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<?php $o1 = new stdClass(); $o2 = new stdClass(); var_dump($o1, $o2); unset($o1); $o3 = new ArrayObject([]); var_dump($o3);
Output for 8.1.32, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
object(stdClass)#1 (0) { } object(stdClass)#2 (0) { } object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(0) { } }

preferences:
71.54 ms | 406 KiB | 5 Q