ผมเขียนcode ขึ้น error Trying to access array offset on value of type bool in ของphp ต้องแก้ไงหรอครับ

กระทู้คำถาม

การพัฒนา Web Application การออกแบบฐานข้อมูล MySQL PHP

<?php
    session_start();
    require_once "connect.php";
    if (isset($_POST['update'])) {
        $id = $_POST['id'];
        $user_name = $_POST['user_name'];
        $email = $_POST['email'];
        $img = $_FILES['img'];
        $img2 = $_POST['img2'];
        $upload = $_FILES['img']['name'];
        if ($upload != '') {
            $allow = array('jpg', 'jpeg', 'png');
            $extension = explode('.', $img['name']);
            $fileActExt = strtolower(end($extension));
            $fileNew = rand() . "." . $fileActExt;  // rand function create the rand number
            $filePath = 'uploads/'.$fileNew;
            if (in_array($fileActExt, $allow)) {
                if ($img['size'] > 0 && $img['error'] == 0) {
                   move_uploaded_file($img['tmp_name'], $filePath);
                }
            }
        } else {
            $fileNew = $img2;
        }
        $sql = $pdo->prepare("UPDATE users SET user_name = :user_name, email = :email, img = :img WHERE id = :id");
        $sql->bindParam(":id", $id);
        $sql->bindParam(":user_name", $user_name);
        $sql->bindParam(":email", $email);
        $sql->bindParam(":img", $fileNew);
        $sql->execute();
        if ($sql) {
            $_SESSION['success'] = "Data has been updated successfully";
            header("location: E.php");
        } else {
            $_SESSION['error'] = "Data has not been updated successfully";
            header("location: E.php");
        }
    }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Edit Data</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
    <style>
        .container {
            max-width: 550px;
        }
    </style>
</head>
<body>
    <div class="container mt-5">
        <h1>Edit Data</h1>
        <hr>
        <form action="E.php" method="post" enctype="multipart/form-data">
            <?php


                if (isset($_GET['id'])) {
                        $id = $_GET['id'];
                        $stmt = $pdo->prepare("SELECT * FROM users WHERE id = '$id'");
                        $stmt->execute();
                        $data = $stmt->fetch();
            }
            ?>
                <div class="mb-3">
                    <label for="id" class="col-form-label">ID:</label>
                    <input type="text" readonly value="<?php echo $data['id']; ?>" required class="form-control" name="id" >
                    <label for="user_name" class="col-form-label">Name:</label>
                    <input type="text" value="<?php echo $data['user_name']; ?>" required class="form-control" name="user_name" >
                    <input type="hidden" value="<?php echo $data['img']; ?>" required class="form-control" name="img2" >
                </div>
                <div class="mb-3">
                    <label for="user_name" class="col-form-label">Email</label>
                    <input type="text" value="<?php echo $data['email']; ?>" required class="form-control" name="email">
                </div>
                <div class="mb-3">
                    <label for="user_name" class="col-form-label">Position:</label>
                    <input type="text" value="<?php echo $data['position']; ?>" required class="form-control" name="position">
                </div>
                <div class="mb-3">
                    <label for="img" class="col-form-label">Image:</label>
                    <input type="file" class="form-control" id="imgInput" name="img">
                    <img width="100%" src="uploads/<?php echo $data['img']; ?>" id="previewImg" alt="">
                </div>
                <hr>
                <a href="E.php" class="btn btn-secondary">Go Back</a>
                <button type="submit" name="update" class="btn btn-primary">Update</button>
            </form>
    </div>
    <script>
        let imgInput = document.getElementById('imgInput');
        let previewImg = document.getElementById('previewImg');
        imgInput.onchange = evt => {
            const [file] = imgInput.files;
                if (file) {
                    previewImg.src = URL.createObjectURL(file)
            }
        }
    </script>
</body>
</html>