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formatDefaultValue example

class TextDescriptor extends Descriptor
{
    protected function describeInputArgument(InputArgument $argument, array $options = []): void
    {
        if (null !== $argument->getDefault() && (!\is_array($argument->getDefault()) || \count($argument->getDefault()))) {
            $default = sprintf('<comment> [default: %s]</comment>', $this->formatDefaultValue($argument->getDefault()));
        } else {
            $default = '';
        }

        $totalWidth = $options['total_width'] ?? Helper::width($argument->getName());
        $spacingWidth = $totalWidth - \strlen($argument->getName());

        $this->writeText(sprintf(' <info>%s</info> %s%s%s',
            $argument->getName(),
            str_repeat(' ', $spacingWidth),
            // + 4 = 2 spaces before <info>, 2 spaces after </info>