PHP: Increment variable on date change - php

Question

I'm building a class-schedule tool, where users can upload a .csv-file. I want to keep track of the dates with a variable so users can upload a schedule, which starts on the 15th of a month, for example. Therefore, I would like to increment a variable on date change. The data I receive from the csv looks like this:
array(
array(
'1',
'2019-10-15',
'Orientation / Team Building',
'371',
'',
'0',
'',
),
array(
'1',
'2019-10-16',
'Study Skills',
'371',
'',
'0',
'',
),
);
I would like to output one day at a time:
$currentMonth = date('F');
$dayOfSchedule = 0;
while ($dayOfSchedule < sizeof($schedule[$currentMonth]){
echo $schedule[$currentMonth][$dayOfSchedule][2]; //output the class etc.
}
and then increment $dayOfSchedule on the day change, but I don't know how to do that.
Any help is much appreciated!

Answer 1

You're probably looking for something like this:
<?php
$data = array(
array(
1,
'2019-10-16',
'Study Skills',
'371',
'',
0,
'',
),
array(
1,
'2019-10-16',
'Mathematics',
'371',
'',
0,
'',
),
array(
1,
'2019-10-15',
'Orientation / Team Building',
371,
'',
0,
'',
),
);
// map rows according to the date
$schedule = array_reduce($data, function ($accu, $row) {
$date = \DateTime::createFromFormat('Y-m-d', $row[1]);
$accu[$date->format('F')][$date->format('j')][] = $row;
return $accu;
}, []);
// sort the days and months
ksort($schedule);
array_walk($schedule, function (&$month_schedule) {
ksort($month_schedule);
});
$today = date('j'); // day of month today
if (isset($schedule[date('F')])) {
foreach ($schedule[date('F')] as $day => $rows) {
if ((int) $day >= (int) $today) {
echo " Day of Month: $day\n";
foreach ($rows as $key => $row) {
echo " Class({$key}): {$row[2]}\n";
}
}
}
echo "\n";
}