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<?php
function sum_up_to($number) {
$result = 0;
for ($i = 1; $i <= $number; $i++) {
$result += $i;
}
return $result;
}
function sum_up_recursive($number) {
return ($number) ? ($number + sum_up_recursive($number - 1)) : 0;
}
echo '<p>Regular version = ', sum_up_to(42), "</p>\n";
echo '<p>Recursive version = ', sum_up_recursive(42), "</p>\n";
?>
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