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<?php $obj = new stdClass(); $obj->{123} = "foo"; $arr = (array)$obj; var_dump($arr); var_dump($arr['123'], $arr[123]); $obj2 = (object)$arr; var_dump($obj2->{123});
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 - 8.2.18, 8.3.0 - 8.3.6
array(1) { [123]=> string(3) "foo" } string(3) "foo" string(3) "foo" string(3) "foo"
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25
array(1) { ["123"]=> string(3) "foo" } Notice: Undefined offset: 123 in /in/4jBF5 on line 9 Notice: Undefined offset: 123 in /in/4jBF5 on line 9 NULL NULL string(3) "foo"
Output for 5.3.0 - 5.3.29
array(1) { ["123"]=> string(3) "foo" } Notice: Undefined index: 123 in /in/4jBF5 on line 9 Notice: Undefined offset: 123 in /in/4jBF5 on line 9 NULL NULL string(3) "foo"
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
array(1) { ["123"]=> string(3) "foo" } Notice: Undefined index: 123 in /in/4jBF5 on line 9 Notice: Undefined offset: 123 in /in/4jBF5 on line 9 NULL NULL string(3) "foo"
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Property name must be a string in /in/4jBF5 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.
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226.22 ms | 401 KiB | 327 Q