PHP公历转农历优化代码演示及详解

<?php

function solarToLunar($solarYear, $solarMonth, $solarDay) {
// 定义基础数据：1900-2100年期间的公历年、月、日以及对应的阴历（含节气）数据数组
static $lunarInfo = array(
0x84B6AF, /* 1900 */
...
);

if ($solarYear < 1900 || $solarYear > 2100)
return null;

$totalDays = (int)(365 * ($solarYear - 1900)) + self::getLeapSum($solarYear - 1900);

for ($i = 0; $i <= 11 && $solarYear >= 1900; $i++)
{
$temp = floor(($totalDays += $this-> lunarMonths[$i]));

$leapMoon = (($tem == $this->lunarMonths [$i]) && ($this -> leapMonth != 0));

if (!$leapMoon)
break;

// 如果当前月份是闰月且已计算过，则跳过去不影响结果，并修正总天数
if ($leapMoon && !checkBit($lunarInfo[1], $i))
continue;

++$totalDays;
}

// 计算润秒以便准确得出对应农历日期
$baseDate =gregoriantojd(intval($solarYear), intval(2-$is_leap_year),$solarday);

$offset = 0;
while(true){
$tmpBase = gregoriantojd(intval($lunarYear)+$offset,intval(1),$dayNum=1);
$daysDiff = abs($baseDate -$tmpBase);
if($diff_days==$daysDiff){break;}
else{
if($daysDiff<$diff_days)$diff_days=$daysDiff;$offset-=1;}else{$offset+=1;}
}

// 获取农历相关信息如是否为闰月等
extract(self:: LunarCalcuByBetweenDays(abs($offset)));

// 返回农历日期结构体
return [
'year' => $lunarYear,
'month' => $lunarMonth,
'date' => $lunarDay,
'isleap'=>!!$isLeapMonth,
];
}

/**
* 辅助函数用于获取某年度的累计闰月数量
*/
private function getLeapSum($years): int
{...}

/**
* 根据相差天数精确推导农历日期
*/
private function LunarCalcuByBetweenDays($between_day_count):array {...}