How can the issue of missing input fields for variables like $lastname and $kz be resolved in the PHP code?

The issue of missing input fields for variables like $lastname and $kz can be resolved by checking if the input fields are set before trying to access their values. This can be done using the isset() function in PHP. By checking if the input fields are set, we can avoid errors when trying to access their values. 

$firstname = $_POST['firstname'] ?? '';
$lastname = isset($_POST['lastname']) ? $_POST['lastname'] : '';
$kz = isset($_POST['kz']) ? $_POST['kz'] : '';

// Use the variables $firstname, $lastname, and $kz in your code

Keywords

input fields variables PHP code missing resolution

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