Question Helper

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use Symfony\Component\Console\Question\ChoiceQuestion;

// ...
public function execute(InputInterface $input, OutputInterface $output): int
{
    // ...
    $helper = $this->getHelper('question');
    $question = new ChoiceQuestion(
        'Please select your favorite color (defaults to red)',
        // choices can also be PHP objects that implement __toString() method
        ['red', 'blue', 'yellow'],
        0
    );
    $question->setErrorMessage('Color %s is invalid.');

    $color = $helper->ask($input, $output, $question);
    $output->writeln('You have just selected: '.$color);

    // ... do something with the color

    return Command::SUCCESS;
}

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use Symfony\Component\Console\Question\Question;

// ...
public function execute(InputInterface $input, OutputInterface $output): int
{
    // ...
    $helper = $this->getHelper('question');

    $bundles = ['AcmeDemoBundle', 'AcmeBlogBundle', 'AcmeStoreBundle'];
    $question = new Question('Please enter the name of a bundle', 'FooBundle');
    $question->setAutocompleterValues($bundles);

    $bundleName = $helper->ask($input, $output, $question);

    // ... do something with the bundleName

    return Command::SUCCESS;
}

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use Symfony\Component\Console\Question\Question;

// ...
public function execute(InputInterface $input, OutputInterface $output): int
{
    $helper = $this->getHelper('question');

    // This function is called whenever the input changes and new
    // suggestions are needed.
    $callback = function (string $userInput): array {
        // Strip any characters from the last slash to the end of the string
        // to keep only the last directory and generate suggestions for it
        $inputPath = preg_replace('%(/|^)[^/]*$%', '$1', $userInput);
        $inputPath = '' === $inputPath ? '.' : $inputPath;

        // CAUTION - this example code allows unrestricted access to the
        // entire filesystem. In real applications, restrict the directories
        // where files and dirs can be found
        $foundFilesAndDirs = @scandir($inputPath) ?: [];

        return array_map(function ($dirOrFile) use ($inputPath) {
            return $inputPath.$dirOrFile;
        }, $foundFilesAndDirs);
    };

    $question = new Question('Please provide the full path of a file to parse');
    $question->setAutocompleterCallback($callback);

    $filePath = $helper->ask($input, $output, $question);

    // ... do something with the filePath

    return Command::SUCCESS;
}

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use Symfony\Component\Console\Question\Question;

// ...
public function execute(InputInterface $input, OutputInterface $output): int
{
    // ...
    $helper = $this->getHelper('question');

    $question = new Question('What is the name of the child?');
    $question->setTrimmable(false);
    // if the users inputs 'elsa ' it will not be trimmed and you will get 'elsa ' as value
    $name = $helper->ask($input, $output, $question);

    // ... do something with the name

    return Command::SUCCESS;
}

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use Symfony\Component\Console\Question\Question;

// ...
public function execute(InputInterface $input, OutputInterface $output): int
{
    // ...
    $helper = $this->getHelper('question');

    $question = new Question('How do you solve world peace?');
    $question->setMultiline(true);

    $answer = $helper->ask($input, $output, $question);

    // ... do something with the answer

    return Command::SUCCESS;
}

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use Symfony\Component\Console\Question\Question;

// ...
public function execute(InputInterface $input, OutputInterface $output): int
{
    // ...
    $helper = $this->getHelper('question');

    $question = new Question('What is the database password?');
    $question->setHidden(true);
    $question->setHiddenFallback(false);

    $password = $helper->ask($input, $output, $question);

    // ... do something with the password

    return Command::SUCCESS;
}

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use Symfony\Component\Console\Question\Question;

// ...
public function execute(InputInterface $input, OutputInterface $output): int
{
    // ...
    $helper = $this->getHelper('question');

    $question = new Question('Please enter your password');
    $question->setNormalizer(function ($value) {
        return $value ?? '';
    });
    $question->setValidator(function ($value) {
        if ('' === trim($value)) {
            throw new \Exception('The password cannot be empty');
        }

        return $value;
    });
    $question->setHidden(true);
    $question->setMaxAttempts(20);

    $password = $helper->ask($input, $output, $question);

    // ... do something with the password

    return Command::SUCCESS;
}