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<?php class SomeClass { protected stdClass $a; } $type = (new \ReflectionClass(SomeClass::class))->getProperty('a')->getType(); var_dump($type->isBuiltin());

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for branch master
Output for branch master_jit

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page