New in Symfony 5.1 OptionsResolver improvements

Fluent Interface

Contributed by Lorenzo Millucci in #33848

It's common to configure several features for each option (its allowed types, its default values, whether it's required or not, etc.) Thanks to the new define() method, you can use a fluent interface to configure everything about an option without repeating its name in different methods:

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// 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');

Option Debug Information

Contributed by Yonel Ceruto in #35400

Sometimes, the name of an option or its highly dynamic feature makes it hard to understand the error messages generated by Symfony. That's why in Symfony 5.1 we've introduced a new method which improves DX (developer experience) allowing you to add a description/help/debug message for the option.

Imagine that you define a datetime option whose value must be in the future:

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$resolver->setAllowedValues('scheduledAt', static function ($value): bool {
    return $value >= new \DateTime('now');
});

This is the standard error message displayed by Symfony in this case:

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The option "scheduledAt" with value DateTime is invalid.

However, if you add the info() or setInfo() methods:

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// using the traditional syntax
$resolver->setInfo('scheduledAt', 'It must be a date in the future.');

// using the fluent interface
$resolver->define('scheduledAt')
    // ...
    ->info('It must be a date in the future.');

The error message displayed now is:

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The option "scheduledAt" with value DateTime is invalid.
Info: It must be a date in the future.