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run code in 150+ php & hhvm versions
Bugs & Features
<?php $obj = new stdClass; $obj->{'123'} = "foo"; echo $obj->{'123'},"\n"; var_dump($obj); $arr = (array) $obj; var_dump($arr); echo $arr['123']; // PHP4: "foo"
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
foo object(stdClass)#1 (1) { ["123"]=> string(3) "foo" } array(1) { ["123"]=> string(3) "foo" } Notice: Undefined offset: 123 in /in/qkh2T on line 8
Output for 5.3.0 - 5.3.29, hhvm-3.12.0
foo object(stdClass)#1 (1) { ["123"]=> string(3) "foo" } array(1) { ["123"]=> string(3) "foo" } Notice: Undefined index: 123 in /in/qkh2T on line 8
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.2.17
foo object(stdClass)#1 (1) { ["123"]=> string(3) "foo" } array(1) { ["123"]=> string(3) "foo" } Notice: Undefined index: 123 in /in/qkh2T on line 8
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/qkh2T on line 8
Process exited with code 255.
Output for 4.3.0 - 4.4.9
foo object(stdClass)(1) { [123]=> string(3) "foo" } array(1) { [123]=> string(3) "foo" } foo