(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.
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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.
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