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<?php $map = new WeakMap; $obj = new stdClass; $map[$obj] = 42; var_dump($map);
based on UIYGh

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

Output for branch master
object(WeakMap)#1 (1) { [0]=> array(2) { ["key"]=> object(stdClass)#2 (0) { } ["value"]=> int(42) } }
Output for branch master_jit
object(WeakMap)#1 (1) { [0]=> array(2) { ["key"]=> object(stdClass)#2 (0) { } ["value"]=> int(42) } }

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