📅  最后修改于: 2022-03-11 14:54:19.456000             🧑  作者: Mango
'foo');
var_dump(isset($obj->{'1'})); // outputs 'bool(true)' as of PHP 7.2.0; 'bool(false)' previously
var_dump(key($obj)); // outputs 'string(1) "1"' as of PHP 7.2.0; 'int(1)' previously
?>