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<?php trait Foo {} $ref = new ReflectionClass('Foo'); var_dump($ref->isAbstract());
based on s6iu9
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.26, 7.4.0 - 7.4.14, 8.0.0
bool(false)
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
bool(true)