It is possible sum values by keys? how do it (php)

Question

Array for example

$array = array(
  array('first'=>5), array('first'=>4), array('second'=>3)
);

How sum values by keys for result:

$result = array(
  'first'=>9,
  'second'=>3
);

Thanks in advance.

Answer 1

you can iterate array $array and do whatever you want. And you can do it with any language if you have some pprogramming skills.

$result=array();
foreach ($array as $sub) {
  foreach ($sub as $key => $value) {
    if (isset($result[$key])) $result[$key] += $value;
    else $result[$key]=$value;
  }
}

Note: if you getting this info from database, it is better to sum it using database resources.

Answer 2

You can use array_walk_recursive:

$results = array();
array_walk_recursive($array, function($number, $key){
    global $results;
    if (! isset($results[$key])) $results[$key] = 0;
    $results[$key] += $number;
});

This works in php >= 5.3

Answer 3

Col. Shrapnel, yes it's work, but result

foreach ($count_groups as $sub) {    
  foreach ($sub as $key => $value) {    
  echo $key." ";    
    if (isset($result[$key])) $result[$key] += $value;    
    else $result[$key]=$value;    
  }    
echo $result[$key]."<br>";

is list

$first - 5

$first - 9

$second - 3

but need final result

$first - 9

$second - 3

THANKS!!!