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A simple function to remove empty members/entries from an array in PHP:

 
 function remove_empty_members($arr)
{
    $newarr = array();
    while(list($key, $val) = each($arr))
    {
        if (is_array($val))
        {
            $val = remove_empty_members($val);
            // check if array has members
            if (count($val)!=0)
            {
                $narr[$key] = $val;
            }
        }
        else
        {
            if (trim($val) != "")
            {
                $narr[$key] = $val;
            }
        }
    }
    unset($arr);
    return $newarr;
}

That's it!