相対時間関数

functionrelativeTime($time = false, $limit = 86400, $format = 'g:i A M jS') {
if (empty($time) || (!is_string($time) ) && !is_numeric($time))) $time = time();
elseif (is_string($time)) $time = strtotime($time);

$now = time();
$relative = '';

if ($time === $now) $relative = '現在';
elseif ($time > $now) $relative = '将来';
else {
$diff = $今 - $time;

if ($diff >= $limit) $relative = date($format, $time);
elseif ($diff $relative = '1 分前未満' ;
} elseif (($ minutes = ceil($diff/60)) $relative = $ minutes.'分'.(((int)$分 === 1) ? '' : 's').' ago';
} else {
$hours = ceil($diff/3600);
$relative = '約 '.$hours.'時間'.(((int)$時間 === 1) ? '' : 's').'前';
}
}

return $relative;
}