Symfony version(s) affected

2.1-7.1

Description

In the constructor of Symfony\Component\Console\Input\InputOption there is some code to check for empty values of $shortcut:

        if (empty($shortcut)) {
            $shortcut = null;
        }

        if (null !== $shortcut) {
            if (\is_array($shortcut)) {
                $shortcut = implode('|', $shortcut);
            }
            $shortcuts = preg_split('{(\|)-?}', ltrim($shortcut, '-'));
            $shortcuts = array_filter($shortcuts);
            $shortcut = implode('|', $shortcuts);

            if (empty($shortcut)) {
                throw new InvalidArgumentException('An option shortcut cannot be empty.');
            }
        }

Presumably the goal is to disallow empty strings as shortcut values.

But the use of array_filter with the default/empty callback here prevents using a shortcut like -0, because '0' evaluates to false. (While uncommon, -0 might be used in a command-line application to enable null-terminated output - see for example xargs or locate)

How to reproduce

Configure the following input option on any console command:

new InputOption('null-terminated', '0', description: 'Print null-terminated output')

Observe the exception when executing the command:

 An option shortcut cannot be empty.

Possible Solution

#53516

Additional Context

No response