Added function Arr::extract_existing()

[danieliser]

Similar to extract except that it doesnt return keys that arnt set in the first array.

EX..
Arr::filter(
array('a' => 'foo', 'b' => 'bar'),
array('a','c')
);
Returns array('a' => 'foo')
Key b is removed from results altogether.

This is particularly useful for extracting fields from $_POST for Model without leaveing unset values as NULL.
Regular extract in this situation will end up saving value "C" above as NULL even if your only attempting to change "A".

[zeelot]

Did you ever make a redmine ticket for this?

[cs278]

Bit of a mouthful, Underscore calls this pick.

You could rewrite the method to:

array_intersect_key($arr, array_flip($keys))

But this won't work on objects that implement \Traversable and \ArrayAccess, and it'll handle nulls differently.

[enov]

Thanks for this @danieliser. No need for a Redmine ticket anymore, but definitely unit tests :)

[enov]

Also, I think the method name needs to change, but I am not sure.

[acoulton]

This would be really useful - I agree with @enov and @cs278, pick might be a better name.

Though if this were a blank sheet, I'd call this extract and have called the existing method something else, since it adds extra values to the result....

[danieliser]

Agreed, i thought of several names since.
pick, fetch, only, pull.

Glad to see this finally make it into core. Hell glad to see that project isn't dead. Felt like community died shortly after i started using Kohana heavily.

[neo22s]

I like this, missing tests, should be for 4.0.0?