Customization: Prorated Expiring membership for @ajac036

aja-pmpro-customizations.php

<?php
/*
Plugin Name: PMPro Customizations: Membership proration
Plugin URI: https://eighty20results.com/paid-memberships-pro/do-it-for-me/
Description: Prorate price for Level ID 5 memberships based on month of the year when the user signs up
Version: 1.0
Author: Eighty / 20 Results by Wicked Strong Chicks, LLC <thomas@eighty20results.com>
Author URI: https://eighty20results.com/thomas-sjolshagen/
License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
License: GPLv2 or later

 * Copyright (C) 2017  Thomas Sjolshagen - Eighty / 20 Results by Wicked Strong Chicks, LLC
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

class ajaCustomizations {
	
	/**
	 * @var null|ajaCustomizations
	 */
	private static $instance = null;
	
	/**
	 * ajaCustomizations constructor.
	 *
	 * @access private
	 */
	private function __construct() {
	}
	
	/**
	 * Configure the membership level price, based on the checkout month.
	 *
	 * User signs up in September: Pay 120.00
	 * User signs up in October: Pay 110.00
	 * User signs up any other month: Pay 100.00
	 *
	 * @param stdClass $level
	 *
	 * @return stdClass
	 */
	public function configure_checkout_level( $level ) {
		
		if ( isset($level->id) && 5 === intval( $level->id ) ) {
			
			$this_month = date_i18n( 'n', current_time( 'timestamp' ) );
			
			// Set amount based on which month it is when the user is signing up for this level (level 5)
			switch ( $this_month ) {
				case 9:
					$level->initial_payment = 120.00;
					break;
				case 10:
					$level->initial_payment = 110.00;
					break;
				default:
					$level->initial_payment = 100.00;
			}
		}
		return $level;
	}
	
	/**
	 * Load required action hooks / filter hooks
	 */
	public function load_hooks() {
		
		add_filter( 'pmpro_checkout_level', array( $this, 'configure_checkout_level' ), 10, 1 );
	}
	
	/**
	 * Initialize the class & return instance
	 *
	 * @return ajaCustomizations|null
	 */
	public static function get_instance() {
		
		if ( is_null( self::$instance ) ) {
			self::$instance = new self;
			self::$instance->load_hooks();
		}
		
		return self::$instance;
	}
}