(PHP 4 >= 4.0.4)
constant -- Returns the value of a constant
mixed constant (string name)
constant() will return the value of the
constant indicated by name.
constant() is useful if you need to retrieve
the value of a constant, but do not know it's name. i.e. It is
stored in a variable or returned by a function.
Example 1. constant() example
define ("MAXSIZE", 100);
echo constant("MAXSIZE"); // same thing as the previous line
See also define(),
defined() and the section on Constants.