thephpleague / csv

     */

    public function fetchDelimitersOccurrence(array $delimiters, $nb_rows = 1)

    {

        if (!($nb_rows = filter_var($nb_rows, FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]))) {

            throw new InvalidArgumentException('The number of rows to consider must be a valid positive integer');

        }

        $filterRow = function ($row) {

            return is_array($row) && count($row) > 1;

     */

    public function setColumnsCount($value)

    {

        if (false === filter_var($value, FILTER_VALIDATE_INT, ['options' => ['min_range' => -1]])) {

            throw new InvalidArgumentException('the column count must an integer greater or equals to -1');

        }

        $this->detect_columns_count = false;

        $this->columns_count = $value;

    }

     */

    protected function assertValidColumnIndex($index)

    {

        if (false === filter_var($index, FILTER_VALIDATE_INT, ['options' => ['min_range' => 0]])) {

            throw new InvalidArgumentException('the column index must be a positive integer or 0');

        }

    }

    /**

            return $offset_or_keys;

        }

        if (false === filter_var($offset_or_keys, FILTER_VALIDATE_INT, ['options' => ['min_range' => 0]])) {

            throw new InvalidArgumentException('the row index must be a positive integer, 0 or a non empty array');

        }

        $keys = $this->getRow($offset_or_keys);

        $this->assertValidAssocKeys($keys);