How can I reindex an array with negative integer key values so that item 0,1,2,3,-1 is sorted to -1,0,1,2,3 and then renumbered to 0,1,2,3,4?

Question

Let's say I have this: $arr=[];$arr[0]='second';$arr[-1]='first'; How do I change it to $arr[0=>'first',1=> 'second']This is the best I came up with: $new=[];foreach($arras$key=>$value){$new[$key+1]=$value;}ksort($new); But as with arrays in php, I'd like to know if there's actually one I can use

P粉441076405 · Answer

I can't help but wonder if your goal is just to insert a value at the beginning of the array, maybe you're looking for array_unshift()?

So instead of

$arr[-1] = 'first';

...then sort, you can do this

array_unshift($arr, 'first');

This inserts 'first' at index 0 and moves each existing, numerically indexed item up one in the array.

P粉107991030 · Answer

Use ksort to sort the array, then apply array_values to it. It will re-index keys starting from 0:

$arr = [];
$arr[0] = 'second';
$arr[-1] = 'first';

ksort($arr);
$result = array_values($arr);