PHP - Introduction
PHP - Setup
PHP - Syntax
PHP - String
PHP - constants
PHP - Operators
PHP - Superglobals
PHP Forms PHP - Forms
MySQL - Create DB
MySQL - Update Data
MySQL - Delete Data

PHP constants

A constant is an identifier or name for a simple value. As the name suggests, that value cannot change at time of the execution of the script,It is used for at time of configurations.

Syntax: define(name, value);

define(firstConstant, "Welcome to Constant Program");
echo firstConstant;

Result: Welcome to Constant Program