Generic PHP function for TYPO3 to generate routeEnhancer slugs for a table

slug.php

/**
     * Generate slugs for a table
     *
     * Author: Jacco van der Post <jacco@id-webdesign.nl>
     *
     * @param string $table - The table to create the slugs in
     * @param string $slugFieldName - The slug or path segment fieldname
     * @param string $title - The field where the slug will be based on
     * @param bool $forceOverwrite - Forces rewrite of all slug values
     *
     * @return void
     */
    private function generateSlugsForTable(string $table = null, string $slugFieldName = null, string $title = null, bool $forceOverwrite = false) {
        if ($table && $slugFieldName && $title) {
            $records = [];
            $connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);
            $queryBuilder = $connectionPool->getQueryBuilderForTable($table);

            if ($forceOverwrite) {
                $queryBuilder
                    ->update($table)
                    ->set($slugFieldName, null)
                    ->execute();

                $queryBuilder->resetQueryParts();
                $statement = $queryBuilder
                    ->select('uid', $title)
                    ->from($table)
                    ->execute();
            } else {
                // Select all records which have no slug value
                $statement = $queryBuilder
                    ->select('uid', $title)
                    ->from($table)
                    ->where(
                        $queryBuilder->expr()->isNull($slugFieldName))
                    ->orWhere (
                        $queryBuilder->expr()->eq($slugFieldName, $queryBuilder->createNamedParameter('', \PDO::PARAM_STR))
                    )
                    ->execute();
            }

            while ($row = $statement->fetch()) {
                $records[] = $row;
            }

            // Get TYPO3 slughelper
            $tcaConfiguration['generatorOptions']['fields'][] = $title;
            $this->slugHelper = GeneralUtility::makeInstance(SlugHelper::class, $table, $slugFieldName, $tcaConfiguration);

            foreach ($records as $record) {
                // Make a slug
                $trySlug = $this->slugHelper->sanitize(str_replace('/', '', $record[$title]));
                $slug = $trySlug;

                // Check if it's unique
                $notUniqueSlug = true;
                $slugCounter = 1;

                while ($notUniqueSlug) {
                    $queryBuilder->resetQueryParts();
                    $existingSlugs = $queryBuilder
                        ->count('uid')
                        ->from($table)
                        ->where(
                            $queryBuilder->expr()->eq($slugFieldName, $queryBuilder->createNamedParameter($slug, \PDO::PARAM_STR))
                        )
                        ->execute()
                        ->fetchColumn(0);

                    if ($existingSlugs > 0) {
                        $slug = $trySlug . '-' . $slugCounter;
                        $slugCounter++;
                    } else {
                        $notUniqueSlug = false;

                        // Store unique slug
                        $queryBuilder->resetQueryParts();
                        $queryBuilder
                            ->update($table)
                            ->where(
                                $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($record['uid'], \PDO::PARAM_INT))
                            )
                            ->set($slugFieldName, $slug)
                            ->execute();
                    }
                };
            }

            $this->logger->info(count($records) . ' slugs generated for table ' . $table);

        } else {
            $this->logger->error('Error on generating slugs.');
        }
    }