<?php class BaseFunClass { const FIRST = 'first'; } class FunClass extends BaseFunClass { const SECOND = 'second'; } $class = 'FunClass'; $constantOne = 'FIRST'; $constantTwo = 'SECOND'; var_dump(constant("$class::$constantOne")); // Returns value! var_dump(constant("$class::$constantTwo")); // Says constant is not defined
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