Get PMPro WooCommerce to work with PMPro Set Expiration Dates

my_pmprowoo_checkout_level.php

<?php   // do not copy this line.
/**
 * Get PMPro WooCommerce to work with PMPro Set Expiration Dates
	
 *  Mostly assumes annually expiring levels. Use at your own risk.
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmprowoo_checkout_level($level_array)
{	
	if(!function_exists('pmpro_getSetExpirationDate'))
		return $level_array;
	
	global $wpdb;
	
	//does this level have a set expiration date?
	$set_expiration_date = pmpro_getSetExpirationDate($level_array['membership_id']);
	
	if(!empty($set_expiration_date))
	{
		//replace vars
		$now = current_time("timestamp");
		$Y = date("Y", $now);
		$Y2 = intval($Y) + 1;
		$M = date("m", $now);		
		if($M == 12)
			$M2 = "01";
		else
			$M2 = str_pad(intval($M) + 1, 2, "0", STR_PAD_LEFT);
		$searches = array("Y-", "Y2-", "M-", "M2-");
		$replacements = array($Y . "-", $Y2 . "-", $M . "-", $M2 . "-");
		
		$set_expiration_date = str_replace($searches, $replacements, $set_expiration_date);
		
		//need to extend?
		if(pmpro_hasMembershipLevel($level_array['membership_id'], $level_array['user_id']))
		{
			//what's the user's current enddate
			$current_enddate = $wpdb->get_var("SELECT enddate FROM $wpdb->pmpro_memberships_users WHERE user_id = '" . $level_array['user_id'] . "' AND membership_id = '" . $level_array['membership_id'] . "' AND status = 'active' LIMIT 1");
						
			if(!empty($current_enddate))
			{				
				//get info for level
				$pmpro_level = pmpro_getLevel($level_array['membership_id']);
				
				//need timestamp for current end date
				$current_enddate_ts = strtotime($current_enddate, $now);								
				
				//extend based on when the enddate is
				if(date("Y-m-d", $current_enddate_ts) == $set_expiration_date)
				{
					//expiration date is already the set date, just push it out one cycle
					$set_expiration_date = date("Y-m-d", strtotime($set_expiration_date . " +" . $pmpro_level->expiration_number . " " . $pmpro_level->expiration_period, $now));	
				}
				elseif($current_enddate_ts > strtotime($set_expiration_date, $now))
				{
					//expires after this day? fix date and push it out one more cycle
					$ex_year = date("Y", $current_enddate_ts);
					$ex_month = date("m", $current_enddate_ts);
					$ex_day = date("d", $current_enddate_ts);
					
					$set_year = date("Y", strtotime($set_expiration_date, $now));
					$set_month = date("m", strtotime($set_expiration_date, $now));
					$set_day = date("d", strtotime($set_expiration_date, $now));
					
					//if before set monday/day, keep year + set month/day
					if($ex_month < $set_month || ($ex_month = $set_month && $ex_day < $set_day))
					{
						$set_expiration_date = $ex_year . "-" . $set_month . "-" . $set_day;												
					}
					else
					{
						//if after set month/day, use ex year and set month/day + cycle period
						$set_expiration_date = date("Y-m-d", strtotime($ex_year . "-" . $set_month . "-" . $set_day . " +" . $pmpro_level->expiration_number . " " . $pmpro_level->expiration_period, $now));						
					}
				}
			}
			
		}						
		
		$level_array['enddate'] = $set_expiration_date;
	}
		
	return $level_array;
}
add_filter('pmprowoo_checkout_level', 'my_pmprowoo_checkout_level', 20);