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run code in 150+ php & hhvm versions
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<?php $i = new stdClass(); $i->{1234} = "test"; $i = (array) $i; var_dump($i); foreach ($i as $key => $value) { var_dump($key, $value, $i[$key]); }
Output for 5.5.0 - 5.6.28, 7.0.0 - 7.1.0
array(1) { ["1234"]=> string(4) "test" } Notice: Undefined offset: 1234 in /in/7p74j on line 8 string(4) "1234" string(4) "test" NULL
Output for hhvm-3.10.0 - 3.12.0
array(1) { ["1234"]=> string(4) "test" } Notice: Undefined index: 1234 in /in/7p74j on line 8 string(4) "1234" string(4) "test" NULL
Output for 5.0.0 - 5.4.45
array(1) { ["1234"]=> string(4) "test" } string(4) "1234" string(4) "test" NULL
Output for 4.3.3 - 4.4.9
<br /> <b>Fatal error</b>: Property name must be a string in <b>/in/7p74j</b> on line <b>3</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.