How to use array in function to get only value I want

There’s wp_list_pluck() to get certain fields out of arrays or objects:

$object = new StdClass();
$object->foo = 'Hi!';
$object->bar="Yo!";

$array['foo'] = 'Hi!';
$array['bar'] = 'Yo!';

$result_obj = wp_list_pluck( $object, 'foo' );
var_dump( $result_obj );
// Result:
string (3) Hi!

$result_array = wp_list_pluck( $array, 'bar' );
var_dump( $result_array );
// Result:
string (3) Yo!