Populating an array inside of a for loop using PHP

Populating an array from inside a loop is very easy:

file: x.php
//====================================================
<?php

$i=10;

for ($x=0;$x<=$i;$x++) {
$testarray[]=$x;
}

foreach ($testarray as $value) {
echo "$value<BR>";
}
?>
//====================================================

#>php x.php
0
1
2
3
4
5
6
7
8
9
10
#>