php实现求相对时间函数_PHP教程

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function relativeTime($time = false, $limit = 86400, $format = 'g:i A M jS') {

if (empty($time) || (!is_string($time) & amp; & amp;

!is_numeric($time))) $time = time();

elseif (is_string($time)) $time = strtotime($time);

$now = time();

$relative = '';

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

elseif ($time > $now) $relative = 'in the future';

else {

$diff = $now - $time;

if ($diff >= $limit) $relative = date($format, $time);

elseif ($diff < 60) {

$relative = 'less than one minute ago';

} elseif (($minutes = ceil($diff / 60)) < 60) {

$relative = $minutes . ' minute' . (((int)$minutes === 1) ? '' : 's') . ' ago';

} else {

$hours = ceil($diff / 3600);

$relative = 'about ' . $hours . ' hour' . (((int)$hours === 1) ? '' : 's') . ' ago';

}

}

return $relative;

}