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<?php $a = new stdClass; $a->id = 123; var_dump($a); var_dump(isset($a->identifiers));
Output for 5.0.0 - 7.2.0
object(stdClass)#1 (1) { ["id"]=> int(123) } bool(false)
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { ["id"]=> int(123) } bool(false)