PHP: 3 time periods with different pricing - php

Question

It's all about booking...
I've got 3 time periods:
Period 3 from 01.01.2014 to 29.04.2014 - Price 3 (per day)
Period 2 from 30.04.2014 to 14.06.2014 - Price 2 (per day)
Period 1 from 15.06.2014 to 21.09.2014 - Price 1 (per day)
Period 4 from 22.09.2014 to 29.04.2015 - Price 3 (per day)
I've already made a php calculation that calculates the booked days and pricing for each period. But I can't figure it out how to calculate between two periods.
For example:
Somebody books from 26.01.2014 to 25.04.2014 = 89 days * Price 1
But it gets really hard when somebody books from period 3 to period 1 for... I tried to separate the calculations:
if ($check_in >= '2013-04-30' && $check_out <= '2014-09-21')
{
//Days and price calcs here
// contains Period 2 and Period 1
}
But it doesn't work well...
Do you have any ideas how to make the whole calculation to work perfectly?
I missed something really important.
Here is the structure:
Period 1
if($numberDays == 1)
{
$price = $price1_period1
}
if($numberDays >= 2 && $numberDays <= 3)
{
$price = $price2_period1 * $numberDays;
}
if($numberDays >= 4 && $numberDays <= 6)
{
$price = $price3_period1 * $numberDays;
}
if($numberDays >= 7 && $numberDays <= 14)
{
$price = $price4_period1 * $numberDays;
}
if($numberDays >= 15 && $numberDays <= 29)
{
$price = $price5_period1 * $numberDays;
}
if($numberDays >= 30)
{
$price = $price6_period1 * $numberDays;
}
It's the same for the other periods. Ex.: for period 2 the price for 6 days is $price3_period2.

Answer 1

You could generate a price for each day. Then loop from start date to end date and sum the dayprice to get the total price:
<?php
$oneDay = 24*3600;
$configs = array(
array(
'startTime' => strtotime('2014-01-01'),
'endTime' => strtotime('2014-04-29'),
'price' => 10
),
array(
'startTime' => strtotime('2014-04-30'),
'endTime' => strtotime('2014-06-14'),
'price' => 20
),
array(
'startTime' => strtotime('2014-06-15'),
'endTime' => strtotime('2014-09-21'),
'price' => 30
),
array(
'startTime' => strtotime('2014-09-22'),
'endTime' => strtotime('2015-04-29'),
'price' => 40
),
);
$prices = array();
foreach ($configs as $config)
{
$time1 = $config['startTime'];
$time2 = $config['endTime'];
$price = $config['price'];
while ($time1 <= $time2)
{
$prices[date('Y-m-d', $time1)] = $price;
$time1 += $oneDay;
}
}
/**
* #param $checkIn in format YYYY-mm-dd
* #param $checkOut in format YYYY-mm-dd
*/
function getTotalPrice($checkIn, $checkOut, $prices)
{
$time1 = strtotime($checkIn);
$time2 = strtotime($checkOut);
$price = 0;
while ($time1 <= $time2)
{
$time1 += 24 * 3600;
$price += $prices[date('Y-m-d', $time1)];
}
return $price;
}
echo getTotalPrice('2014-01-04', '2014-01-09', $prices);

Answer 2

First things first, I assume $check_in and $check_out are strings that you get from some form, then you are comparing them with another string, any of them are dates.
What you can do is convert both $check_in and $check_out to Datetime and then do the comparison, example:
// Check In Date
$check_in_date = new Datetime($check_in);
$date_compare_in = new Datetime('2013-04-30');
$diff_in = $check_in_date->diff($date_compare_in);
// Check Out Date
$check_out_date = new Datetime($check_out);
$date_compare_out = new Datetime('2014-09-21');
$diff_out = $check_out_date->diff($date_compare_out);
Now $diff_in is a DateInterval object that you can check for the quantity of days, example, if the hours are greater than 0, the $check_in was later than the compare date, if is less than 0 the $check_in was before.
if($diff_in->h >= 0 and $diff_out->h <= 0){
// We are within this date range.
}
a DateInterval Object has the following structure:
DateInterval Object
(
[y] => 0
[m] => 0
[d] => 0
[h] => 0
[i] => 0
[s] => 0
[invert] => 0
[days] => 0
)