php 账单生成

<?php


$start = '2019-01-30';
$end = '2020-01-29';


// 月账单
function billMonth($start, $end) {
    $m = [];
    do {
        $mend = getNextMonthEnd($start);
        if (strtotime($mend) > strtotime($end)) {
            $mend = $end;
        }
        $m[] = [
            's' => preDate($start),
            'e' => $mend
        ];
        $start = date('Y-m-d', strtotime($mend) + 3600*24);
    }
    while(strtotime($mend) < strtotime($end));
    return $m;
}

//季度账单
function billQuarter($start, $end) {
    $bill = billMonth($start, $end);
    
}


//获得下个月年，月
function getNextDate($year, $m) {
    if ($m == 12) {
        $m = 1;
        $year += 1;
    } else {
        $m++;
    }
    return [$year, $m];
}

//获取月份的最后一天
function getMonthLastDay($year, $m) {
    $t = date('t', strtotime($year .'-'. $m.'-01'));
    return $t;
}

//获取一个账单结束日
function getNextMonthEnd($start) {
    //获取开始年
    $year = date('Y', strtotime($start));
    //获取开始日
    $d = date('j', strtotime($start));
    //获取开始月
    $m = date('n', strtotime($start));
    
    if ($d == 1) { //如果是第一天，自然月处理
        $t = getMonthLastDay($year, $m);
        return sprintf("%s-%s-%s", $year, preNum($m), preNum($t));
    } else {
        //判断下个月最大天数
        list($year, $m) = getNextDate($year, $m);
        $nextMonthLastDay = getMonthLastDay($year, $m);
        if ($nextMonthLastDay>$d) { //如果下个月最后一天 大于开始时间的日期， 说明可以做一个月账期
            return sprintf("%s-%s-%s", $year, preNum($m), preNum($d-1));            
        } else { //做不到，直接截到月末
            return sprintf("%s-%s-%s", $year, preNum($m), preNum($nextMonthLastDay));
        }
    }
}



//有前导0的日期
function preDate($date) {
    return date('Y-m-d', strtotime($date));
}

//处理前导0
function preNum($num) {
    return substr("0".$num, -2);    
}


function feeMonth($start, $end, $total_fee) {
    $bill = billMonth($start, $end);
    //先算月账单


    $perMonth_fee = round($total_fee/count($bill), 2);  //每月平均价格

    //看看是不是算多了或少了, 补齐到第一个月

    $tmp = $perMonth_fee * (count($bill) - 1);
    if (($perMonth_fee + $tmp) > $total_fee) {
        $firstMonth_fee =  $perMonth_fee - (($perMonth_fee + $tmp) - $total_fee);
    } else {
        $firstMonth_fee = $total_fee - $tmp;
    }
    for($i = 0; $i<count($bill); $i++) {
        if ($i==0) {
            $bill[$i]['fee'] = $firstMonth_fee;
        } else {
            $bill[$i]['fee'] = $perMonth_fee;
        }
    }
    return $bill;
}

//季度账单
function feeQuarter($start, $end, $total_fee) {
    $feeMonth = feeMonth($start, $end, $total_fee);
    $q = array_chunk($feeMonth, 3);
    $quarterFee = [];
    for($j = 0; $j<count($q); $j++) {
        $quarterFee[$j] = [
            'fee' => 0
        ];
        for($i=0; $i<count($q[$j]); $i++) {
            if ($i == 0) {
                $quarterFee[$j]['s'] = $q[$j][$i]['s'];
            }
            $quarterFee[$j]['fee'] += $q[$j][$i]['fee'];
            if ($i == count($q[$j]) - 1) {
                $quarterFee[$j]['e'] = $q[$j][$i]['e'];
            }
        } 
        
    }
    return $quarterFee;
}

//年
function feeYear($start, $end, $total_fee, $times = 1, $type = 0) {
    $split = $times * 12;
    $feeMonth = feeMonth($start, $end, $total_fee);
    $q = array_chunk($feeMonth, $split);
    $yearFee = [];
    for($j = 0; $j<count($q); $j++) {
        $yearFee[$j] = [
            'total_taxes' => 0
        ];
        if ($type == 1) { //中付 计算中间日期
            $mid = ceil(count($q[$j])/2) - 1;
            $mid_start = $q[$j][$mid]['s'];
            $mid_date = date("Y-m-d", strtotime($mid_start) + 3600 *24 *15);
            $yearFee[$j]['bill_day'] = $mid_date;
        }
        
        for($i=0; $i<count($q[$j]); $i++) {
            if ($i == 0) {
                $yearFee[$j]['bill_start_time'] = $q[$j][$i]['s'];
                if ($type == 0) {
                    $yearFee[$j]['bill_day'] = $q[$j][$i]['s'];
                }
            }
            
            $yearFee[$j]['total_taxes'] += $q[$j][$i]['fee'];
            if ($i == count($q[$j]) - 1) {
                $yearFee[$j]['bill_end_time'] = $q[$j][$i]['e'];
                if ($type == 2) {
                    $yearFee[$j]['bill_day'] = date('Y-m-d', strtotime($q[$j][$i]['e']) + 3600 * 24);
                }
            }
        } 
        
    }
    return $yearFee;
}

$total_fee = 200000;
echo "月账单：\n";
print_r(feeYear($start, $end, $total_fee, 0.1, 1));
echo "季账单：\n";
print_r(feeYear($start, $end, $total_fee, 0.3, 1));
//echo "半年账单：\n";
//print_r(feeYear($start, $end, $total_fee, 0.5));
//echo "全年账单：\n";
//print_r(feeYear($start, $end, $total_fee, 1));
//echo "2年账单：\n";
//print_r(feeYear($start, $end, $total_fee, 2));
//echo "5年账单：\n";
//print_r(feeYear($start, $end, $total_fee, 5));

/*
echo "总月数:".count($bill)."\n";
echo "总费用:". $total_fee."\n";
echo "首月价格:".$firstMonth_fee."\n";
echo "每月价格:".$perMonth_fee."\n";
echo "总费用计算:". ( $firstMonth_fee + $perMonth_fee*(count($bill)-1))."\n";
*/
//如果需要季度账单


///print_r($bill);