Calculate total sum of all values from all rows of a 2d array

Question

I'm having a 2-dimensional array and I need to get the total sum of the values.

[
    [
        'agent_example1' => 0,
        'agent_example2' => 2,
        'agent_example3' => 0,
        'agent_example4' => 1,
        '' => 0,
    ],
    [
        'agent_example1' => 0,
        'agent_example2' => 1,
        'agent_example3' => 0,
        'agent_example4' => 0,
        '' => 0,
    ],
    [
        'agent_example1' => 0,
        'agent_example2' => 3,
        'agent_example3' => 0,
        'agent_example4' => 0,
        '' => 0,
    ],
]

Result should be 7.

What result do you get when you take the sum of the values in the array? — user554546
– user554546, Commented Sep 30, 2011 at 21:31

Jon Newmuis · Accepted Answer · 2011-09-30 21:31:38Z

2

You may want to try something like this:

function sum_2d_array($outer_array) {
    $sum = 0;
    foreach ($outer_array as $inner_array) {
        foreach ($inner_array as $number) {
            $sum += $number;
        }
    }
    return $sum;
}

answered Sep 30, 2011 at 21:31

Jon Newmuis

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Comments

Dominic · Accepted Answer · 2011-09-30 21:39:27Z

1

Or even easier:

function crash_reporter($evaluation){

    $sum = 0;
    foreach ($evaluation as $agent){    
        unset($agent['time']);
        $sum += array_sum($agent);
    }
    echo $sum;
}

answered Sep 30, 2011 at 21:39

Dominic

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Comments

salathe · Accepted Answer · 2011-09-30 21:38:54Z

0

You can sum the sums of each sub-array ($agent), after your foreach/unset loop, like:

$sum = array_sum(array_map('array_sum', $evaluation));

answered Sep 30, 2011 at 21:38

salathe

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Comments

mickmackusa · Accepted Answer · 2024-01-14 04:48:34Z

0

While I would use salathe's solution for this specific scenario, I'll offer some alternatives.

You can visit all leafnodes with a functional-style script via array_walk_recursive() by passing the result variable as a modifiable reference.

Code: (Demo)

$result = 0;
array_walk_recursive(
    $array,
    function ($v) use (&$result) {
        $result += $v;
    }
);
var_export($result);  // 7

Or use a recursive iterator with a classic loop.

Code: (Demo)

$result = 0;
foreach(new RecursiveIteratorIterator(new RecursiveArrayIterator($array), RecursiveIteratorIterator::LEAVES_ONLY) as $value) {
    $result += $value;
} 
var_export($result);  // 7

answered Jan 14, 2024 at 4:48

mickmackusa♦

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