php实现用已经过去多长时间的方式显示时间

本文实例讲述了php用已经过去多长时间的方式显示时间的方法。分享给大家供大家参考。具体如下：

这里以一种可读性比较好的方式显示已经过去多长时间，比如：距离现在10秒，距离现在1天等等。

    function time_is_older_than($t, $check_time){
      $t = strtolower($t);
      $time_type = substr(preg_replace('/[^a-z]/', '', $t), 0, 1);
      $val = intval(preg_replace('/[^0-9]/', '', $t));
      $ts = 0;
      // (s)econds, (m)inutes, (d)ays, (y)ears
      if ($time_type == 's'){ $ts = $val; }
      else if ($time_type == 'm'){ $ts = $val * 60; }
      else if ($time_type == 'h'){ $ts = $val * 60 * 60; }
      else if ($time_type == 'd'){ $ts = $val * 60 * 60 * 24; }
      else if ($time_type == 'y'){ $ts = $val * 60 * 60 * 24 * 365; }
      else { die('Unknown time format given!'); }
      if ($check_time < (time()-$ts)){ return true; }
      return false;
    }

    //使用范例：
    // timestamp to test: 
    // (could be from an database or something else)
    $time = 1146722922;
    // long if check:
    if (time_is_older_than('30m', $time)){
      print 'The given timestamp: ' . date('l dS \of F Y h:i:s A',$time);
      print " - is older than 30 minutes<br/>\n";
    }
    else {
      print 'The given timestamp: ' . date('l dS \of F Y h:i:s A',$time);
      print " - is NOT older than 30 minutes<br/>\n";
    }
    // short checks:
    if (time_is_older_than('10s', $time)){ print "Is older than 10 seconds<br/>\n"; }
    if (time_is_older_than('200m', $time)){ print "Is older than 200 minutes<br/>\n"; }
    if (time_is_older_than('2h', $time)){ print "Is older than 2 hours<br/>\n"; }
    if (time_is_older_than('4d', $time)){ print "Is older than 4 days<br/>\n"; }
    if (time_is_older_than('1y', $time)){ print "Is older than one year<br/>\n"; }

希望本文所述对大家的php程序设计有所帮助。