PHP Constants
In this tutorial you will learn how use constants for storing fixed values in PHP.
What is Constant in PHP
A constant is a name or an identifier for a fixed value. Constant are like variables, except that once they are defined, they cannot be undefined or changed (except magic constants).
Constants are very useful for storing data that doesn't change while the script is running. Common examples of such data include configuration settings such as database username and password, website's base URL, company name, etc.
Constants are defined using PHP's define() function, which accepts two arguments: the name of the constant, and its value. Once defined the constant value can be accessed at any time just by referring to its name. Here is a simple example:
Example
Run this code »<?php // Defining constant define("SITE_URL", "https://www.tutorialrepublic.com/"); // Using constant echo 'Thank you for visiting - ' . SITE_URL; ?>
The output of the above code will be:
Thank you for visiting - https://www.tutorialrepublic.com/
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