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Which of the following code can be used to create case insensitive constant?

<?php define("GREETING","How are you today?"); echo constant("greeting"); ?>

<?php define("GREETING","How are you today?",TRUE); echo constant("greeting"); ?>

<?php define("GREETING","How are you today?",FALSE); echo constant("greeting"); ?>

<?php define("GREETING","How are you today?",'USECASE'); echo constant("greeting"); ?>

Explanation: A constant can be defined by using the define() function. The define function is used to define a named constant. The syntax of the define function is as follows:

bool define ( string $name , mixed $value [, bool $case_insensitive = false ] )

To define the case-sensitive constant, you will write the code like this:

<?php
define("GREETING","How are you today?");
echo constant("GREETING");
?>

To define the case-insensitive constant, you will write the code like this:

<?php
define("GREETING","How are you today?",TRUE);
echo constant("greeting");
?>

Reference: http://php.net/manual/en/language.constants.php