如何在php中限制一个关联数组？

Question

I have an associative array like follow

Array ( [1274] => 2 [2700] => 3 [2701] => 4 [2702] => 2 [2699] => 2 [2698] => 1 [2694] => 1......)

what i want is to take the first 10 elements from this array. I Used array_slice. But then the new array will be like

Array ( [0] => 2 [1] => 3 [2] => 4 [3] => 2 [4] => 2 [5] => 1 [6] => 1.....)

It limits the array but array keys have been removed. How can i get the keys as well? Thanks for your advices.

Answer 1

Well, you could do something like this:

$slice = array_intersect_key($whole,array_flip(array_slice(array_keys($whole),0,10)));

If you want something more readable, this'll work:

$keys = array_keys($whole);
$slice = Array();
$firstkeys = array_slice($keys,0,10);
foreach($firstkeys as $key) $slice[$key] = $whole[$key];