Define constant in Php

If you're working with PHP, one of the most important concepts you should know is constants — and that’s where define() comes in 🚀

🔹 What is define()?
define() is a built-in PHP function used to create a constant value that cannot be changed during script execution.

🔹 Why use constants?
Constants are perfect for storing values that should remain fixed, like:

• Website name
• Database credentials
• API keys
• Company details

🔹 Basic Syntax:

define("CONSTANT_NAME", "value");


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Code 

<?php

define("channel","youtube@phpecho");

define("contact","+91-2221221221");

?>

<?php echo channel; ?>

<?php echo contact; ?>