<?php $x = get_object_vars(json_decode('{"2":1}')); $y = (object)$x; $exprs = ['isset($x[2])', 'isset($x["2"])', 'isset($y->{2})', 'isset($y->{"2"})', '$x', '$y']; var_dump(array_map(function ($expr) use ($x, $y) { return eval("return $expr;"); }, array_combine($exprs, $exprs)));
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