从具有键作为另一个数组的值的数组值中提取

Question

Better show than tell.

$first = array(
    3=>"Banana", 
    4=>"Apple", 
    6=>"Lemon",
    7=>"Pineapple",
    8=>"Peach"
);

$second = array(4,7,8);

(Please note: the first one is associative array, it can have holes) The result should be

$result = array(
    "Apple", 
    "Pineapple",
    "Peach"
);

Any smart idea? Thank you

Answer 1

Here we are using array_intersect_key, array_flip and array_values. This single liner will be enough.

1. array_values will return values of an array.

2. array_flip will flip array over keys and values.

3. array_intersect_key will return array on the basis of two input array's over intersecting keys.

Try this code snippet here

print_r(
     array_values(
         array_intersect_key(
                  $first, array_flip($second))));