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7.1 PHP What is OOP

From PHP5, you can also write PHP code in an object-oriented style.
Object-Oriented programming is faster and easier to execute.

PHP What is OOP?

OOP stands for Object-Oriented Programming.
Procedural programming is about writing procedures or functions that perform operations on the data, while object-oriented programming is about creating objects that contain both data and functions.
Object-oriented programming has several advantages over procedural programming:
- OOP is faster and easier to execute
- OOP provides a clear structure for the programs
- OOP helps to keep the PHP code DRY "Don't Repeat Yourself", and makes the code easier to maintain, modify and debug
- OOP makes it possible to create full reusable applications with less code and shorter development time
Tip: The "Don't Repeat Yourself" (DRY) principle is about reducing the repetition of code. You should extract out the codes that are common for the application, and place them at a single place and reuse them instead of repeating it.

PHP - What are Classes and Objects?

Classes and objects are the two main aspects of object-oriented programming.
Look at the following illustration to see the difference between class and objects:

class	objects
Fruit	Apple Banana Mango

Another example:

class	objects
Car	Volvo Audi Toyota

So, a class is a template for objects, and an object is an instance of a class.
When the individual objects are created, they inherit all the properties and behaviors from the class, but each object will have different values for the properties.
Look at the next chapters to learn more about OOP.

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Module 7. PHP OOP

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Module 6 quiz

Example files created in this module:
PHP Classes/Objects - Define a Class PHP Classes/Objects - Define Objects part 1 PHP Classes/Objects - Define Objects part 2 PHP Classes/Objects - The $this Keyword part 1 PHP Classes/Objects - The $this Keyword part 2 PHP Classes/Objects - instanceof PHP Constructor part 1 PHP Constructor part 2 PHP Destructor part 1 PHP Destructor part 2 PHP Access Modifiers part 1 PHP Access Modifiers part 2 PHP Inheritance PHP Inheritance - Inheritance and the Protected Access Modifier part 1 PHP Inheritance - Inheritance and the Protected Access Modifier part 2 PHP Inheritance - Overriding Inherited Methods PHP Inheritance - The final Keyword part 1 PHP Inheritance - The final Keyword part 2 PHP Class Constants part 1 PHP Class Constants part 2 PHP Abstract Classes part 1 PHP Abstract Classes part 2 PHP Abstract Classes part 3 PHP Interfaces - Using Interfaces part 1 PHP Interfaces - Using Interfaces part 2 PHP - Using Traits PHP - Using Multiple Traits PHP Static Methods part 1 PHP Static Methods part 2 PHP Static Methods part 3 PHP Static Methods part 4 PHP Static Properties part 1 PHP Static Properties part 2 PHP Static Properties part 3 menu Test (text file for navigating the site) Drop Down Menu PHP Namespaces - Declaring a Namespace PHP Namespaces - Using Namespaces part 1 PHP Namespaces - Using Namespaces part 2 PHP Namespaces - Namespace Alias part 1 PHP Namespaces - Namespace Alias part 2 PHP Iterables - Using Iterables part 1 PHP Iterables - Using Iterables part 2 PHP Iterables - Creating Iterables