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PHP Academy · Lesson

Implementing Interfaces

Define contracts with interface and implement them in multiple classes.

Intro: PHP Interfaces

An interface defines a contract: a list of method signatures that implementing classes must provide. Unlike abstract classes, a class can implement multiple interfaces.

Key Concepts

Key concepts:

  • Declare with interface Name {}
  • Methods have no body — only signatures
  • Implement with implements InterfaceName
  • A class can implement multiple interfaces

All lessons in this course

  1. Extending Classes with Inheritance
  2. Abstract Classes and Methods
  3. Implementing Interfaces
  4. Traits for Code Reuse
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