PHP5中文手册·Defines a named constant -- 追寻梦想＞编程乐园＞PHP 编程

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

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

defined()
constant()
The section on Constants


	PHP5中文手册 constant defined Misc. PHP Manual define (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 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 defined() constant() The section on Constants constant defined Misc. PHP Manual