File Content: estimated-reading-time.php <?php namespace Yoast\WP\SEO\Integrations; use Yoast\WP\SEO\Conditionals\Admin\Estimated_Reading_Time_Conditional; /** * Estimated reading time class. */ class Estimated_Reading_Time implements Integration_Interface { /** * Returns the conditionals based in which this loadable should be active. * * @return array */ public static function get_conditionals() { return [ Estimated_Reading_Time_Conditional::class ]; } /** * Initializes the integration. * * This is the place to register hooks and filters. * * @return void */ public function register_hooks() { \add_filter( 'wpseo_metabox_entries_general', [ $this, 'add_estimated_reading_time_hidden_fields' ] ); } /** * Adds an estimated-reading-time hidden field. * * @param array $field_defs The $fields_defs. * * @return array */ public function add_estimated_reading_time_hidden_fields( $field_defs ) { if ( \is_array( $field_defs ) ) { $field_defs['estimated-reading-time-minutes'] = [ 'type' => 'hidden', 'title' => 'estimated-reading-time-minutes', ]; } return $field_defs; } } Submit