how to sum 2d array - php

Question

Good evening
I have a question here. i have two arrays: $duration_c[$k][$s]. it prints all ok
$duration_c[0][0]="19:30:00";
$duration_c[0][1]="00:10:00";
$duration_c[1][0]="00:30:00";
$duration_c[1][1]="00:20:00";
than to sum
$times=$duration_c[$k][$s];
function sum_the_time($times) {
$seconds = 0;
foreach ($times as $time)
{
list($hour,$minute,$second) = explode(':', $time);
$seconds += $hour*3600;
$seconds += $minute*60;
$seconds += $second;
}
$hours = floor($seconds/3600);
$seconds -= $hours*3600;
$minutes = floor($seconds/60);
$seconds -= $minutes*60;
// return "{$hours}:{$minutes}:{$seconds}";
return sprintf('%02d:%02d:%02d', $hours, $minutes, $seconds);
}
echo sum_the_time($times);
how to sum $duration_c[0][0]+$duration_c[0][1] and $duration_c[1][0]+$duration_c[1][1], and how to print?
there is error Invalid argument supplied for foreach()

Answer 1

you are sending only one value to sum_the_time function as $times=$duration_c[$k][$s];
$times has only one value you can print and check what value is going to the function by writing like this
$times=$duration_c[$k][$s];
echo $times;
use
$times=$duration_c[$k];
so that you can send array to your function and foreach will not give you error
$times=$duration_c[$k]; // contains array of times
function sum_the_time($times) {
$seconds = 0;
foreach ($times as $time)
{
list($hour,$minute,$second) = explode(':', $time);
$seconds += $hour*3600;
$seconds += $minute*60;
$seconds += $second;
}
$hours = floor($seconds/3600);
$seconds -= $hours*3600;
$minutes = floor($seconds/60);
$seconds -= $minutes*60;
// return "{$hours}:{$minutes}:{$seconds}";
return sprintf('%02d:%02d:%02d', $hours, $minutes, $seconds);
}
echo sum_the_time($times);

Answer 2

This does it less in PHP code, and keeps the execution flow as much as possibly in the PHP runtime, written in C:
<?php
$duration_c[0][0]="19:30:00";
$duration_c[0][1]="00:10:00";
$duration_c[1][0]="00:30:00";
$duration_c[1][1]="00:20:00";
$sum = 0;
foreach($duration_c as $durations) {
$today = strtotime('today');
$sum += array_sum(array_map(function($str) use ($today) {
return strtotime($str)-$today;
}, $durations));
}
echo $sum; // 73800 seconds, that's 20.5 hours

Answer 3

$times=$duration_c[$k][$s]; should be $times=$duration_c[$k];, otherwise you are passing a single time to the function, not an array of times.