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