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<?php $obj = new \stdClass; $obj->{"12"} = "foobar"; $arr = ((array)$obj); var_dump($arr, isset($arr["12"])); $arr = get_object_vars($obj); var_dump($arr, isset($arr["12"]));
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 8.0.0 - 8.0.12, 8.1rc1 - rc3
array(1) { [12]=> string(6) "foobar" } bool(true) array(1) { [12]=> string(6) "foobar" } bool(true)
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.17 - 7.0.20, 7.1.3 - 7.1.33
array(1) { ["12"]=> string(6) "foobar" } bool(false) array(1) { [12]=> string(6) "foobar" } bool(true)
Output for 7.0.0 - 7.0.16, 7.1.0 - 7.1.2
array(1) { ["12"]=> string(6) "foobar" } bool(false) array(1) { ["12"]=> string(6) "foobar" } bool(false)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/tofaS on line 2 array(1) { ["12"]=> string(6) "foobar" } bool(false) array(1) { [12]=> string(6) "foobar" } bool(true)
Output for 4.3.1 - 4.3.11, 4.4.0 - 4.4.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/tofaS on line 2 array(1) { [12]=> string(6) "foobar" } bool(true) array(1) { [12]=> string(6) "foobar" } bool(true)

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62.14 ms | 465 KiB | 5 Q