array_key_exists($key, $array) vs !empty($array[$key])

Question

I\'ve seen a lot of people do the former, is there any performance benefit doing one vs the other? Or is it just an eye candy? I personally use the latter every time as it i

Answer 1

$array = array(
    'foo' => null
);

echo (int)!empty($array['foo']); // 0
echo (int)array_key_exists('foo', $array); // 1