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@ 2020-09-01T08:46:33Z

<?php

$ao = new ArrayObject(['foo' => 'bar'], ArrayObject::ARRAY_AS_PROPS);
var_dump(isset($ao->foo), isset($ao->bar));

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

123.24 ms | 1539 KiB | 5 Q