add values in php based off first value php - php

Question

I have an array as shown below which some rows will have the same name. I am getting nowhere fast trying to do what i want to achieve.
With a foreach loop how i would go through each one add the values of the same name up and put it into a new array?
Thanks :)
Array
(
[0] => Array
(
[0] => Name1
[1] => Value
)
[1] => Array
(
[0] => Name2
[1] => Value
)
[2] => Array
(
[0] => Name1
[1] => Value
)
[3] => Array
(
[0] => Name3
[1] => Value
)
[4] => Array
(
[0] => Name2
[1] => Value
)
This only a snippet and will change to length when the csv it comes from changes weekly Thanks

Answer 1

It's not the most efficient way yet but it's working the way you want it to happen.
<?php
$testArr = array(
array('Name1', 1),
array('Name2',2),
array('Name1',3)
);
$newArr = array();
$tmp = array();
foreach($testArr as $i=>$row)
{
if( in_array($row[0], $tmp) )
{
$key = array_search($row[0], $tmp);
$newArr[ $key ][1] += $row[1];
}
else
{
array_push( $newArr, array($row[0], $row[1]) );
array_push( $tmp, $row[0] );
}
}
print_r($newArr);
?>
OUTPUT
Array
(
[0] => Array
(
[0] => Name1
[1] => 4
)
[1] => Array
(
[0] => Name2
[1] => 2
)
)
Tested working, Check it here, phpFiddle

Answer 2

Do you want something like this?
$newData = [];
foreach ($array as $item) {
$newData[$item[0]][] = $item[1];
}
var_dump($newData);

Answer 3

You can get to the result with this approach.
$data_array = Array{};
$result_array = NULL;
foreach ($data_array as $value) {
$result_array[$value[0]] += $value[1];
}