Calculate age in PHP $your_birthday = '1982-08-29'; $difference = date_diff(date_create(), date_create($your_birthday)); $age = $difference->format('%Y'); // 35 Short and sweet

How to validate uniqueness in a :has_many :through relationship with Ruby on Rails. You'll need three models in this example List, Subscriber and ListSubscriber. A list has many subscribers and a subscriber has many lists. Simple enough. Running the follo...