SingleFlushStrategy.php

<?php

namespace Drupal\Core\Render\Placeholder;


/**
 * Defines the 'single_flush' placeholder strategy.
 *
 * This is designed to be the fallback strategy, so should have the lowest
 * priority. All placeholders that are not yet replaced at this point will be
 * rendered as is and delivered directly.
 */
class SingleFlushStrategy implements PlaceholderStrategyInterface {
    
    /**
     * {@inheritdoc}
     */
    public function processPlaceholders(array $placeholders) {
        // Return all placeholders as is; they should be rendered directly.
        return $placeholders;
    }

}