define

(PHP 4, PHP 5)

define — Defines a named constant

Description

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

Defines a named constant at runtime.

Parameters

name

The name of the constant.

value

The value of the constant; only scalar and null values are allowed. Scalar values are integer, float, string or boolean values.

case_insensitive

If set to TRUE, the constant will be defined case-insensitive. The default behaviour is case-sensitive; i.e. CONSTANT and Constant represent different values.

Return Values

Returns TRUE on success or FALSE on failure.

Examples

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."

?>

See Also

• defined()
• constant()
• The section on Constants