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run code in 200+ php & hhvm versions
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<?php $a=array('a'=>array(1,2,3), 'b'=>array(4,5,6), 'c'=>array(7,8,9)); $_a=&$a['a']; $_a['x']='aaaaaaa'; print_r($a); $_a=&$a['b']; $_a['x']='bbbbbb'; print_r($a);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
Array ( [a] => Array ( [0] => 1 [1] => 2 [2] => 3 [x] => aaaaaaa ) [b] => Array ( [0] => 4 [1] => 5 [2] => 6 ) [c] => Array ( [0] => 7 [1] => 8 [2] => 9 ) ) Array ( [a] => Array ( [0] => 1 [1] => 2 [2] => 3 [x] => aaaaaaa ) [b] => Array ( [0] => 4 [1] => 5 [2] => 6 [x] => bbbbbb ) [c] => Array ( [0] => 7 [1] => 8 [2] => 9 ) )