How to use defined in PHP

In this article I will explain how defined Function can be used in PHP.
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defined() Function

This function checks whether a constant exists.

Returns TRUE if the constant exists, or FALSE otherwise.

Syntax

defined(name)

 

Parameter  Description
name  Required. Specifies the name of the constant to check

Example

<html>
<body>
<?php
define("GREETING","Hello you! How are you today?");
echo defined("GREETING");
?>
</body>
</html>

 

Output

defined-php.jpg

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