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<?php $a=array(0=>'x',3=>'y'); $b=array(0=>'s',1=>'k',2=>'m',3=>'z'); print_r($b+$a); ?>
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => s [1] => k [2] => m [3] => z )