Why isset function doesn't update my database?

Question

I don't understand why isset function doesn't work here:

include 'db.php';
if(isset($_POST['Submit'])) {

$name = $_POST['title'];
    $text = $_POST['text'];
    $category = $_POST['category'];

    $insert = mysqli_query($con,
    "INSERT INTO `items`(
    `title`, 
    `text`, 
    `category`
    ) 
    VALUES (
    '$name', 
    '$text', 
    '$category')"
    );
    if (!$insert) {
        echo mysqli_error($con);
    } else {
        echo "Inserted!";
    }
}




<form method="post">
<input type="text" name="title" placeholder="Enter the title..">
<input type="text" name="text" placeholder="Enter the text..">
<input type="text" name="category" placeholder="Enter the category..">
<input type="submit" value="Submit">
</form>

The database is not updated. Without that,my code is ok,but it's not what I want.

Answer 1

您的输入提交没有名称属性

<input type="submit" value="Submit" name="Submit">

Answer 2

您需要使用名称属性，名称属性的文本应与isset（$ _ POST ['submit']）相匹配