PHP获取指定时间段之间的 年,月,天,时,分,秒

class utils {
     /**
	 * format mysql datetime (yyyy-mm-dd hh:mm:ss) 把mysql中查找出来的数据格式转换成时间秒数
	 * @param string $datetime
	 */
	public function fmdatetime($datetime) {
	  $year = substr($datetime,0,4);
	  $month = substr($datetime,5,2);
	  $day = substr($datetime,8,2);
	  $hour = substr($datetime,11,2);
	  $min = substr($datetime,14,2);
	  $sec = substr($datetime,17,2);
	  return mktime($hour,$min,$sec,$month,$day,0+$year);
	}
	/**
	 * 
	 * 根据俩个时间获取俩个时间的 包含的 年，月数，天数，小时，分钟，秒
	 * @param string $start
	 * @param string $end
	 * @return arrayobject 
	 */
	 private function diffdatetime($datestart,$dateend){
		$rs = array();
		
		$syear = substr($datestart,0,4);
		$eyear = substr($dateend,0,4);
		
		$smonth = substr($datestart,5,2);
		$emonth = substr($dateend,5,2);
		
		$sday = substr($datestart,8,2);
		$eday = substr($dateend,8,2);
		
		$starttime = $this->fmdatetime($datestart);
		$endtime = $this->fmdatetime($dateend);
		$dis = $endtime-$starttime;//得到俩个时间的秒数
		$d = ceil($dis/(24*60*60));//得到天数
		$rs['day'] = $d;//天数
		$rs['hour'] = ceil($dis/(60*60));//小时
		$rs['minute'] = ceil($dis/60);//分钟
		$rs['second'] = $dis;//秒数
		$rs['week'] = ceil($d/7);//周
		
		$tem = ($eyear-$syear)*12;//月份
		$tem1 = $eyear-$syear;//年
		if($emonth-$smonth<0){//月份相减为负
			$tem +=($emonth-$smonth);
		}else if($emonth==$smonth){//月份相同
			if($eday-$sday>=0){
				$tem ++;
				$tem1++;
			}
		}else if($emonth-$smonth>0){//月份相减正负
			$tem1++;
			if($eday-$sday>=0){//且日期相减为正数
				$tem +=($emonth-$smonth)+1;
			}else{
				$tem +=($emonth-$smonth);
			}
		}
		$rs['month'] = $tem;
		$rs['year'] = $tem1;
		
		return $rs;
	}
}