Question

I need some help w/ range function:

Code: range(1,4)

Output:

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

---

How can I get an output like:

Array
(
    [01] => 01
    [02] => 02
    [03] => 03
    [04] => 04
)

Answer 1

For the values, you could use a string instead. There is an example using array_map to help you, and also with sprintf to pad zeros:

<?php
$a = array_map(function($n) { return sprintf('%02d', $n); }, range(1, 4));
print_r($a);
?>

In older PHP versions you may need this:

<?php
function f($n) { return sprintf('%02d', $n); }
$a = array_map(f, range(1, 4));
print_r($a);
?>

Output:
Array

(
    [0] => 01
    [1] => 02
    [2] => 03
    [3] => 04
)

Demo: http://codepad.org/Ovx1VQDM

But Array keys are intended for use in your code only, even though you could use strings as keys, it would be better to stay with integers.