---
id: f3eefc1b-34f9-41e8-a22b-33e87f94c29a
title: define()
---

# Syntax

``` php
// Before
$resolver->setRequired('host');
$resolver->setDefaults(['host' => 'smtp.example.org']);
$resolver->setAllowedTypes('host', 'string');

// After
$resolver->define('host')
    ->required()
    ->default('smtp.example.org')
    ->allowedTypes('string');
```