HTML Form with PHP: $_POST is not setting on submit [closed] - php

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Background:
I have looked through the variations on this question and solutions, but I have not found one that applies to my situation. I know I'm most likely overlooking something incredibly obvious, but it's been hours and I can't for the life of me pinpoint what it is. I'm following along with this tutorial but making it my own: https://www.taniarascia.com/create-a-simple-database-app-connecting-to-mysql-with-php/.
What happens: When I click the submit button, nothing happens. I see "not set" displayed on the screen when the page loads and after clicking submit, so I know I'm in my else block, which means $_POST is not being set.
What I expect to happen: I expect to see "not set" on page load, but then once I have filled out the form and clicked submit, I expect to see "set" in my echo statement to indicate that I'm in my if statement and isset($_POST['submit']) is true/successful, followed by "Success" indicating that the try code block was successful, plus the values I entered in the form fields appearing in the database. For now, though, I'd just be happy if I got that first "set" to display.
I have tried: I've tried breaking out the php into a separate file and linking it up to the form via action="thatfile.php", but I get the same result. I've also tried using "get" instead of "post" for the method and $_REQUEST instead of $_POST, but again, same outcome - "not set" displayed, no data in the db.
Here is my code:
<?php
if (isset($_POST['submit'])) {
require "../config.php";
echo "set";
try {
$connection = new PDO($dsn, $username, $password, $options);
$new_item = array(
"luggage" => $_POST['luggage'],
"category" => $_POST['category'],
"item" => $_POST['item'],
"description" => $_POST['description']
);
$sql = sprintf(
"INSERT INTO %s (%s) values (%s)",
"stuff",
implode(", ", array_keys($new_item)),
":" . implode(", :", array_keys($new_item))
);
$statement = $connection->prepare($sql);
$statement->execute($new_item);
echo "Success";
} catch(PDOException $error) {
echo $sql . "<br>" . $error->getMessage();
}
} else {
echo "not set";
}
?>
<?php include "header.php"; ?>
<h1>Add An Item</h1>
<form method="post">
<label for="item">Luggage</label>
<input type="text" name="luggage" id="luggage"></form>
<label for="item">Category</label>
<input type="text" name="category" id="category"></form>
<label for="item">Item</label>
<input type="text" name="item" id="item"></form>
<label for="description">Description</label>
<input type="text" name="description" id="description">
<input type="submit" name="submit" value="submit">
</form>
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<?php include "footer.php"; ?>

Answer 1

You are closing the form </form> multiple times before the final end of the form </form> so the submit is not in the form. Remove these:
<label for="item">Luggage</label>
<input type="text" name="luggage" id="luggage"></form> ***HERE***
<label for="item">Category</label>
<input type="text" name="category" id="category"></form> ***HERE***
<label for="item">Item</label>
<input type="text" name="item" id="item"></form> ***HERE***