(PHP 3, 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; //
}
?>
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See also define(),
constant() and the section on Constants.