How to use define() function in php

How to use the define() function in php: The define() function is used to define a constant, syntax: [define(name,value,case_insensitive)]. For example: [define("GREETING","Hello world!")].

Function:

define() function is used to define a constant.

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Grammar:

define(name,value,case_insensitive)

Parameter introduction:

• name is required. Specifies the name of the constant.

• value is required. Specifies the value of the constant.

• case_insensitive Optional. Specifies whether constant names are case-sensitive. If set to true, it is not case sensitive. Default is false (case sensitive).

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Example:

Define a case-sensitive constant:

<?php
define("GREETING","Hello world!");
echo constant("GREETING");
?>

Output:

Hello world!

Define a case-insensitive constant:

<?php
define("GREETING","Hello world!",TRUE);
echo constant("greeting");
?>

Output:

Hello world!

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