code:-
 
<?php
function array_union($x, $y)
   { 
      $aunion=  array_merge(
            array_intersect($x, $y),
            array_diff($x, $y),     
            array_diff($y, $x)      
        );
        return $aunion;
   }
$p = array(1, 2);
$r = array(2, 3,4);
print_r(array_union($p, $r));
?>

output:-

array([0]=>1[1]=>2 [2]=>3 [3]=>4)

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If you have any doubts, Please let me know
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