Misc. 函数
PHP 手册

define

(PHP 4, PHP 5)

defineDefines a named constant

说明

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

Defines a named constant at runtime.

参数

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.

返回值

如果成功则返回 TRUE,失败则返回 FALSE

范例

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."

?>

参见


Misc. 函数
PHP 手册