# create a hash representing @array2
my %hash;
$hash{$_} = undef foreach (@array2);

# grep only leaves what evaluates to true.
# if an element of array1 is not in array2, it is
# left in place
@array1 = grep { not exists $hash{$_} } @array1;

##</code><code>##

if($array1[$search] eq $array[$search2]){
    splice(@array1,$search,1); # remove 1 element from index $search in @array1
    $search--; # the next element is already at $search. decrement so when it's incremented we'll have the same value.
}