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<?php trait Boo { protected self $coo; } class Foo { use Boo; } $rc = new ReflectionClass(Foo::class); $rpp = $rc->getProperty('coo'); var_dump($rpp->getType()->getName());
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(4) "self"

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