Description
int define (string name, mixed value [, int
case_insensitive])
Defines a named constant, which is similar to a variable except:
Constants do not have a dollar sign '$' before them;
Constants may be accessed anywhere without regard to variable
scoping rules;
Constants may not be redefined or undefined once they have
been set; and
Constants may only evaluate to scalar values.
The name of the constant is given by name;
the value is given by value.
The optional third parameter
case_insensitive is also available. If the
value 1 is given, then the constant will be
defined case-insensitive. The default behaviour is
case-sensitive; i.e. CONSTANT and Constant represent different
values.
Example 1. Defining Constants
<?php
define ("CONSTANT", "Hello world.");
echo CONSTANT; // outputs "Hello world."
?>
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Define() returns TRUE on success and FALSE if
an error occurs.
See also defined() and the section on Constants.
Manual: define
