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# define

(PHP 3, PHP 4 )

define -- Defines a named constant.

## Description

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

Defines a named constant. See the section on constants for more details.

The name of the constant is given by `name`; the value is given by `value`.

The optional third parameter `case_insensitive` is also available. If the value `TRUE` is given, then the constant will be defined case-insensitive. The default behaviour is case-sensitive; i.e. CONSTANT and Constant represent different values.

Example 1. Defining Constants

    <?php
    define ("CONSTANT", "Hello world.");
    echo CONSTANT; // outputs "Hello world."
    echo Constant; // outputs "Constant" and issues a notice.

    define ("GREETING", "Hello you.",TRUE);
    echo GREETING; // outputs "Hello you."
    echo Greeting; // outputs "Hello you."

    ?>

define() returns `TRUE` on success and `FALSE` if an error occurs.

See also defined(), constant() and the section on Constants.

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