php 한글 메뉴얼 도움말 검색 사이트 Defines a named constant [function.define]

설명

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

Defines a named constant at runtime.

인수

name: The name of the constant.
value: The value of the constant. In PHP 5, value must be a scalar value (integer, float, string, boolean, or NULL). In PHP 7, array values are also accepted.

Warning
While it is possible to define resource constants, it is not recommended and may cause unpredictable behavior.
case_insensitive: If set to TRUE, the constant will be defined case-insensitive. The default behavior is case-sensitive; i.e. CONSTANT and Constant represent different values.

Note:
Case-insensitive constants are stored as lower-case.

반환값

성공 시 TRUE를, 실패 시 FALSE를 반환합니다.

변경점

버전	설명
7.0.0	array values are allowed.

예제

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."

// Works as of PHP 7
define('ANIMALS', array(
    'dog',
    'cat',
    'bird'
));
echo ANIMALS[1]; // outputs "cat"

?>

참고

defined() - Checks whether a given named constant exists
constant() - 상수 값을 반환합니다
The section on Constants