<?php
$alphabet = "abcdefghijklmnopqrstuvwxyz";
for($first = 0; $first <= 25; $first++) {
for($second = 0; $second <= 25; $second++) {
for($third = 0; $third <= 25; $third++) {
echo $alphabet{$first} . $alphabet{$second} . $alphabet{$third} . "<br>";
}
}
}
?>