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define

(PHP 3, PHP 4, PHP 5)

define -- Defines a named constant

说明

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

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

例 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

defined()
constant()
The section on Constants



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