Re-sorting array via array keys?

I have two arrays, $country and $redirect with each entry corresponding with it's exact counterpart e.g. $redirect[1] and $country[1].

After un-setting values throughout the array, I might be left with, for example, an array where only $var[4] and $var[2] are set. I want to re-assign array keys from 0 upwards, so that $var[2] would have it's key re-assigned to $var[0] and $var[4] re-assigned to $var[1].

Essentially the sort() function, but sorting by current array key, as oppose to the numeric/string value of an array.

Is this possible?

Any answers or advice would be greatly appreciated ;)!

UPDATE:

I've attempted to use both ksort() and array_values(), however I'm not sure they're really what I need, as I plan on using the size_of() function.

My code:

$var = array(2 => "value_1", 4 => "value_2", 6 => "value_3");
ksort($var);
for($i = 0, $size = sizeof($var); $i < $size; $i++) {
    $var[$i] = "foo";
}
var_dump($var);

Returns:

array(5) { [2]=> string(3) "foo" [4]=> string(7) "value_2" [6]=> string(7) "value_3" [0]=> string(3) "foo" [1]=> string(3) "foo" }

Any addi开发者_如何学Ctional ideas/answers on how I could get this to work would be greatly appreciated!

Use array_values() (returns "sorted" array):

$var = array(2 => "value_1", 4 => "value_2", 6 => "value_3");
$var = array_values($var);
for($i = 0, $size = sizeof($var); $i < $size; $i++) {
    $var[$i] = "foo";
}
var_dump($var);