Invalid hex returned from dechex();

Hello,

I'm trying to find a valid hex notation return that consists of 2, 4,
6, 8... digits of hexadecimal, numbers, simply from a loop.

<?php

for ($i = '0'; $i <= '10000'; $i++) {
echo dechex($i) . "\n";
}

?>

This should return valid hex notation, however, this is the return...

0
1
2
3
4
5
6
7
8
9
a
b
c
d
e
f
10
11
12
....
100
101
102
....

Can anyone point a proper procedure for returning a valid notion for
hex, for such a simple task, and why the php developers are sitting on
their a** about this one.

Source: http://en.wikipedia.org/wiki/Hexadecimal

Thankyou.

.

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