Introduction to Object-Oriented Programming (OOP)

The acronym OOP stands for Object-Oriented Programming. While in procedural programming we write functions that perform operations on data, in OOP we focus on creating objects. These objects combine both data (properties) and functions (methods), which allows for more natural and organized code writing.

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Main Advantages of Using OOP in Practice

If you are wondering why you should switch from regular functions to an object-oriented approach, the list below reveals four key reasons that make daily work with larger and more complex applications easier for modern developers:

OOP is faster and easier to execute, as the overall logic very accurately maps and follows relationships from the real world.
OOP provides a clear, modular program structure, which prevents spaghetti code and greatly facilitates teamwork.
OOP strictly follows the DRY (Don't Repeat Yourself) principle. You write the code only once, which makes subsequent maintenance and debugging much easier.
OOP allows for extremely easy code reuse. A correctly written and tested class can be used in ten different projects without any changes.

Guide to Key Concepts of Object-Oriented Programming

The interactive table below will take you through the fundamental pillars of OOP in the PHP language. Each concept contains a brief theoretical description, and by clicking the button, you can open a practical code example to see how theory is turned into a working program:

Name	Description	Example
`Classes`	How to correctly structure a class and its properties.	▶ Code example
`Objects`	How to create a concrete object from a class and manage it.	▶ Code example
`Inheritance`	A mechanism where one class inherits the properties and methods of another class.	▶ Code example
`Constructor`	A special method that prepares an object immediately upon its creation.	▶ Code example
`Destructor`	A method that cleans up resources when an object is no longer needed or the script ends.	▶ Code example
`Modifiers`	Determining security: Who can see the data (public, private, protected).	▶ Code example
`Constants`	Fixed values within classes that do not change during execution.	▶ Code example
`Polymorphism`	The ability of different classes to respond to the same method call in their own way.	▶ Code example
`Encapsulation`	Hiding internal operational details from the outside world for increased security.	▶ Code example
`Namespaces`	Preventing naming conflicts by using logical folders within the code.	▶ Code example
`Iterable Parameter`	Using the Iterable type to work with data lists in loops.	▶ Code example