What is a PHP constant

A PHP constant is a simple identifier for a value that cannot be changed during the execution of a script. Once a constant is defined, it remains constant throughout the script and cannot be redefined or undefined. Constants are defined using the `define()` function or the `const` keyword and are typically used for configuration values or fixed reference values that should not change.

Here is an example of defining a constant in PHP:

<?php define('SITE_NAME', 'My Awesome Website'); echo SITE_NAME; // Outputs: My Awesome Website ?>

PHP constant define function const keyword unchangeable value PHP programming

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