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])); 
  } 
  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); 
    $res=mktime(0,0,0,$yearData[1],$yearData[2],$year); 
    $res=date('Y-m-d',$res+$between*24*60*60); 
    $day=explode('-',$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){ 
    $isMonth=$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; 
  } 
}


用法：

$lunar=new Lunar();
$month=$lunar->convertSolarToLunar(2013,07,08);//将阳历转换为阴历 
echo '<pre>'; 
print_r($month);


打印结果如下：
Array
(
    [0] => 2013
    [1] => 五月
    [2] => 三十
    [3] => 癸巳
    [4] => 5
    [5] => 30
    [6] => 蛇
    [7] => 0
)