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<?php $obj = (object)array('123a' => '456'); var_dump($obj); if ( isset($obj->{'123a'})) { echo $obj->{'123a'},"\n"; }
based on JiVtF
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["123a"]=> string(3) "456" } 456
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { ["123a"]=> string(3) "456" } 456