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run code in 150+ php & hhvm versions
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<?php $a=array(1,2,3); $b=&$a; $b[]='x'; print_r($a); print_r($b);
Output for 4.3.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => x ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => x )