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run code in 150+ php & hhvm versions
Bugs & Features
<?php $obj1 = new stdClass; $obj1->{'123'} = '456'; var_dump($obj1, $obj1->{'123'}, $obj1->{123}); $obj2 = (object)array('123' => '456'); var_dump($obj2, $obj2->{'123'}, $obj1->{123});
based on 5RuEF
Output for 5.2.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["123"]=> string(3) "456" } string(3) "456" string(3) "456" Notice: Undefined property: stdClass::$123 in /in/RPJXH on line 8 object(stdClass)#2 (1) { [123]=> string(3) "456" } NULL string(3) "456"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.5
object(stdClass)#1 (1) { ["123"]=> string(3) "456" } string(3) "456" string(3) "456" Notice: Undefined property: stdClass::$123 in /in/RPJXH on line 8 object(stdClass)#2 (1) { [123]=> string(3) "456" } NULL string(3) "456"
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/RPJXH on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.