使用PHP农历与公历互相转换类 ,主要实现了由公历计算农历 、由农历转公历等功能,通过这个类可以将单个日期转换公历或农历,同样支持整个月份的转换,即给定一个公历月份计算农历。(注:此类支持的年份范围是 1891年~2100年,如果超出此范围的年份将无法转换。此日期转换类暂时未实现节气和中国节假日。)

默认最小处理年份:1891
默认最大处理年份:2100
类方法:
// 将阳历转换为阴历
$lunar->convertSolarToLunar($year, $month, $date);
返回数组,下标分别对应:0数字形式年份,1文字形式月份,2阴历形式天,3干支,4数字形式月份,5数字形式天,6属相,7闰几月。

// 提供阳历年月,返回本月所有阴历
$lunar->convertSolarMonthToLunar($year, $month);
返回数组,同convertSolarToLunar方法的返回值,下标8为日期。
// 将阴历转换为阳历
$lunar->convertLunarToSolar($year, $month, $date);
返回数组,下标分别对应:0年,1月,2日。

//是否闰年
$lunar->isLeapYear($year);
返回逻辑值,TRUE 或 FALSE。

// 提供阴历年,获取干支纪年
$lunar->getLunarYearName($year);
返回字符串。

// 提供阴历年,获取生肖
$lunar->getYearZodiac($year);
返回字符串。

// 提供阳历年、月,获取阳历月份的天数
$lunar->getSolarMonthDays($year, $month);

// 提供阴历年、月,获取阴历月份的天数
$lunar->getLunarMonthDays($year, $month);

// 提供阴历年,获取阴历每月的天数的数组
$lunar->getLunarMonths($year);

// 提供阴历年,获取阴历年有多少天
$lunar->getLunarYearDays($year);

// 提供阴历年,获取阴历每月累加天数
$lunar->getLunarYearMonths($year);

// 提供阴历年份,获取闰月
$lunar->getLeapMonth($year);

// 提供阴历年、月、日,获取与正月初一相隔的天数
$lunar->getDaysBetweenLunar($year, $month, $date);

// 提供阳历年、月、日、月、日,计算2个阳历日期之间的天数
$lunar->getDaysBetweenSolar($year, $cmonth, $cdate, $dmonth, $ddate);

// 提供阴历年份、天数 距离正月初一的天数计算阴历日期
$lunar->getLunarByBetween($year, $between);
返回数组,同convertSolarToLunar方法的返回值。

// 提供数字、是否为月,返回中文名称
$lunar->getCapitalNum($num, $isMonth);
如参数,(30);则返回三十。(11,1);则返回冬月。

<?php
class Lunar {
	var $MIN_YEAR = 1891;
	var $MAX_YEAR = 2100;
	var $lunarInfo = array(
		array(0,2,9,21936),array(6,1,30,9656),array(0,2,17,9584),array(0,2,6,21168),array(5,1,26,43344),array(0,2,13,59728),
		array(0,2,2,27296),array(3,1,22,44368),array(0,2,10,43856),array(8,1,30,19304),array(0,2,19,19168),array(0,2,8,42352),
		array(5,1,29,21096),array(0,2,16,53856),array(0,2,4,55632),array(4,1,25,27304),array(0,2,13,22176),array(0,2,2,39632),
		array(2,1,22,19176),array(0,2,10,19168),array(6,1,30,42200),array(0,2,18,42192),array(0,2,6,53840),array(5,1,26,54568),
		array(0,2,14,46400),array(0,2,3,54944),array(2,1,23,38608),array(0,2,11,38320),array(7,2,1,18872),array(0,2,20,18800),
		array(0,2,8,42160),array(5,1,28,45656),array(0,2,16,27216),array(0,2,5,27968),array(4,1,24,44456),array(0,2,13,11104),
		array(0,2,2,38256),array(2,1,23,18808),array(0,2,10,18800),array(6,1,30,25776),array(0,2,17,54432),array(0,2,6,59984),
		array(5,1,26,27976),array(0,2,14,23248),array(0,2,4,11104),array(3,1,24,37744),array(0,2,11,37600),array(7,1,31,51560),
		array(0,2,19,51536),array(0,2,8,54432),array(6,1,27,55888),array(0,2,15,46416),array(0,2,5,22176),array(4,1,25,43736),
		array(0,2,13,9680),array(0,2,2,37584),array(2,1,22,51544),array(0,2,10,43344),array(7,1,29,46248),array(0,2,17,27808),
		array(0,2,6,46416),array(5,1,27,21928),array(0,2,14,19872),array(0,2,3,42416),array(3,1,24,21176),array(0,2,12,21168),
		array(8,1,31,43344),array(0,2,18,59728),array(0,2,8,27296),array(6,1,28,44368),array(0,2,15,43856),array(0,2,5,19296),
		array(4,1,25,42352),array(0,2,13,42352),array(0,2,2,21088),array(3,1,21,59696),array(0,2,9,55632),array(7,1,30,23208),
		array(0,2,17,22176),array(0,2,6,38608),array(5,1,27,19176),array(0,2,15,19152),array(0,2,3,42192),array(4,1,23,53864),
		array(0,2,11,53840),array(8,1,31,54568),array(0,2,18,46400),array(0,2,7,46752),array(6,1,28,38608),array(0,2,16,38320),
		array(0,2,5,18864),array(4,1,25,42168),array(0,2,13,42160),array(10,2,2,45656),array(0,2,20,27216),array(0,2,9,27968),
		array(6,1,29,44448),array(0,2,17,43872),array(0,2,6,38256),array(5,1,27,18808),array(0,2,15,18800),array(0,2,4,25776),
		array(3,1,23,27216),array(0,2,10,59984),array(8,1,31,27432),array(0,2,19,23232),array(0,2,7,43872),array(5,1,28,37736),
		array(0,2,16,37600),array(0,2,5,51552),array(4,1,24,54440),array(0,2,12,54432),array(0,2,1,55888),array(2,1,22,23208),
		array(0,2,9,22176),array(7,1,29,43736),array(0,2,18,9680),array(0,2,7,37584),array(5,1,26,51544),array(0,2,14,43344),
		array(0,2,3,46240),array(4,1,23,46416),array(0,2,10,44368),array(9,1,31,21928),array(0,2,19,19360),array(0,2,8,42416),
		array(6,1,28,21176),array(0,2,16,21168),array(0,2,5,43312),array(4,1,25,29864),array(0,2,12,27296),array(0,2,1,44368),
		array(2,1,22,19880),array(0,2,10,19296),array(6,1,29,42352),array(0,2,17,42208),array(0,2,6,53856),array(5,1,26,59696),
		array(0,2,13,54576),array(0,2,3,23200),array(3,1,23,27472),array(0,2,11,38608),array(11,1,31,19176),array(0,2,19,19152),
		array(0,2,8,42192),array(6,1,28,53848),array(0,2,15,53840),array(0,2,4,54560),array(5,1,24,55968),array(0,2,12,46496),
		array(0,2,1,22224),array(2,1,22,19160),array(0,2,10,18864),array(7,1,30,42168),array(0,2,17,42160),array(0,2,6,43600),
		array(5,1,26,46376),array(0,2,14,27936),array(0,2,2,44448),array(3,1,23,21936),array(0,2,11,37744),array(8,2,1,18808),
		array(0,2,19,18800),array(0,2,8,25776),array(6,1,28,27216),array(0,2,15,59984),array(0,2,4,27424),array(4,1,24,43872),
		array(0,2,12,43744),array(0,2,2,37600),array(3,1,21,51568),array(0,2,9,51552),array(7,1,29,54440),array(0,2,17,54432),
		array(0,2,5,55888),array(5,1,26,23208),array(0,2,14,22176),array(0,2,3,42704),array(4,1,23,21224),array(0,2,11,21200),
		array(8,1,31,43352),array(0,2,19,43344),array(0,2,7,46240),array(6,1,27,46416),array(0,2,15,44368),array(0,2,5,21920),
		array(4,1,24,42448),array(0,2,12,42416),array(0,2,2,21168),array(3,1,22,43320),array(0,2,9,26928),array(7,1,29,29336),
		array(0,2,17,27296),array(0,2,6,44368),array(5,1,26,19880),array(0,2,14,19296),array(0,2,3,42352),array(4,1,24,21104),
		array(0,2,10,53856),array(8,1,30,59696),array(0,2,18,54560),array(0,2,7,55968),array(6,1,27,27472),array(0,2,15,22224),
		array(0,2,5,19168),array(4,1,25,42216),array(0,2,12,42192),array(0,2,1,53584),array(2,1,21,55592),array(0,2,9,54560)
	);
	/**
	 * 将阳历转换为阴历
	 * @param year 公历-年
	 * @param month 公历-月
	 * @param date 公历-日
	 */
	function convertSolarToLunar($year,$month,$date){
		//debugger;
		$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
		if($year==$this->MIN_YEAR&&$month<=2&&$date<=9){
			return array(1891,'正月','初一','辛卯',1,1,'兔');
		}
	//	return $this->getLunarByBetween($year,$this->getDaysBetweenSolar($year,$month,$date,$yearData[1],$yearData[2]));

		$lunarTime = $this->getLunarByBetween($year, $this->getDaysBetweenSolar($year, $month, $date, $yearData[1], $yearData[2]));
		$yearData = $this->lunarInfo[$lunarTime[0]-$this->MIN_YEAR];

		if ($yearData[0] != 0) {
			$days = $this->getLunarMonthDays($lunarTime[0], $yearData[0]+1);
			$resTime = mktime(1, 1, 1, $lunarTime[4], $lunarTime[5], $lunarTime[0]);
			$resTime = strtotime("-{$days}day", $resTime);
			$lunarTime[0] = date('Y',$resTime);
			$lunarTime[4] = date('n',$resTime);
			$lunarTime[5] = date('d',$resTime);
		}

		return $lunarTime;
	}

	function convertSolarMonthToLunar($year,$month) {
		$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
		if($year==$this->MIN_YEAR&&$month<=2&&$date<=9){
			return array(1891,'正月','初一','辛卯',1,1,'兔');
		}
		$month_days_ary = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
		$dd = $month_days_ary[$month];
		if($this->isLeapYear($year) && $month == 2) $dd++;
		$lunar_ary = array();
		for ($i = 1; $i < $dd; $i++) {
			$array = $this->getLunarByBetween($year,$this->getDaysBetweenSolar($year, $month, $i, $yearData[1], $yearData[2]));
			$array[] = $year . '-' . $month . '-' . $i;
			$lunar_ary[$i] = $array;
		}
		return $lunar_ary;
	}
	/**
	 * 将阴历转换为阳历
	 * @param year 阴历-年
	 * @param month 阴历-月,闰月处理:例如如果当年闰五月,那么第二个五月就传六月,相当于阴历有13个月,只是有的时候第13个月的天数为0
	 * @param date 阴历-日
	 */
	function convertLunarToSolar($year,$month,$date){
		$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
		$between = $this->getDaysBetweenLunar($year,$month,$date);

		// 2012-09-20 修订转换阳历问题
		$monthBetween = 0;

		if ($yearData[0] != 0 && $yearData[0] < $month) {
			// 获取闰月天数

			$days = $this->getLunarMonthDays($year, $yearData[0]+1);
			// 换算成秒
			$monthBetween = $days*24*60*60;
		}

		$res = mktime(0,0,0,$yearData[1],$yearData[2],$year);
		$res = date('Y-m-d', $res+$between*24*60*60+$monthBetween);
		$day    = explode('-', $res);
		$year    = $day[0];
		$month= $day[1];
		$day    = $day[2];
		return array($year, $month, $day);
	}
	/**
	 * 判断是否是闰年
	 * @param year
	 */
	function isLeapYear($year){
		return (($year%4==0 && $year%100 !=0) || ($year%400==0));
	}
	/**
	 * 获取干支纪年
	 * @param year
	 */
	function getLunarYearName($year){
		$sky = array('庚','辛','壬','癸','甲','乙','丙','丁','戊','己');
		$earth = array('申','酉','戌','亥','子','丑','寅','卯','辰','巳','午','未');
		$year = $year.'';
		return $sky[$year{3}].$earth[$year%12];
	}
	/**
	 * 根据阴历年获取生肖
	 * @param year 阴历年
	 */
	function getYearZodiac($year){
		$zodiac = array('猴','鸡','狗','猪','鼠','牛','虎','兔','龙','蛇','马','羊');
		return $zodiac[$year%12];
	}
	/**
	 * 获取阳历月份的天数
	 * @param year 阳历-年
	 * @param month 阳历-月
	 */
	function getSolarMonthDays($year,$month){
		$monthHash = array('1'=>31,'2'=>$this->isLeapYear($year)?29:28,'3'=>31,'4'=>30,'5'=>31,'6'=>30,'7'=>31,'8'=>31,'9'=>30,'10'=>31,'11'=>30,'12'=>31);
		return $monthHash["$month"];
	}
	/**
	 * 获取阴历月份的天数
	 * @param year 阴历-年
	 * @param month 阴历-月,从一月开始
	 */
	function getLunarMonthDays($year,$month){
		$monthData = $this->getLunarMonths($year);
		return $monthData[$month-1];
	}
	/**
	 * 获取阴历每月的天数的数组
	 * @param year
	 */
	function getLunarMonths($year){
		$yearData = $this->lunarInfo[$year - $this->MIN_YEAR];
		$leapMonth = $yearData[0];
		$bit = decbin($yearData[3]);
		for ($i = 0; $i < strlen($bit);$i ++) {
			$bitArray[$i] = substr($bit, $i, 1);
		}
		for($k=0,$klen=16-count($bitArray);$k<$klen;$k++){
			array_unshift($bitArray, '0');
		}
		$bitArray = array_slice($bitArray,0,($leapMonth==0?12:13));
		for($i=0; $i<count($bitArray); $i++){
			$bitArray[$i] = $bitArray[$i] + 29;
		}
		return $bitArray;
	}
	/**
	 * 获取农历每年的天数
	 * @param year 农历年份
	 */
	function getLunarYearDays($year){
		$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
		$monthArray = $this->getLunarYearMonths($year);
		$len = count($monthArray);
		return ($monthArray[$len-1]==0?$monthArray[$len-2]:$monthArray[$len-1]);
	}
	function getLunarYearMonths($year){
		//debugger;
		$monthData = $this->getLunarMonths($year);
		$res=array();
		$temp=0;
		$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
		$len = ($yearData[0]==0?12:13);
		for($i=0;$i<$len;$i++){
			$temp=0;
			for($j=0;$j<=$i;$j++){
				$temp+=$monthData[$j];
			}
			array_push($res, $temp);
		}
		return $res;
	}
	/**
	 * 获取闰月
	 * @param year 阴历年份
	 */
	function getLeapMonth($year){
		$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
		return $yearData[0];
	}
	/**
	 * 计算阴历日期与正月初一相隔的天数
	 * @param year
	 * @param month
	 * @param date
	 */
	function getDaysBetweenLunar($year,$month,$date){
		$yearMonth = $this->getLunarMonths($year);
		$res=0;
		for($i=1;$i<$month;$i++){
			$res +=$yearMonth[$i-1];
		}
		$res+=$date-1;
		return $res;
	}
	/**
	 * 计算2个阳历日期之间的天数
	 * @param year 阳历年
	 * @param cmonth
	 * @param cdate
	 * @param dmonth 阴历正月对应的阳历月份
	 * @param ddate 阴历初一对应的阳历天数
	 */
	function getDaysBetweenSolar($year,$cmonth,$cdate,$dmonth,$ddate){
		$a = mktime(0,0,0,$cmonth,$cdate,$year);
		$b = mktime(0,0,0,$dmonth,$ddate,$year);
		return ceil(($a-$b)/24/3600);
	}
	/**
	 * 根据距离正月初一的天数计算阴历日期
	 * @param year 阳历年
	 * @param between 天数
	 */
	function getLunarByBetween($year,$between){
		//debugger;
		$lunarArray = array();
		$yearMonth=array();
		$t=0;
		$e=0;
		$leapMonth=0;
		$m='';
		if($between==0){
			array_push($lunarArray, $year,'正月','初一');
			$t = 1;
			$e = 1;
		}else{
			$year = $between>0? $year : ($year-1);
			$yearMonth = $this->getLunarYearMonths($year);
			$leapMonth = $this->getLeapMonth($year);
			$between = $between>0?$between : ($this->getLunarYearDays($year)+$between);
			for($i=0;$i<13;$i++){
				if($between==$yearMonth[$i]){
					$t=$i+2;
					$e=1;
					break;
				}else if($between<$yearMonth[$i]){
					$t=$i+1;
					$e=$between-(empty($yearMonth[$i-1])?0:$yearMonth[$i-1])+1;
					break;
				}
			}
			$m = ($leapMonth!=0&&$t==$leapMonth+1)?('闰'.$this->getCapitalNum($t- 1,true)):$this->getCapitalNum(($leapMonth!=0&&$leapMonth+1<$t?($t-1):$t),true);
			array_push($lunarArray,$year,$m,$this->getCapitalNum($e,false));
		}
		array_push($lunarArray,$this->getLunarYearName($year));// 天干地支
		array_push($lunarArray,$t,$e);
		array_push($lunarArray,$this->getYearZodiac($year));// 12生肖
		array_push($lunarArray,$leapMonth);// 闰几月
		return $lunarArray;
	}
	/**
	 * 获取数字的阴历叫法
	 * @param num 数字
	 * @param isMonth 是否是月份的数字
	 */
	function getCapitalNum($num,$isMonth){
		$num = intval($num);
		$isMonth = !empty($isMonth) ? intval($isMonth) : FALSE;
		$dateHash=array('0'=>'','1'=>'一','2'=>'二','3'=>'三','4'=>'四','5'=>'五','6'=>'六','7'=>'七','8'=>'八','9'=>'九','10'=>'十 ');
		$monthHash=array('0'=>'','1'=>'正月','2'=>'二月','3'=>'三月','4'=>'四月','5'=>'五月','6'=>'六月',
			'7'=>'七月','8'=>'八月','9'=>'九月','10'=>'十月','11'=>'冬月','12'=>'腊月');
		$res='';
		if($isMonth){
			$res = $monthHash[$num];
		}else{
			if($num<=10){
				$res = '初'.$dateHash[$num];
			}else if($num>10&&$num<20){
				$res = '十'.$dateHash[$num-10];
			}else if($num==20){
				$res = "二十";
			}else if($num>20&&$num<30){
				$res = "廿".$dateHash[$num-20];
			}else if($num==30){
				$res = "三十";
			}
		}
		return $res;
	}
}
?>

源代码引自:开源中国社区:阴历-农历-转换类 http://www.oschina.net/code/snippet_167936_8333
源码有改动:类阴历转换阳历时存在闰月问题,而少加一月,同理反转换时也需要减一月。
未进行全面测试,在原有测试上,某些年份会转换错误,误差为1天。暂没有解决方法。

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