Checking to see if one array's elements are in another array in PHP

So you have 2 arrays:

$a = array("a", "b", "c", "d");
$b = array("x", "y", "z", "b", "o");

And you want to check if one of the array a's item are in the b array, here is how:

if( !empty(array_intersect($a, $b))) {
      echo "Gotcha!";
};