Ouzo\Utilities\Arrays::filterNotBlank PHP Method

    public static function filterNotBlank(array $elements)
    {
        return array_filter($elements);
    }

 private static function _buildWhereKeys($params)
 {
     $keys = array();
     foreach ($params as $column => $value) {
         $keys[] = self::_buildWhereKey($column, $value);
     }
     return Arrays::filterNotBlank($keys);
 }