php：自定义的格式化时间方法

如：时间刚好是5分钟前，则对应的时间戳就会被格式化为5分钟前，不多说了，直接贴上代码：

   /**     * 格式化时间     * @param integer $timestamp  时间戳     * @param string $format  dt=日期时间 d=日期 t=时间 u=个性化 其他=自定义     * @param integer $timeoffset  时区值     * @param string $custom_format 自定义时间格式     * @return string     */    public function dgmdate( $timestamp, $format = 'dt', $timeoffset = '9999', $custom_format = '' ) {        $return = '';        $now = time();        $day_format = 'Y-n-j';        $time_format = 'H:i:s';        $date_format = $day_format . ' ' . $time_format;        $offset = 8; //这里默认是东八区，也就是北京时间        $lang = array(            'before' => '前',            'day' => '天',            'yday' => '昨天',            'byday' => '前天',            'hour' => '小时',            'half' => '半',            'min' => '分钟',            'sec' => '秒',            'now' => '刚刚',        );        $timeoffset = $timeoffset == 9999 ? $offset : $timeoffset;        $timestamp += $timeoffset * 3600;        switch ( $format ) {            case 'dt':                $format = $date_format;                break;            case 'd':                $format = $day_format;                break;            case 't':                $format = $time_format;                break;        }        if ( $format == 'u' ) {            $todaytimestamp = $now - ($now + $timeoffset * 3600) % 86400 + $timeoffset * 3600;            $s = gmdate( empty( $custom_format ) ? $date_format : $custom_format, $timestamp );            $time = $now + $timeoffset * 3600 - $timestamp;            if ( $timestamp >= $todaytimestamp ) {                if ( $time > 3600 ) {                    $return = '' . intval( $time / 3600 ) . $lang['hour'] . $lang['before'] . '';                } elseif ( $time > 1800 ) {                    $return = '' . $lang['half'] . $lang['hour'] . $lang['before'] . '';                } elseif ( $time > 60 ) {                    $return = '' . intval( $time / 60 ) . $lang['min'] . $lang['before'] . '';                } elseif ( $time > 0 ) {                    $return = '' . $time . $lang['sec'] . $lang['before'] . '';                } elseif ( $time == 0 ) {                    $return = '' . $lang['now'] . '';                } else {                    $return = $s;                }            } elseif ( ($days = intval( ($todaytimestamp - $timestamp) / 86400 )) >= 0 && $days ' . $lang['yday'] . gmdate( $time_format, $timestamp ) . '';                } elseif ( $days == 1 ) {                    $return = '' . $lang['byday'] . gmdate( $time_format, $timestamp ) . '';                } else {                    $return = '' . ($days + 1) . $lang['day'] . $lang['before'] . '';                }            } else {                $return = $s;            }        } else {            $return = gmdate( $format, $timestamp );        }        return $return;    }