The most efficicient way to pick key,value from a large array

Use array_intersect_key with array_flip.

$pending_pick_key1 = [uid, username];
array_intersect_key($origin_array, array_flip( $pending_pick_key1));

Now, we have a large array, contains user profile.
[uid, username, password, email, qq, msn, skype, address, zipcode,
telphone, mobile.......]

We need to pick information from this big array, and we know the key
we want to pick.
What's the efficient way ? Is there any function like

$pending_pick_key1 = [uid, username];
array_pick($origin_array, $pending_pick_key1); //return array
contains [uid, username]

$pending_pick_key2 = [username, password];
array_pick($origin_array, $pending_pick_key2); //return array contains
[username, password]

we current using array_filter and pass function into it to do this job.
But it's not fast as we test.

Any other ideas beside array_filter?

Or we have to implement an php extension to do this job ?

Sorry for trouble you. need your help.

Appreciate your time.

Netroby