atyagi / specifier

Specification Pattern Implementation for PHP

Specifier

Provides a basic set of classes to utilize the specification design pattern.

Usage

The included tests provide common usage of the classes.

Basic Usage

Upon creating your specification classes, simply extend the AbstractSpecification class and implement the isSatisfiedBy method.

Any specifications that you create are flexible enough to take in any arguments in the constructor, such as repositories or services.

In addition, an isNotSatisfiedBy method is provided to provide a logical not if needed.

Composite Usage

When you need to chain multiple specifications on the same object, you can leverage the AbstractSpecification chain methods plus and either.

For example:

(new CustomerIsPremium())
    ->either(new CustomerRegisteredBeforeLastWeek())
    ->isSatisfiedBy($customer);

or

(new CustomerIsPremium())
    ->plus(new CustomerRegisteredBeforeLastWeek())
    ->isSatisfiedBy($customer);