test_program

<?php
$output = array();
$sales = array('FIRST' => array('RED' => array(9, 3), 'GREEN' => array(4, 5, 8, 2)), 'SECOND' => array('RED' => array(3, 5, 5, 2), 'YELLOW' => array(4, 2, 5)), 'THIRD' => array('BLUE' => array(1, 2, 4), 'RED' => array(9, 4, 6)), 'FOUR' => array('BLUE' => array(2, 3, 3, 5), 'BLACK' => array(4, 5, 8, 9)));
foreach ($sales as $each_day) {

    foreach ($each_day as $key => $value) {

        switch ($key) {
            case 'RED':
                    $output[$key] +=array_sum($value);
                break;
            case 'GREEN':
                    $output[$key] +=array_sum($value);
                break;
            case 'YELLOW':
                    $output[$key] +=array_sum($value);
                break;
            case 'BLACK':
                    $output[$key] += array_sum($value);
                break;
            case 'BLUE':
                    $output[$key] +=array_sum($value);
                break;
        }
    }
}
echo "<pre>";
print_r($output);
echo "</pre>";
?>