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run code in 300+ PHP versions simultaneously
<?php $x = new stdclass; $x->{42} = 1337; $x = (array)$x; var_dump($x); foreach ($x as $key => $value) { if (!array_key_exists($key, $x)) echo 'lolphp'; } ?>

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56.5 ms | 402 KiB | 5 Q