Get subset of array by specifying keys

Question

Is there a built-in function for:

print_r(array_***([
    'foo' => 1,
    'bar' => 2,
    'baz' => 3,
    'qux' => 4,
], ['foo', 'qux']));

to produce:

Array
(
    [foo] => 1
    [qux] => 4
)

?

@FelixKling I've tried functions from that answer. They both return empty arrays. — Slava Fomin II, Feb 21 '14 at 20:49
Better duplicate: [PHP: How to use array_filter() to filter array keys?](http://stackoverflow.com/q/4260086/218196). — Felix Kling, Feb 21 '14 at 20:53

score 0 · Answer 1 · answered Feb 21 '14 at 20:54

What you're looking for is the array_intersect_key function (http://www.php.net/manual/en/function.array-intersect-key.php).

Running:

var_dump(array_intersect_key(array('foo'=>1,'bar'=>2,'baz'=>3,'qux'=>4),array('foo'=>true,'qux'=>true)));

Should give you:

array(2) { ["foo"]=> int(1) ["qux"]=> int(4) }

1 Answers1