Get certain elements of an array by its key

Question

I'm sure there's a function for this:

What I have:

$myArray = array( 'foo' => 123, 'bar' => 456, 'lou' => 789, 'wuh' => 'xyz' );
$iNeed = array( 'foo', 'lou' );

How can I get the key value pairs that $iNeed:

$output = super_magic_function( $iNeed, $myArray );
// output should be array( 'foo' => 123, 'lou' => 789 );

How is that super_magic_function called (native php if possible)

Why don't you try something, and then if it does not work and you can't figure out why, we find that for you — Henk Jansen
– Henk Jansen, Commented Nov 28, 2013 at 14:50
@HenkJansen I've tried with ´array_intersect´ but got an empty array — Xaver
– Xaver, Commented Nov 28, 2013 at 14:52
@AmazingDreams array_combines parameters must have equal number of elements — Xaver
– Xaver, Commented Nov 28, 2013 at 15:00

Amal · Accepted Answer · 2013-11-28 14:57:43Z

6

$output = array_intersect_key($myArray, array_flip($iNeed));

If you need it as a function:

function super_magic_function($array, $required) {
    return array_intersect_key($array, array_flip($required));
}

Output:

Array
(
    [foo] => 123
    [lou] => 789
)

answered Nov 28, 2013 at 14:51

Amal

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3 Comments

Genius! That's what I'm searching for

Wow - the demo is the icing on the cake!

Haha. I'm glad to have been of help. Cheers :)