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<?php $a = new stdClass; $a->a = new stdClass; $a->a->a = new stdClass; $a->a->a->a = 'a'; $a = [ 'a' => [ 'a' => [ 'a' => 'a' ] ] ]; $b = & $a['a']['a']; var_dump($b); var_dump($b['a'] = 'c'); var_dump($a);

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