php阳历转农历，2016优化版

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<?php

function nongli($riqi)
{
//优化修改 20160807 FXL 
$nian=date('Y',strtotime($riqi));
$yue=date('m',strtotime($riqi));
$ri=date('d',strtotime($riqi));

  #源码部分原作者：沈潋(S&S Lab) 
  #农历每月的天数 
  $everymonth=array( 
                    0=>array(8,0,0,0,0,0,0,0,0,0,0,0,29,30,7,1), 
                    1=>array(0,29,30,29,29,30,29,30,29,30,30,30,29,0,8,2), 
                    2=>array(0,30,29,30,29,29,30,29,30,29,30,30,30,0,9,3), 
                    3=>array(5,29,30,29,30,29,29,30,29,29,30,30,29,30,10,4), 
                    4=>array(0,30,30,29,30,29,29,30,29,29,30,30,29,0,1,5), 
                    5=>array(0,30,30,29,30,30,29,29,30,29,30,29,30,0,2,6), 
                    6=>array(4,29,30,30,29,30,29,30,29,30,29,30,29,30,3,7), 
                    7=>array(0,29,30,29,30,29,30,30,29,30,29,30,29,0,4,8), 
                    8=>array(0,30,29,29,30,30,29,30,29,30,30,29,30,0,5,9), 
                    9=>array(2,29,30,29,29,30,29,30,29,30,30,30,29,30,6,10), 
                    10=>array(0,29,30,29,29,30,29,30,29,30,30,30,29,0,7,11), 
                    11=>array(6,30,29,30,29,29,30,29,29,30,30,29,30,30,8,12), 
                    12=>array(0,30,29,30,29,29,30,29,29,30,30,29,30,0,9,1), 
                    13=>array(0,30,30,29,30,29,29,30,29,29,30,29,30,0,10,2), 
                    14=>array(5,30,30,29,30,29,30,29,30,29,30,29,29,30,1,3), 
                    15=>array(0,30,29,30,30,29,30,29,30,29,30,29,30,0,2,4), 
                    16=>array(0,29,30,29,30,29,30,30,29,30,29,30,29,0,3,5), 
                    17=>array(2,30,29,29,30,29,30,30,29,30,30,29,30,29,4,6), 
                    18=>array(0,30,29,29,30,29,30,29,30,30,29,30,30,0,5,7), 
                    19=>array(7,29,30,29,29,30,29,29,30,30,29,30,30,30,6,8), 
                    20=>array(0,29,30,29,29,30,29,29,30,30,29,30,30,0,7,9), 
                    21=>array(0,30,29,30,29,29,30,29,29,30,29,30,30,0,8,10), 
                    22=>array(5,30,29,30,30,29,29,30,29,29,30,29,30,30,9,11), 
                    23=>array(0,29,30,30,29,30,29,30,29,29,30,29,30,0,10,12), 
                    24=>array(0,29,30,30,29,30,30,29,30,29,30,29,29,0,1,1), 
                    25=>array(4,30,29,30,29,30,30,29,30,30,29,30,29,30,2,2), 
                    26=>array(0,29,29,30,29,30,29,30,30,29,30,30,29,0,3,3), 
                    27=>array(0,30,29,29,30,29,30,29,30,29,30,30,30,0,4,4), 
                    28=>array(2,29,30,29,29,30,29,29,30,29,30,30,30,30,5,5), 
                    29=>array(0,29,30,29,29,30,29,29,30,29,30,30,30,0,6,6), 
                    30=>array(6,29,30,30,29,29,30,29,29,30,29,30,30,29,7,7), 
                    31=>array(0,30,30,29,30,29,30,29,29,30,29,30,29,0,8,8), 
                    32=>array(0,30,30,30,29,30,29,30,29,29,30,29,30,0,9,9), 
                    33=>array(5,29,30,30,29,30,30,29,30,29,30,29,29,30,10,10), 
                    34=>array(0,29,30,29,30,30,29,30,29,30,30,29,30,0,1,11), 
                    35=>array(0,29,29,30,29,30,29,30,30,29,30,30,29,0,2,12), 
                    36=>array(3,30,29,29,30,29,29,30,30,29,30,30,30,29,3,1), 
                    37=>array(0,30,29,29,30,29,29,30,29,30,30,30,29,0,4,2), 
                    38=>array(7,30,30,29,29,30,29,29,30,29,30,30,29,30,5,3), 
                    39=>array(0,30,30,29,29,30,29,29,30,29,30,29,30,0,6,4), 
                    40=>array(0,30,30,29,30,29,30,29,29,30,29,30,29,0,7,5), 
                    41=>array(6,30,30,29,30,30,29,30,29,29,30,29,30,29,8,6), 
                    42=>array(0,30,29,30,30,29,30,29,30,29,30,29,30,0,9,7), 
                    43=>array(0,29,30,29,30,29,30,30,29,30,29,30,29,0,10,8), 
                    44=>array(4,30,29,30,29,30,29,30,29,30,30,29,30,30,1,9), 
                    45=>array(0,29,29,30,29,29,30,29,30,30,30,29,30,0,2,10), 
                    46=>array(0,30,29,29,30,29,29,30,29,30,30,29,30,0,3,11), 
                    47=>array(2,30,30,29,29,30,29,29,30,29,30,29,30,30,4,12), 
                    48=>array(0,30,29,30,29,30,29,29,30,29,30,29,30,0,5,1), 
                    49=>array(7,30,29,30,30,29,30,29,29,30,29,30,29,30,6,2), 
                    50=>array(0,29,30,30,29,30,30,29,29,30,29,30,29,0,7,3), 
                    51=>array(0,30,29,30,30,29,30,29,30,29,30,29,30,0,8,4), 
                    52=>array(5,29,30,29,30,29,30,29,30,30,29,30,29,30,9,5), 
                    53=>array(0,29,30,29,29,30,30,29,30,30,29,30,29,0,10,6), 
                    54=>array(0,30,29,30,29,29,30,29,30,30,29,30,30,0,1,7), 
                    55=>array(3,29,30,29,30,29,29,30,29,30,29,30,30,30,2,8), 
                    56=>array(0,29,30,29,30,29,29,30,29,30,29,30,30,0,3,9), 
                    57=>array(8,30,29,30,29,30,29,29,30,29,30,29,30,29,4,10), 
                    58=>array(0,30,30,30,29,30,29,29,30,29,30,29,30,0,5,11), 
                    59=>array(0,29,30,30,29,30,29,30,29,30,29,30,29,0,6,12), 
                    60=>array(6,30,29,30,29,30,30,29,30,29,30,29,30,29,7,1), 
                    61=>array(0,30,29,30,29,30,29,30,30,29,30,29,30,0,8,2), 
                    62=>array(0,29,30,29,29,30,29,30,30,29,30,30,29,0,9,3), 
                    63=>array(4,30,29,30,29,29,30,29,30,29,30,30,30,29,10,4), 
                    64=>array(0,30,29,30,29,29,30,29,30,29,30,30,30,0,1,5), 
                    65=>array(0,29,30,29,30,29,29,30,29,29,30,30,29,0,2,6), 
                    66=>array(3,30,30,30,29,30,29,29,30,29,29,30,30,29,3,7), 
                    67=>array(0,30,30,29,30,30,29,29,30,29,30,29,30,0,4,8), 
                    68=>array(7,29,30,29,30,30,29,30,29,30,29,30,29,30,5,9), 
                    69=>array(0,29,30,29,30,29,30,30,29,30,29,30,29,0,6,10), 
                    70=>array(0,30,29,29,30,29,30,30,29,30,30,29,30,0,7,11), 
                    71=>array(5,29,30,29,29,30,29,30,29,30,30,30,29,30,8,12), 
                    72=>array(0,29,30,29,29,30,29,30,29,30,30,29,30,0,9,1), 
                    73=>array(0,30,29,30,29,29,30,29,29,30,30,29,30,0,10,2), 
                    74=>array(4,30,30,29,30,29,29,30,29,29,30,30,29,30,1,3), 
                    75=>array(0,30,30,29,30,29,29,30,29,29,30,29,30,0,2,4), 
                    76=>array(8,30,30,29,30,29,30,29,30,29,29,30,29,30,3,5), 
                    77=>array(0,30,29,30,30,29,30,29,30,29,30,29,29,0,4,6), 
                    78=>array(0,30,29,30,30,29,30,30,29,30,29,30,29,0,5,7), 
                    79=>array(6,30,29,29,30,29,30,30,29,30,30,29,30,29,6,8), 
                    80=>array(0,30,29,29,30,29,30,29,30,30,29,30,30,0,7,9), 
                    81=>array(0,29,30,29,29,30,29,29,30,30,29,30,30,0,8,10), 
                    82=>array(4,30,29,30,29,29,30,29,29,30,29,30,30,30,9,11), 
                    83=>array(0,30,29,30,29,29,30,29,29,30,29,30,30,0,10,12), 
                    84=>array(10,30,29,30,30,29,29,30,29,29,30,29,30,30,1,1), 
                    85=>array(0,29,30,30,29,30,29,30,29,29,30,29,30,0,2,2), 
                    86=>array(0,29,30,30,29,30,30,29,30,29,30,29,29,0,3,3), 
                    87=>array(6,30,29,30,29,30,30,29,30,30,29,30,29,29,4,4), 
                    88=>array(0,30,29,30,29,30,29,30,30,29,30,30,29,0,5,5), 
                    89=>array(0,30,29,29,30,29,29,30,30,29,30,30,30,0,6,6), 
                    90=>array(5,29,30,29,29,30,29,29,30,29,30,30,30,30,7,7), 
                    91=>array(0,29,30,29,29,30,29,29,30,29,30,30,30,0,8,8), 
                    92=>array(0,29,30,30,29,29,30,29,29,30,29,30,30,0,9,9), 
                    93=>array(3,29,30,30,29,30,29,30,29,29,30,29,30,29,10,10), 
                    94=>array(0,30,30,30,29,30,29,30,29,29,30,29,30,0,1,11), 
                    95=>array(8,29,30,30,29,30,29,30,30,29,29,30,29,30,2,12), 
                    96=>array(0,29,30,29,30,30,29,30,29,30,30,29,29,0,3,1), 
                    97=>array(0,30,29,30,29,30,29,30,30,29,30,30,29,0,4,2), 
                    98=>array(5,30,29,29,30,29,29,30,30,29,30,30,29,30,5,3), 
                    99=>array(0,30,29,29,30,29,29,30,29,30,30,30,29,0,6,4), 
                    100=>array(0,30,30,29,29,30,29,29,30,29,30,30,29,0,7,5), 
                    101=>array(4,30,30,29,30,29,30,29,29,30,29,30,29,30,8,6), 
                    102=>array(0,30,30,29,30,29,30,29,29,30,29,30,29,0,9,7), 
                    103=>array(0,30,30,29,30,30,29,30,29,29,30,29,30,0,10,8), 
                    104=>array(2,29,30,29,30,30,29,30,29,30,29,30,29,30,1,9), 
                    105=>array(0,29,30,29,30,29,30,30,29,30,29,30,29,0,2,10), 
                    106=>array(7,30,29,30,29,30,29,30,29,30,30,29,30,30,3,11), 
                    107=>array(0,29,29,30,29,29,30,29,30,30,30,29,30,0,4,12), 
                    108=>array(0,30,29,29,30,29,29,30,29,30,30,29,30,0,5,1), 
                    109=>array(5,30,30,29,29,30,29,29,30,29,30,29,30,30,6,2), 
                    110=>array(0,30,29,30,29,30,29,29,30,29,30,29,30,0,7,3), 
                    111=>array(0,30,29,30,30,29,30,29,29,30,29,30,29,0,8,4), 
                    112=>array(4,30,29,30,30,29,30,29,30,29,30,29,30,29,9,5), 
                    113=>array(0,30,29,30,29,30,30,29,30,29,30,29,30,0,10,6), 
                    114=>array(9,29,30,29,30,29,30,29,30,30,29,30,29,30,1,7), 
                    115=>array(0,29,30,29,29,30,29,30,30,30,29,30,29,0,2,8), 
                    116=>array(0,30,29,30,29,29,30,29,30,30,29,30,30,0,3,9), 
                    117=>array(6,29,30,29,30,29,29,30,29,30,29,30,30,30,4,10), 
                    118=>array(0,29,30,29,30,29,29,30,29,30,29,30,30,0,5,11), 
                    119=>array(0,30,29,30,29,30,29,29,30,29,29,30,30,0,6,12), 
                    120=>array(4,29,30,30,30,29,30,29,29,30,29,30,29,30,7,1) 
                   ); 
############################## 
  #农历天干 
  $mten=array("null","甲","乙","丙","丁","戊","己","庚","辛","壬","癸"); 
  #农历地支 
  $mtwelve=array("null","子(鼠)","丑(牛)","寅(虎)","卯(兔)","辰(龙)", 
                 "巳(蛇)","午(马)","未(羊)","申(猴)","酉(鸡)","戌(狗)","亥(猪)"); 
  #农历月份 
  $mmonth=array("闰","正","二","三","四","五","六", 
                "七","八","九","十","十一","十二","月"); 
  #农历日 
  $mday=array("null","初一","初二","初三","初四","初五","初六","初七","初八","初九","初十", 
              "十一","十二","十三","十四","十五","十六","十七","十八","十九","二十", 
              "廿一","廿二","廿三","廿四","廿五","廿六","廿七","廿八","廿九","三十"); 
############################## 
  #星期 
  $weekday = array("星期日","星期一","星期二","星期三","星期四","星期五","星期六"); 
  #阳历总天数 至1900年12月21日 
  $total=11; 
  #阴历总天数 
  $mtotal=0; 
############################## 
  #获得当日日期 
  //$today=getdate();  //获取今天的日期
  if($nian<1901 || $nian>2020) die("年份出错！"); 
  //$cur_wday=$today["wday"]; //星期中第几天的数字表示
  for($y=1901;$y<$nian;$y++) { //计算到所求日期阳历的总天数-自1900年12月21日始,先算年的和 
       $total+=365; 
       if ($y%4==0) $total++; 
  } 
  switch($yue) { //再加当年的几个月 
         case 12: 
              $total+=30; 
         case 11: 
              $total+=31; 
         case 10: 
              $total+=30; 
         case 9: 
              $total+=31; 
         case 8: 
              $total+=31; 
         case 7: 
              $total+=30; 
         case 6: 
              $total+=31; 
         case 5: 
              $total+=30; 
         case 4: 
              $total+=31; 
         case 3: 
              $total+=28; 
         case 2: 
              $total+=31; 
  } 
  if($nian%4 == 0 && $yue>2) $total++; //如果当年是闰年还要加一天 
  $total=$total+$ri-1; //加当月的天数 
  $flag1=0;  //判断跳出循环的条件 
  $j=0; 
  while ($j<=120){  //用农历的天数累加来判断是否超过阳历的天数 
      $i=1; 
      while ($i<=13){ 
            $mtotal+=$everymonth[$j][$i]; 
            if ($mtotal>=$total){ 
                 $flag1=1; 
                 break; 
            } 
            $i++; 
      } 
      if ($flag1==1) break; 
      $j++; 
  } 
  if($everymonth[$j][0]<>0 and $everymonth[$j][0]<$i){ //原来错在这里，对闰月没有修补 
      $mm=$i-1; 
  } 
  else{ 
      $mm=$i; 
  } 
  if($i==$everymonth[$j][0]+1 and $everymonth[$j][0]<>0) { 
      $nlmon=$mmonth[0].$mmonth[$mm];#闰月 
  } 
  else { 
      $nlmon=$mmonth[$mm].$mmonth[13]; 
  } 
  #计算所求月份1号的农历日期 
  $md=$everymonth[$j][$i]-($mtotal-$total); 
  if($md > $everymonth[$j][$i]) 
      $md-=$everymonth[$j][$i]; 
  $nlday=$mday[$md]; 
  
  //$nowday=date("Y年n月j日 ")."w".$weekday[$cur_wday]." ".$mten[$everymonth[$j][14]].$mtwelve[$everymonth[$j][15]]."年".$nlmon.$nlday; 
  $nowday=$mten[$everymonth[$j][14]].$mtwelve[$everymonth[$j][15]]."年 ".$nlmon.$nlday; 
  return $nowday;
}
echo nongli('20160807'); //标准8位