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<?php $obj = new stdClass; $obj->{'123a'} = "foo"; $arr = (array) $obj; var_dump($arr["123a"]); // Undefined offset: 123
based on KQFRk
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.2.0
string(3) "foo"
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/UGCgt on line 5
Process exited with code 255.