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<?php class First { } class Second extends First { } function x(First $f) { var_dump($f); } x(new Second());

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

Output for Array change keys
object(Second)#1 (0) { }
Output for Lexical anon
object(Second)#1 (0) { }
Output for Typed properties
object(Second)#1 (0) { }

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