Edit: interface-wpseo-wordpress-integration.php

<?php /** * WPSEO plugin file. * * @package WPSEO */ if ( ! interface_exists( 'WPSEO_WordPress_Integration' ) ) { /** * An interface for registering integrations with WordPress. */ interface WPSEO_WordPress_Integration { /** * Registers all hooks to WordPress. * * @return void */ public function register_hooks(); } }

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