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@ 2021-09-09T17:00:15Z

<?php

$arrayObject = new ArrayObject();
$arrayObject->append(new stdClass());
$arrayObject->append(new stdClass());

var_dump(key($arrayObject));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
key: documentation ( source)

preferences:dark modelive previewkey bindings

20.86 ms | 475 KiB | 4 Q