vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/RowIterator.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Worksheet;

use Iterator;
use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;

class RowIterator implements Iterator
{
    /**
     * Worksheet to iterate.
     *
     * @var Worksheet
     */
    private $subject;

    /**
     * Current iterator position.
     *
     * @var int
     */
    private $position = 1;

    /**
     * Start position.
     *
     * @var int
     */
    private $startRow = 1;

    /**
     * End position.
     *
     * @var int
     */
    private $endRow = 1;

    /**
     * Create a new row iterator.
     *
     * @param Worksheet $subject The worksheet to iterate over
     * @param int $startRow The row number at which to start iterating
     * @param int $endRow Optionally, the row number at which to stop iterating
     */
    public function __construct(Worksheet $subject, $startRow = 1, $endRow = null)
    {
        // Set subject
        $this->subject = $subject;
        $this->resetEnd($endRow);
        $this->resetStart($startRow);
    }

    /**
     * Destructor.
     */
    public function __destruct()
    {
        $this->subject = null;
    }