This document provides an overview of object-oriented programming (OOP) concepts in PHP. It discusses previous programming trends like procedural and structured languages. It then covers key OOP concepts like classes, objects, inheritance, polymorphism, and abstraction. Specific PHP OOP features are explained like class diagrams, access modifiers, constructors, destructors, static members, and class constants. Examples are provided to demonstrate classes, inheritance, polymorphism, abstract classes, interfaces, and exceptions. The document concludes with an assignment to model person, student, and teacher relationships using PHP classes.