Gain insights into object-oriented programming in PHP. Discover classes, objects, methods, inheritance, and more. Build dynamic server-side applications using OOP techniques and PHP database management.

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Object-oriented programming is perhaps the dominant development paradigm for leading languages including Java, C#, and Python. The rich class and inheritance framework wasn’t fully implemented in modern PHP until 2015, and best practices for object-oriented programming are still emerging.

This course is an introduction to object-oriented programming in PHP. You’ll start with the basics of the OOP paradigm and get familiar with classes, objects, methods, and properties. You’ll then chain methods and properties using the this keyword before working with access modifiers and magic methods. With these basics down, you’ll take a deep dive into object-oriented programming in PHP, including inheritance, abstraction, polymorphism, and namespaces. After exploring exception handling, you’ll use these object-oriented techniques to build, manage, and edit a PHP database.

By the end of this course, you’ll be prepared to build dynamic server-side applications using object-oriented programming in PHP.

Object-Oriented Programming in PHP

# Task

You are given a `User` class with the methods that set and get the user name and age.

* Add code to the `setName()` method that throws the exception `“The name should be at least 3 characters long”` whenever the user’s name is shorter than 3 letters.
* Add code to the `setAge()` method that throws the exception `“The age cannot be zero or less”` whenever the user’s age is less than or equal to zero.
* In the `test()` method, feed the class with this nested array:
  ```
  $dataForUsers = array( 
   array("Ben",4),
   array("Eva",28), 
   array("li",29), 
   array("Catie","not yet born"), 
   array("Sue",1.5)
  );
  ```
* Write a `foreach` loop (like the one we've already used in this chapter) that feeds the array to the class and handles the exceptions by echoing the custom error messages as well as the file path in which the exception was thrown.

# Expected output

   ```
   Ben is 4 years old. Eva is 28 years old. Error: The name should be at least 3 characters long in the file: /usercode/main.php. Error: The age cannot be zero or less in the file: /usercode/main.php. Sue is 1 years old. 
   ```

# Coding exercise

Since these problems are designed for your practice,  try to solve them yourself first. If you get stuck, you can click the “Show Solution” button to see how the problem can be solved. Good luck!


Try to implement a class using proper exception messages for invalid input.

Introduction

Classes and Objects

Using the $this Keyword for Chaining Methods and Properties

Access Modifiers

Magic Methods and Constants Unveiled

Inheritance in Object-oriented Programming

Abstract Classes and Interfaces

Polymorphism and Type Hinting

Static Methods & Properties and Traits

Namespaces & Dependency Injection

Exception Handling

PHP Database

Model-view-controller (MVC)

Conclusion

Appendix

Challenge: Exception Handling

Task