defined

(PHP 3, PHP 4 )

defined --  Checks whether a given named constant exists

Description

int 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.


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