(PHP 4, PHP 5)
define — Defines a named constant
Defines a named constant at runtime.
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. It is possible to define resource constants, however 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.
Returns TRUE on success or FALSE on failure.
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."
?>