I have created a form to update/edit rows in my database. This form works on updating the ID related to selected row that is updated. The page that this is selected from is displayed based on a different parameter/column than the ID. When I submit the form, I am trying to return to this page, but I cannot seem to get it to work based on this parameter, as it seems to return null instead of the update row. I have attached my coding below. edit.php

$id = (int) ($_GET['id'] ?? 0);


$birdRepository = new BirdRepository($pdo);
$model = $birdRepository->fetchById($id);
//var_dump($model);

if (empty($model)) {
    header('Location: index.php');
    die();
}


if (!empty($_POST)) {
    $type = (string) ($_POST['type']);
    $dob = (string)($_POST['dob']);
    $tagColour = (string) ($_POST['tagColour'] ?? '');
    $qty = (int) ($_POST['qty']);


    if (
        empty($type) ||
        empty($dob) ||
        empty($tagColour) ||
        empty($qty)
    ) {

        header('Location: index.php');
        die();
    }

    $model = $birdRepository->update(
        $id,
        $type,
        $dob,
        $tagColour,
        $qty
    );

    header('location: bird.php');
    // return;
}

render('edit.view', [
    'birds' => $model
]);

update function:

    public function update(int $id, string $type, string $dob, string $tagcolour, int $qty)
    {
        $stmt = $this->pdo->prepare(
            'UPDATE `birds` 
            SET 
                `type` = :type,
                `dob` = :dob,
                `tag_colour` = :tagColour,
                `qty` = :qty
                WHERE `id` = :id'
        );

        $stmt->bindValue(':id', $id);
        $stmt->bindValue(':type', $type);
        $stmt->bindValue(':dob', $dob);
        $stmt->bindValue(':tagColour', $tagcolour);
        $stmt->bindValue(':qty', $qty);
        $stmt->execute();

        return $this->fetchById($id);
    }
}

edit.view

Update existing entry


    Bird Type:
    

    DOB:
    

    Leg Tag Colour:
    

    Qty:
    

    

    

bird.view (this is the page I want it to return too

Bird: 


    

        
DOB
        
Current Age
        
Leg Tag Colour
        
Qty
    
    
        

            
dob))); ?>
            
dob); ?>
            
tagColour); ?>
            
qty); ?>
            

                Edit
            
        
    

This the error I get on that page after a form is submitted:

Warning: foreach() argument must be of type array|object, null given in C:\xampp\htdocs\bird ages\views\pages\bird.view.php on line 10