get array elements which have key in second array in php

Question

I need only array elements which have their keys in values of second array, with the fastest script.

$array_1 = array(
    'ana' => 'are',
    'du'  => 34,
    'bopq'=> "Ana are mere mereu",
    13    => "OK"
);

$array_2 = array('du', 13);

$expected_array = array(
    'du' => 34,
    13   => "OK"
);

There is faster solution than:

$expected_array = array_intersect($array_1, array_combine($array_2, $array_2);

?

Answer 1

Array_intersect_key is what you are looking for.

$array_1 = array(
    'ana' => 'are',
    'du'  => 34,
    'bopq'=> "Ana are mere mereu",
    13    => "OK"
);

$array_2 = array('du', 13);

$result = array_intersect_key($array_1, array_flip($array_2));

https://3v4l.org/P6jkq