Laravel: how to group by date and calculate number of hours - php

Question

this is more of a logic question. I have this table design for all the attendance logs of every user
I can calculate the time differences and number of hours worked for each row.
What i need to do is to calculate the hours for each date and subtract 8 hours for each day to get the overtime hours.
for($i=0; $i < count($logs)-1; $i++ ){
if($logs[$i]->status == 'out'){
if ($i != 0) {
$dattime1 = new Carbon($logs[$i]->log_date.' '. $logs[$i]->log_time);
if ($logs[$i-1]->status == 'in') {
$dattime2 = new Carbon($logs[$i-1]->log_date.' '. $logs[$i-1]->log_time);
$diff = $dattime1->diff($dattime2);
$hr_array[] = $diff->h;
$min_array[] = $diff->i;
$sec_array[] = $diff->s;
$arr[] = $diff
}
}
}
}
I can get minutes and hours each row. I want to group the rows with the same dates and calculate the total hours worked so i can get the overtime.
Thanks

Answer 1

I didn't test this out but it could give you an idea on how to solve it
<?php
// for each date, keep adding difference in minutes here
// use date as array key
$workedMinutesPerDay = [
// '2019-11-04' => minutes value
];
// keep 'in' date value here
$inDate = '';
foreach($logs as $log) {
$date = new Carbon($log->log_date.' '. $log->log_time);
// if 'in' value, remember the date and time and continue to next row
// next row should be out
if ($log->status = 'in') {
$inDate = $date;
continue;
}
// if you will always have 'in' then 'out' in order, this code is fine
// but you should handle inconsistencies here
// use remembered 'in' value stored in $inDate to calculate the diff in minutes
$diffInMinutes = $date->diffInMinutes($inDate);
// use $workedMinutesPerDay array with 'log_date' as key
// if we don't have the entry for the day, add new one
if (empty($workedMinutesPerDay[$log->log_date])) {
$workedMinutesPerDay[$log->log_date] = $diffInMinutes;
}
// date entry was already there, add current diffInMinutes to previous value
$workedMinutesPerDay[$log->log_date] += $diffInMinutes;
}
After running this, you would have array like this (hypothetical values), didn't calculate real values from the picture
$workedMinutesPerDay = [
'2019-11-04' => 100, // total minutes for the day
'2019-11-05' => 200,
'2019-11-08' => 300,
'2019-11-11' => 400,
'2019-11-12' => 500,
];