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<?php define("MAXSIZE", 100); echo MAXSIZE; echo constant("MAXSIZE"); // same thing as the previous line interface bar { const test = 'foobar!'; } class foo { const test = 'foobar!'; } $const = 'test'; var_dump(constant('bar::'. $const)); // string(7) "foobar!" var_dump(constant('foo::'. $const)); // string(7) "foobar!" ?>