Array
(
    [010156] => Array
        (
            [supp_number] => 010156
            [totalamount] =>     4.113,23
            [debtorcred] => H
            [amount1] =>     4.113,23-
            [amount2] =>

            [amount3] =>
            [amount4] =>
            [amount5] =>
            [amount6] =>
        )
)



  Array
(
    [010156] => Array
        (
            [supp_number] => 010156
            [totalamount] =>     4.113,23
            [debtorcred] => H
            [amount1] =>     4.113,23-
            [amount2] =>

            [amount3] =>
            [amount4] =>
            [amount5] =>
            [amount6] =>
        )
)

Array
(
    [010156] => Array
        (
            [supp_number] =>  <<<TOTAL >>>
            [totalamount] =>     <<<TOTAL >>>
            [debtorcred] => <<<TOTAL >>>
            [amount1] =>      <<<TOTAL >>>
            [amount2] =>  <<<TOTAL >>>

            [amount3] =>  <<<TOTAL >>>
            [amount4] =>  <<<TOTAL >>>
            [amount5] =>  <<<TOTAL >>>
            [amount6] =>  <<<TOTAL >>>
        )
)

function array_merge_numeric_values()
{
    $arrays = func_get_args();
    $merged = array();
    foreach ($arrays as $array)
    {
        foreach ($array as $key => $value)
        {

            if ( ! isset($merged[$key]))
            {
                $merged[$key] = $value;
            }
            else
            {
                $merged[$key] += $value;
            }
        }
    }

$arr1 = array('amount1' => 1, 'amount2' => 6);
$arr2 = array('amount1' => 2, 'amount2' => 7);
$add = function($a, $b) { return $a + $b; };
$summedArray = array_map($add, $arr1, $arr2);
print_r($summedArray);

$array1 = array('my_num' => 10, 'my_num2' => 20);
$array2 = array('my_num' => 15, 'my_num2' => 25);
$newArray = array();
foreach($array1 as $num => $one){
    if(isset($array2[$num])){
        $newArray[$num] = $one+$array2[$num];
    } else {
        $newArray[$num] = $one;
    }
}

print_r($newarray);

function array_merge_numeric_values()
{
$arrays = func_get_args();

$merged = array();
foreach ($arrays as $array)
{
    foreach ($array as $key => $value)
    {
        if(!isset($merged[$key]))
        {
            $merged[$key] = array();
        }

        foreach($value as $kk => $vv)
        {
            if ( ! isset($merged[$key][$kk]))
            {
                $merged[$key][$kk] = $vv;
            }
            else
            {
                $merged[$key][$kk] += $vv;
            }
        }
    }
}