3v4l.org

run code in 500+ PHP versions simultaneously
<?php $ao = new ArrayObject(['foo' => 'bar'], ArrayObject::ARRAY_AS_PROPS); var_dump(isset($ao->foo), isset($ao->bar));
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.33, 8.4.1 - 8.4.26, 8.5.0 - 8.5.9
bool(true) bool(false)
preferences:
32.48 ms | 1136 KiB | 8 Q