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<?php $a = new StdClass(); $b = $a; $b->s = 5; var_dump($a, $b);
based on umj1k
Output for 5.0.0 - 7.1.0
object(stdClass)#1 (1) { ["s"]=> int(5) } object(stdClass)#1 (1) { ["s"]=> int(5) }
Output for 4.3.0 - 4.4.9
object(stdClass)(0) { } object(stdClass)(1) { ["s"]=> int(5) }