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.
Возвращаемые значения
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
Примеры
Example#1 Defining Constants
<?php define("CONSTANT", "Hello world."); echo CONSTANT; // outputs "Hello world." echo Constant; // outputs "Constant" and issues a notice.