2 array same keys and value check if value from first array is here

I have 2 arrays merge to one array now i want to check if value 1 in array $s then display value in for each only from $s array but in above example display the value from $b and $b how can i get the value from $s only by using if() sorry about my English :(

$s = array(1,2,3,4,5);
$b = array(1,2,3,4);
$one = array_merge($s,$b);
foreach($one as $k=>$v){
 if(in_array(1,$s)){
     // display only value from array $s
     echo $v;
   }
 if(in_array(1,$b)){
     // display only value from array $b
     echo $b;
   }
}