defined

(PHP 3, PHP 4 )

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.

範例 1. Checking Constants

 ?php
if (defined("CONSTANT")){ // Note that it should be quoted
    echo CONSTANT; //
    }
? 


See also define(), constant(), get_defined_constants() and the section on Constants.