php实现求相对时间函数

本文实例讲述了php实现求相对时间函数。分享给大家供大家参考。具体实现方法如下：

    <?php
    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;
    }

希望本文所述对大家的php程序设计有所帮助。