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Define constant in Php

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");

Example

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

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