php array find duplicates, sum them up & delete duplicates

Question

i have an array:

Array 
(
[0] => Array
    (
        [setid] => 2
        [income] => 100
    )

[1] => Array
    (
        [setid] => 2
              


        

Answer 1

Just create a new array which you make fast adressable by using the setid as key. And reindex the array at the end.

$result = array();
foreach ($array as $val) {
    if (!isset($result[$val['setid']]))
        $result[$val['setid']] = $val;
    else
        $result[$val['setid']]['income'] += $val['income'];
}
$result = array_values($result); // reindex array

Answer 2

Write your own function, that's no long road at all.

$result = array_reduce($originalArray, function($memo, $item){

  isset($memo[$item['setid']])
    ? $memo[$item['setid']] = $item['income']
    : $memo[$item['setid']] += $item['income'];
  return $memo;

}, []);

Answer 3

You should use the array_unique function that php's official site offers.

An example:

<?php
$input = array("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique($input);
print_r($result);
?>

Output:

Array
(
    [a] => green
    [0] => red
    [1] => blue
)

To sum the duplicated values you can use the array_count_values function:

<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>

Output would be:

Array
(
    [1] => 2
    [hello] => 2
    [world] => 1
)

Answer 4

This should work:

$values = array();
foreach($array as $val) {
    if(isset($values[$val['setid']])) {
        $values[$val['setid']] += $val['income'];
    } else {
        $values[$val['setid']] = $val['income'];
    }
}
//all values are now in $values array, keys are setid and values are income