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define

PHP Manual
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define

(PHP 3, 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

The section on Constants

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