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<?php $o=(object)array();$o->o=$o;$o->p=(object)array();var_dump($o);
Output for 5.2.14 - 5.2.17, 5.3.3 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 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(stdClass)#1 (2) { ["o"]=> *RECURSION* ["p"]=> object(stdClass)#2 (0) { } }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.13, 5.3.0 - 5.3.2
object(stdClass)#1 (2) { ["o"]=> object(stdClass)#1 (2) { ["o"]=> *RECURSION* ["p"]=> object(stdClass)#2 (0) { } } ["p"]=> object(stdClass)#2 (0) { } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
object(stdClass)(2) { ["o"]=> object(stdClass)(0) { } ["p"]=> object(stdClass)(0) { } }

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