I

input validation

A comprehensive PHP validation library with support for 50+ validation rules, custom rules, profiles, and multi-language error messages

For a mind-free weekend getaway, it allocates individuals to vehicles, ensuring each has ≥2 drivers, following rules and preferences. It initializes, allocates drivers, assigns remaining individuals based on preferences, and validates the allocation, employing a greedy approach, returning None if any step fails, or the achieved allocation otherwise.