Responsability¶
Responsibility refers to a reason to change or a goal to achieve. A class, module, or function should have one, and only one, responsibility: this means it should do one thing and do it well.
Responsability often relate to the key idea of Single Responsibility Principle, the SRP.
The SRP is the S in SOLID, formalized by Robert C. Martin. It states: A class should have only one reason to change.
When a class handles both business rules and database storage, it has two responsibilities: and therefore two reasons to change. This happens when business rules change or when the database schema changes, or both.
See also Single Responsibility Principle(SRP) example using PHP.
Related : SOLID, Single Responsability Principle (SRP), Accountability
