～略～
    // BEGIN: borrowed and modified from http://de3.php.net/manual/en/function.filesize.php
    function time_translate($seconds) {
        $array = array(
            '年' => 60 * 60 * 24 * 365.25,
            '月' => 60 * 60 * 24 * 30.5,
            '週間' => 60 * 60 * 24 * 7,
            '日' => 60 * 60 * 24,
            '時間' => 60 * 60,
            '分' => 60,
            '秒' => 1,
        );
        foreach ($array as $name=>$secs) {
            if ($seconds < $secs && $secs != end($array)) continue;
            $resv = floor($seconds / $secs);
            $res .= ' ' . $resv . $name;
            $seconds -= $resv*$secs;
        }
        return trim($res);
    }
    // END: borrowed and modified from http://de3.php.net/manual/en/function.filesize.php
～略～