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Edit File: CellIterator.php

<?php

namespace PhpOffice\PhpSpreadsheet\Worksheet;

use Iterator;
use PhpOffice\PhpSpreadsheet\Cell\Cell;

/**
 * @template TKey
 * @implements Iterator<TKey, Cell>
 */
abstract class CellIterator implements Iterator
{
    /**
     * Worksheet to iterate.
     *
     * @var Worksheet
     */
    protected $worksheet;

/**
     * Iterate only existing cells.
     *
     * @var bool
     */
    protected $onlyExistingCells = false;

/**
     * Destructor.
     */
    public function __destruct()
    {
        // @phpstan-ignore-next-line
        $this->worksheet = null;
    }

/**
     * Get loop only existing cells.
     */
    public function getIterateOnlyExistingCells(): bool
    {
        return $this->onlyExistingCells;
    }

/**
     * Validate start/end values for "IterateOnlyExistingCells" mode, and adjust if necessary.
     */
    abstract protected function adjustForExistingOnlyRange();

/**
     * Set the iterator to loop only existing cells.
     */
    public function setIterateOnlyExistingCells(bool $value): void
    {
        $this->onlyExistingCells = (bool) $value;

$this->adjustForExistingOnlyRange();
    }
}