OrderIncrementIdChecker.php

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<?php
declare(strict_types=1);

namespace Magento\Sales\Model;

class OrderIncrementIdChecker
{
    private $resourceModel;

    public function __construct(ResourceModel\Order $resourceModel)
    {
        $this->resourceModel = $resourceModel;
    }

    public function isIncrementIdUsed($orderIncrementId): bool
    {
        $adapter = $this->resourceModel->getConnection();
        $bind = [':increment_id' => $orderIncrementId];
        $select = $adapter->select();
        $select->from($this->resourceModel->getMainTable(), $this->resourceModel->getIdFieldName())
            ->where('increment_id = :increment_id');
        $entity_id = $adapter->fetchOne($select, $bind);
        if ($entity_id > 0) {
            return true;
        }

        return false;
    }
}