add the values of two different associative arrays in php . display unique key-values too in the result array

Question

i need to merge two associative arrays which may or may not contain same key,if key is same the values need to added and stored in the resultant array

 $array1 = array(
      'a' => 5,
      'b' => 10,
      'c' => 6,
      'k' = > 10
    );

$array2 = array(
  'a' => 100,
  'c' => 200,
  'd' => 30,
  'k' => 10
);

how to add the above two associative arrays and receive the following output/associative array -

 $array2 = array(
      'a' => 105,
      'b' => 10,
      'c' => 206,
      'd' => 30,
      'k' => 20
    );

see http://stackoverflow.com/questions/6086267/how-to-merge-two-arrays-by-summing-the-merged-values — Tamil Selvan C, Apr 20 '13 at 10:18

score 4 · Accepted Answer · answered Apr 20 '13 at 10:18

4

Try

 $array1 = array(
      'a' => 5,
      'b' => 10,
      'c' => 6,
      'k' => 10
    );

$array2 = array(
  'a' => 100,
  'c' => 200,
  'd' => 30,
  'k' => 10
);

$sums = array();
foreach (array_keys($array1 + $array2) as $key) {
    $sums[$key] = (isset($array1[$key]) ? $array1[$key] : 0) + (isset($array2[$key]) ? $array2[$key] : 0);
}

print_r($sums);

answered Apr 20 '13 at 10:18

Tamil Selvan C

19,913
12
49
70

Works fine...Thanks a lot !! ...However,could you plz explain a bit about the following part- (isset($array1[$key]) ? $array1[$key] : 0) – Mayur Apr 20 '13 at 10:36
If you think it works you should accept his answer Mayur – antony Apr 20 '13 at 10:55
@antony--i accept Tamil Selvan's answer...just wanted a little explaination about (isset($array1[$key]) ? $array1[$key] : 0) as I am new to PHP and also programming. – Mayur Apr 20 '13 at 10:58
@Mayur You haven't accepted it. You have to click on the tick. If you want to learn about shorthand conditional statements then ask another question or read here http://davidwalsh.name/php-ternary-examples. – antony Apr 20 '13 at 11:19
Gentlemen,its accepted now...!!! (m new to stackoverflow.com,so dint know..SORRY) – Mayur Apr 20 '13 at 11:28

Yadav Chetan · Answer 2 · 2013-04-20T10:37:07.860

1

for finding unique index value

$array2 =array_merge($array1,$array2);

and for finding unique value you can try

$array2 =array_unique(array_merge($array1,$array2));

edited Apr 20 '13 at 10:37

answered Apr 20 '13 at 10:19

Yadav Chetan

1,874
2
23
43

score 1 · Answer 3 · answered Apr 20 '13 at 10:28

1

$a3 = array_merge_recursive ($array1, $array2);
foreach ($a3 as $key => $value)
{
    $a3[$key] = (is_array($value))?array_sum($value):$value;
}

answered Apr 20 '13 at 10:28

Amit

1,365
8
15

score 0 · Answer 4 · answered Apr 20 '13 at 10:19

I don't know if you can do this with an internal function but it is doable by simply iterating through both arrays.

function merge_add($array1, $array2)
{
    $result = array();
    merge_add_array($array1, $result);
    merge_add_array($array2, $result);
    return $result;
}

function merge_add_array($array, &$result)
{
    foreach ($array as $key=>$value)
    {
        if (array_key_exists($key, $result))
        {
            $result[$key] += $value;
        }
        else
        {
            $result[$key] = $value;
        }
    }
}

$result = merge_add($array1, $array2);

The & will cause passing by reference

antony · Answer 5 · 2013-04-20T10:35:20.990

<?php
$array1 = array(
      'a' => 5,
      'b' => 10,
      'c' => 6,
      'k' => 10
    );

$array2 = array(
  'a' => 100,
  'c' => 200,
  'd' => 30,
  'k' => 10
);

$keys = array_keys($array1 + $array2);

foreach ($keys as $key) {
    $array2[$key] = isset($array1[$key]) && isset($array2[$key]) ? ($array1[$key] + $array2[$key]) : (isset($array1[$key]) ? $array1[$key] : $array2[$key]);
}

print_r($array2);

add the values of two different associative arrays in php . display unique key-values too in the result array

5 Answers5