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<?php $f = function () use (&$f) { unset($f); }; $f(); var_dump($f);
Output for 5.3.3 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> *RECURSION* } }
Output for 5.3.1 - 5.3.2
object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> *RECURSION* } } } }
Output for 5.3.0
object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=> array(1) { ["f"]=> &object(Closure)#1 (1) { ["static"]=>
Process exited with code 137.

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