Web Reference: Interfaces make it easy to use a variety of different classes in the same way. When one or more classes use the same interface, it is referred to as "polymorphism". The following example defines an interface named Animal, with two public methods (fromFamily () and makeSound ()). In PHP, interfaces contain only method declaration and not the actual implementation. Abstract classes, however, allow you to "add code" to the methods to be inherited by the classes that extend it. Mar 28, 2026 · PHP Traits vs Abstract Classes vs Interfaces: When to Use Each PHP's OOP system gives you three tools for sharing behavior -- traits, abstract classes, and interfaces -- but each one solves a fundamentally different problem. Picking the wrong one leads to brittle hierarchies, duplicated logic, or code that's nearly impossible to test.
YouTube Excerpt: In this OOP
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