Making some fields optional

Overview

Use PHP’s nullable types by prefixing type name with question mark (?) to declare component fields which are optional. Set a default value to prevent undesired defaults like nulls or empty strings.

Example

<?php
require 'examples/boot.php';

use Cognesy\Instructor\StructuredOutput;

class UserDetail
{
    public int $age;
    public string $firstName;
    public ?string $lastName;
}

$user = (new StructuredOutput)
    ->withMessages('Jason is 25 years old.')
    ->withResponseClass(UserDetail::class)
    ->get();

dump($user);

assert(!isset($user->lastName) || $user->lastName === '');
?>