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defined (PHP 3, PHP 4 ) defined -- Checks whether a given named constant exists Descriptionbool defined ( string name)
Returns TRUE if the named constant given by name has been defined, FALSE otherwise.
Example 1. Checking Constants <?php
/* Note the use of quotes, this is important. This example is checking
* if the string 'CONSTANT' is the name of a constant named CONSTANT */
if (defined('CONSTANT')) {
echo CONSTANT;
}
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See also define(), constant(), get_defined_constants(), function_exists(), and the section on Constants.
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