How can the third parameter in the define() function be used to specify the case sensitivity of a constant in PHP?

When defining constants in PHP using the `define()` function, the third parameter can be used to specify whether the constant name should be case-insensitive or case-sensitive. By default, constants are case-sensitive in PHP. To make a constant case-insensitive, you can set the third parameter to `true`. 

// Define a case-sensitive constant
define('MY_CONSTANT', 'Hello World');

// Define a case-insensitive constant
define('MY_CONSTANT_CASE_INSENSITIVE', 'Hello World', true);

Keywords

define() function case sensitivity constant PHP

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