PHP Multidimensional array - Remove part duplicates and add up - php

Question

I have a multidimensional array like so:
array(4) {
[0] => array(2) {
[0] => string(15)
"One"
[1] => string(5)
"11:31"
}
[1] => array(2) {
[0] => string(4)
"Two"
[1] => string(5)
"11:31"
}
[2] => array(2) {
[0] => string(15)
"Three"
[1] => string(5)
"11:31"
}
[3] => array(2) {
[0] => string(4)
"One"
[1] => string(5)
"11:31"
}
}
I am trying to get the ones with the first value removed but added up together. So it would end up like so:
array(3) {
[0] => array(2) {
[0] => string(15)
"One"
[1] => string(5)
"22:62"
}
[1] => array(2) {
[0] => string(4)
"Two"
[1] => string(5)
"11:31"
}
[2] => array(2) {
[0] => string(15)
"Three"
[1] => string(5)
"11:31"
}
}
Note the last 'One' has been removed and the second value in the array has been added up there from two 11:31's to 22:62. I hope that makes sense.
Is there something or a specific function I should look at to push me in the right direction? Any help much appreciated.
This is not just a straight up removing duplicates from what I can tell, as none are ever exactly the same although the second values are in this example, they won't be in live data.

Answer 1

You could make a loop and group elements into a new array using key [0]. It the key doesn't exists in the new array, simply add the new array. Otherwise, you could parse the existing value to add the new value:
$array = [
["One", "11:31"],
["Two", "11:31"],
["Three", "11:31"],
["One", "11:31"],
];
$out = [];
foreach ($array as $item) {
// if $item[0] is not an existing key,
if (!isset($out[$item[0]])) {
// add $item as-is
$out[$item[0]] = $item;
} else {
// parse current time
list($h1, $m1) = explode(':', $item[1]);
$m1 += $h1 * 60;
// parse existing time
list($h2, $m2) = explode(':', $out[$item[0]][1]);
$m1 += $m2 + $h2 * 60;
// compute new time
$h = floor($m1 / 60);
$out[$item[0]][1] = sprintf("%02d:%02d", $h, $m1-$h*60);
}
}
// array_values removes 'named' keys.
print_r(array_values($out));
Output (condensed):
Array
(
[0] => Array ([0] => One [1] => 23:02)
[1] => Array ([0] => Two [1] => 11:31)
[2] => Array ([0] => Three [1] => 11:31)
)