Sum the values of two associative multi-dimensional arrays in PHP

Question

I am trying to sum the values of two associative arrays. This is the first array:

Array
(
[Jan 01, 2013] => Array
    (
        [COM] => 100
        [         


        

Answer 1

Try this:

 1,
      'b' => 2
   );

    $array_02 = array(
      'a' => 0,
      'b' => 1,
      'c' => 2
    );

    /** first we should get the array keys union
     * this is too long...,so you can make it better :D
     * you can make this more readable
     */
    $keyUnion = array_unique(array_merge(array_keys($array_01), array_keys($array_02))); 
    $res = array();

    //sum
    foreach ($keyUnion as $k => $v) {
        $res[$v] = (isset($array_01[$v]) ? $array_01[$v] : 0) + (isset($array_02[$v]) ? $array_02[$v] : 0);
    }

    print_r($res);
?>

Notice: code only get the one-dimensional associative sum