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Learn Object Oriented Programming PHP fundamentals bootcamp | Lecture-10

Learn Object-Oriented Programming in PHP with Udemy Course: Understanding Constants

Are you looking to expand your knowledge of object-oriented programming in PHP? The latest lesson from the Udemy course "PHP Fundamentals Bootcamp" delves into the topic of constants and how they can benefit your programming.

In this lesson, you will learn:
  • What constants are and how they differ from properties
  • How to access constants both inside and outside of a class
  • The syntax for accessing constants
  • Best practices for using constants in your code

Benefits of Understanding Constants in Object-Oriented Programming

Constants provide a way to define and access global values that remain unchanged throughout the program. By using constants, you can avoid hard-coding values throughout your code, making it easier to maintain and update. Here are some benefits of understanding constants in object-oriented programming:

  • Efficiency: Constants can improve the efficiency of your code by avoiding the creation of unnecessary objects. Unlike properties, which require an object instance to access, constants can be accessed globally without the need for an object.
  • Code Readability: By using constants, you can improve the readability of your code by defining values that are used throughout your program in a single location.
  • Ease of Maintenance: When values are defined as constants, you can easily update them without the need to search through your codebase for each instance of the value. This can save time and reduce the risk of introducing errors in your code.

How to Access Constants in PHP

Accessing constants in PHP requires a different syntax than accessing properties. In the Udemy course, the following syntax is used to access constants:
self::CONSTANT_NAME
Where CONSTANT_NAME is the name of the constant you wish to access.

Best Practices for Using Constants in Your Code

To maximize the benefits of constants in your code, here are some best practices to keep in mind:

  • Define constants in a separate file or class: By defining constants in a separate file or class, you can easily access them throughout your code.
  • Use uppercase letters for constant names: To make constants stand out from other variables in your code, it is common practice to use uppercase letters for the names of constants.
  • Avoid redefining constants: Once a constant is defined, it cannot be redefined. This means that you should avoid using the same name for different constants.
By following these best practices, you can ensure that your code is efficient, readable, and maintainable.

Learning about constants in object-oriented programming using PHP can greatly benefit aspiring programmers and web developers. With constants, users can easily access global values without having to set up a new object, making their coding more efficient and streamlined. By understanding the syntax and different ways to reference constants within classes, developers can improve their coding skills and create more effective programs. Additionally, the use of constants can be expanded beyond individual classes by setting them up in a separate constant class and accessing them throughout the code. 


  • The lecture discusses constants in object-oriented programming in PHP.
  • Constants are globally available values that can be accessed both inside and outside of the class without setting up a new object.
  • The syntax for accessing constants is different from accessing properties.
  • The lecture demonstrates three different ways to access the same constant value in a car blueprint class.
  • Constants are typically defined in a separate constant class for easy access throughout the code.

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