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<?php trait ClosureInATrait { public static function getConstInTrait() { return __CLASS__; } } class ClassConstantTest { use ClosureInATrait; public static function getConstInClass() { return __CLASS__; } } $closureInClass = (new ReflectionMethod('ClassConstantTest','getConstInClass'))->getClosure(); $closureInTrait = (new ReflectionMethod('ClassConstantTest','getConstInTrait'))->getClosure(); echo 'Before bind: ' . PHP_EOL; echo '__CLASS__ in class: ' . PHP_EOL; var_dump($closureInClass()); echo '__CLASS__ in Trait: ' . PHP_EOL; var_dump($closureInTrait()); $closureInClass = Closure::bind($closureInClass, null, 'stdClass'); $closureInTrait = Closure::bind($closureInTrait, null, 'stdClass'); echo 'After bind: ' . PHP_EOL . PHP_EOL; echo '__CLASS__ in class: ' . PHP_EOL; var_dump($closureInClass()); echo '__CLASS__ in Trait: ' . PHP_EOL; var_dump($closureInTrait());