(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)
defined --
Checks whether a given named constant exists
Description
bool defined (string name)
Returns TRUE if the named constant given by
name has been defined,
FALSE otherwise.
Example 1. Checking Constants <?php
if (defined("CONSTANT")){ // Note that it should be quoted
echo CONSTANT; //
}
?> |
|
See also define(),
constant() and the section on Constants.