Extend WooCommerce Subscriptions Timeframes

gistfile1.txt

<?php
     	/**
         * Plugin Name: Extend WooCommerce Subscription Intervals
         * Description: Add custom billing & subscription intervals to WooCommerce Subscriptions
         * Author: Matt Pramschufer
         * Author URI: https://emoxie.com
         * Version: 1.0
         * License: GPL v2
         */

	function eg_extend_subscription_period_intervals( $intervals ) {

                $intervals[6] = sprintf( __( 'every %s', 'my-text-domain' ), WC_Subscriptions::append_numeral_suffix( 6 ) );
                $intervals[7] = sprintf( __( 'every %s', 'my-text-domain' ), WC_Subscriptions::append_numeral_suffix( 7 ) );
                $intervals[8] = sprintf( __( 'every %s', 'my-text-domain' ), WC_Subscriptions::append_numeral_suffix( 8 ) );
                $intervals[9] = sprintf( __( 'every %s', 'my-text-domain' ), WC_Subscriptions::append_numeral_suffix( 9 ) );
                $intervals[10] = sprintf( __( 'every %s', 'my-text-domain' ), WC_Subscriptions::append_numeral_suffix( 10 ) );
                $intervals[11] = sprintf( __( 'every %s', 'my-text-domain' ), WC_Subscriptions::append_numeral_suffix( 11 ) );
                $intervals[12] = sprintf( __( 'every %s', 'my-text-domain' ), WC_Subscriptions::append_numeral_suffix( 12 ) );

                return $intervals;
        }
	add_filter( 'woocommerce_subscription_period_interval_strings', 'eg_extend_subscription_period_intervals' );


        function eg_extend_subscription_lengths( $subscription_lengths ) {

                $subscription_lengths['year'][6] = WC_Subscriptions_Manager::get_subscription_period_strings( 6, 'year' );
                $subscription_lengths['year'][7] = WC_Subscriptions_Manager::get_subscription_period_strings( 7, 'year' );
                $subscription_lengths['year'][8] = WC_Subscriptions_Manager::get_subscription_period_strings( 8, 'year' );
                $subscription_lengths['year'][9] = WC_Subscriptions_Manager::get_subscription_period_strings( 9, 'year' );
                $subscription_lengths['year'][10] = WC_Subscriptions_Manager::get_subscription_period_strings( 10, 'year' );

                return $subscription_lengths;
        }
	add_filter( 'woocommerce_subscription_lengths', 'eg_extend_subscription_lengths' );