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<?php $key = 1; $obj = new stdClass; $obj->$key = 'val'; $arr = (array) $obj; var_dump($arr); var_dump($key); var_dump(isset($arr[$key]));
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array(1) { [1]=> string(3) "val" } int(1) bool(true)
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
array(1) { ["1"]=> string(3) "val" } int(1) bool(false)

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