PlaceholderInterface.php

<?php

namespace Drupal\Core\Database\Query;


/**
 * Interface for a query that accepts placeholders.
 */
interface PlaceholderInterface {
    
    /**
     * Returns a unique identifier for this object.
     */
    public function uniqueIdentifier();
    
    /**
     * Returns the next placeholder ID for the query.
     *
     * @return
     *   The next available placeholder ID as an integer.
     */
    public function nextPlaceholder();

}