基于第一个值php在php中添加值

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