array_rand()

as we know array_rand outputs the keys,, how to get value from it of the random element

i tried this:-

<?php

$n = array("lions", "tigers", "bears", "kittens");

var_dump(array_rand($n));

?>

and also how to get values, if  i pass the 2nd parameter i.e. number of random keys we need,, because the array returned by it contain keys as their values