close($stmt);

    // Close connection
    mysqli_close($db);

    } 

} else{
    // URL doesn't contain id parameter. Redirect to error page
    header("location: error.php");
    exit();
}
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Check Data</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
    <style type="text/css">
        .wrapper{
            width: 500px;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <div class="container-fluid">
            <div class="row">
                <div class="col-md-12">
                    <div class="page-header">
                        <h1>Check Data</h1>
                    </div>
                    <div class="form-group">
                        <label>Nama Barang</label>
                        <p class="form-control-static"><?php echo $row["nama_barang"]; ?></p>
                    </div>
                    <div class="form-group">
                        <label>Quantity</label>
                        <p class="form-control-static"><?php echo $row["quantity"]; ?></p>
                    </div>
                    <p><a href="stock.php" class="btn btn-primary">Kembali</a></p>
                </div>
            </div>        
        </div>
    </div>
</body>
</html>

我希望数据会显示出来,但它给了我这样的错误报告

注意:未定义变量:第 85 行 C:\xampp\htdocs\test\transaksi_toko\read_stock.php 中的行

还有这个

注意:未定义变量:第 89 行 C:\xampp\htdocs\test\transaksi_toko\read_stock.php 中的行

如果我的信息或代码没有提供足够的信息,我很抱歉,这是我第一次在这个平台上提问。

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