我收到這個錯誤：注意：嘗試訪問 null 類型值的數組偏移量當我想更新的時候。我把代碼放在下面，請幫助我如何解決這個問題以及故障和問題在哪里？（正常情況下沒有錯誤，但是當我使用ctrl+U并查看源代碼時，所有字段都顯示該錯誤。）我在網站上搜索了很多，但沒有找到正確的答案或結果。在editform.php中<?phpinclude_once "InsertDataDatabases.php";$id = (isset($_POST['id']) ? $_POST['id'] : '');$query = InsertDataDatabases::SelectDateId($id);$item = [];$item = mysqli_fetch_assoc($query);?><form action="updatedata.php" method="post" enctype="multipart/form-data"> <?php CSRF::CreateToken(); ?> <input type="text" name="id" value="<?php echo $item['id']; ?>"><br> <label for="name">Name:</label> <input type="text" name="name" value="<?php echo $item['name']; ?>"><br><br> <label for="email">Email:</label> <input type="email" name="email" value="<?php echo $item['email']; ?>"><br><br> <input type="file" name="image" value="images/slider/<?php echo $item['image']; ?>"><br> <img src="images/slider/<?php echo $item['image']; ?> " width="50px" height="50px" alt=''><br> <input type="submit" name="updatebtn" value="UPDATE"></form>在 updatedata.php 中<?phpinclude_once "InsertDataDatabases.php";include_once "DataBase.php";include_once "CSRF.php";$con = DataBase::ConnectOpen();if ($_SERVER['REQUEST_METHOD'] == 'POST') { if (isset($_POST['updatebtn'])) { if (CSRF::ValidateToken($_POST["token"])) { $id = htmlentities(mysqli_real_escape_string($con, $_POST['id'])); $name = htmlentities(mysqli_real_escape_string($con, $_POST['name'])); $email = htmlspecialchars(mysqli_real_escape_string($con, filter_var(trim($_POST['email']), FILTER_SANITIZE_EMAIL))); $image = $_FILES['image']; InsertDataDatabases::UpdateData($id, $name, $email, $image); mysqli_close($con); header("Location: index.php"); } }}并在 InsertDataDatabases.php 中public static function SelectDateId($id) { self::ConnectDataBase(); return mysqli_query(self::$con, "SELECT * FROM user WHERE id = '{$id}'"); }
1 回答
侃侃爾雅
TA貢獻1801條經驗 獲得超16個贊
當您查看源代碼時，您沒有發布表單，因此$_POST未設置該變量。$_POST在嘗試使用該變量之前，您應該檢查該變量是否已設置。
<?php
include_once "InsertDataDatabases.php";
if (isset($_POST['id'])) {
$id = $_POST['id'];
$query = InsertDataDatabases::SelectDateId($id);
$item = [];
$item = mysqli_fetch_assoc($query);
?>
<form action="updatedata.php" method="post" enctype="multipart/form-data">
<?php CSRF::CreateToken(); ?>
<input type="text" name="id" value="<?php echo $item['id']; ?>"><br>
<label for="name">Name:</label>
<input type="text" name="name" value="<?php echo $item['name']; ?>"><br><br>
<label for="email">Email:</label>
<input type="email" name="email" value="<?php echo $item['email']; ?>"><br><br>
<input type="file" name="image" value="images/slider/<?php echo $item['image']; ?>"><br>
<img src="images/slider/<?php echo $item['image']; ?> " width="50px" height="50px" alt=''><br>
<input type="submit" name="updatebtn" value="UPDATE">
</form>
<?php }
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