six / solution 6.4

<?php

$s = date("s");
$series = [];
$sum = 0;
for ($i = 1; $i <= $s; $i++) {
    $series[] = "1/" . $i;
    $sum += 1 / $i;
}
print_r(implode(" + ", $series) . " ≈ " . $sum);