im having trouble writing a script that will create an xml file for me

<images>
    <pic>
    <image>photos/1.jpg</image>
    <thumbnail>photos/s1.jpg</thumbnail>
    <caption></caption>
    </pic>
    <pic>
    <image>photos/2.jpg</image>
    <thumbnail>photos/s2.jpg</thumbnail>
    <caption></caption>
    </pic>
</images>

(and it repeats the <pic> to </pic> till end)

i would like a script that writes that for as many images as i want.

it can write it in a text file so i can copy it over

and i would like to be able to add some captions.

How hard would it be to write a script that does this and can someone write it.

im thinking maybe a loop that adds 1 to its variable (that puts the number in the xml code) each time. The loop should go till it gets to 100 if possible.

PHP Code:

<?
   $max = 100;
   for ($i = 1; $i <= $max; $i++): ?>
<pic>
   <image>photos/<?= $i ?>.jpg</image>
   <thumbnail>photos/s<?= $i ?>.jpg</thumbnail>
   <caption><?= $captions[$i] ?></caption>
</pic>
<? endfor ?>

thank you