How to match the key of an associated array with the value of another simple array in PHP?

Question

PHP

There are two arrays, for example:

$alpha = Array('ONE' => '70', 'TWO' => '80');
$beta = Array('ONE','THREE');

It is necessary that if the Beta array has a value equal to the Alpha array key, the Alpha value for this key is displayed. Those. in this case, 70 was displayed. There can and should be several values ​​at the output

Answer 1

$alpha = array('ONE' => '70', 'TWO' => '80');
$beta = array('ONE','THREE');
$result = array_intersect_key($alpha, array_flip($beta));
var_dump($result);

as a result:

array(1) {
  ["ONE"]=>
  string(2) "70"
}