Course Content
PHP is an object-oriented scripting programming language that allows web developers to create dynamic and interactive web pages. PHP stands for Hypertext Preprocessor (PHP).
Control Statement
A control statement is a statement that determines whether other statements will be executed.
PHP for Beginners
About Lesson

Constants are PHP containers that remain constant and never change. Constants are used for data that is unchanged at multiple places within a program. Variables are temporary storage while Constants are permanent. Use Constants for values that remain fixed and referenced multiple times.


Rules for defining constant

PHP constants can be defined in 2 ways:

  • Using define() function
  • Using const keyword


Using define() function

define(name, value, case-insensitive)

name: Name of the constant

value: Value of the constant

case-insensitive: Whether a constant is case-insensitive, The default value is false.


Using const keyword

The const keyword defines constants at compile time. It is a language construct, not a function.

const MESSAGE = "Welcome to PHP";