Tag: PHP

Learn the five SOLID principles that guide maintainable object-oriented design.

Give each class one reason to change — one responsibility.

Make code open for extension but closed for modification.

Ensure subclasses can replace parent types without breaking callers.

Prefer composition (“has-a”) over deep inheritance (“is-a”) for flexible designs.

Understand how objects relate: association, aggregation, and composition.

Create object copies with clone and customize cloning via __clone.

Customize object behavior with magic methods like __get, __toString, and __invoke.

Check an object’s type with instanceof before calling type-specific APIs.

Expose controlled read/write access to private properties.