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Edit File: PageInterface.php

<?php namespace WPMailSMTP\Admin; /** * Class PageInterface defines what should be in each page class. * * @since 1.0.0 */ interface PageInterface { /** * URL to a tab. * * @since 1.0.0 * * @return string */ public function get_link(); /** * Title of a tab. * * @since 1.0.0 * * @return string */ public function get_title(); /** * Link label of a tab. * * @since 1.0.0 * * @return string */ public function get_label(); /** * Tab content. * * @since 1.0.0 */ public function display(); }