silverstripe-framework/src/i18n/Messages/MessageProvider.php

<?php

namespace SilverStripe\i18n\Messages;

/**
 * Provides localisation of messages
 */
interface MessageProvider
{
    /**
     * Localise this message
     *
     * @param string $entity Identifier for this message in Namespace.key format
     * @param string $default Default message
     * @param array $injection List of injection variables
     * @return string Localised string
     */
    public function translate($entity, $default, $injection);

    /**
     * Pluralise a message
     *
     * @param string $entity Identifier for this message in Namespace.key format
     * @param array|string $default Default message with pipe-separated delimiters, or array
     * @param array $injection List of injection variables
     * @param int $count Number to pluralise against
     * @return string Localised string
     */
    public function pluralise($entity, $default, $injection, $count);
}