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Edit File: class-storage-interface.php

<?php /** * Storage interface. */ namespace XTS\WC_Wishlist; if ( ! defined( 'ABSPATH' ) ) { exit( 'No direct script access allowed' ); } /** * Storage interface. * * @codeCoverageIgnore * @since 1.0.0 */ interface Storage { /** * Add product to the wishlist. * * @since 1.0 * * @param integer $product_id Product id. * * @return boolean */ public function add( $product_id ); /** * Remove product from the wishlist. * * @since 1.0 * * @param integer $product_id Product id. * * @return boolean */ public function remove( $product_id ); /** * Get all products. * * @since 1.0 * * @return array */ public function get_all(); /** * Is product in compare. * * @since 1.0 * * @param integer $product_id Product id. * * @return boolean */ public function is_product_exists( $product_id ); }