returning-member-fee-change.php

<?php
/**
 * Charge the level's billing amount instead of the initial payment when an old (expired or cancelled)
 * member checks out again for the same level within a set number of years of their membership ending.
 *
 * 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/
 */

/**
 * Check if the returning member price should apply for a user checking out for a level.
 *
 * @param object $level The level being checked out for.
 * @return bool True if the user is an old member of this level within the grace period.
 */
function my_pmpro_returning_member_price_applies( $level ) {
	global $wpdb;

	// Set the level IDs this logic applies to.
	$level_ids = array( 1 );

	// Set the number of years after a membership ends that the returning member price applies.
	$years = 3;

	// Must be logged in for us to look up their old memberships.
	if ( ! is_user_logged_in() ) {
		return false;
	}

	// Only apply to the specified levels.
	if ( ! in_array( (int) $level->id, $level_ids, true ) ) {
		return false;
	}

	// Only apply to recurring levels. Otherwise, the checkout would become free.
	if ( empty( $level->billing_amount ) ) {
		return false;
	}

	// Don't apply if the user currently has this level. This is for old members only.
	if ( pmpro_hasMembershipLevel( $level->id ) ) {
		return false;
	}

	// Get the most recent end date for this user's old memberships for this level.
	$enddate = $wpdb->get_var(
		$wpdb->prepare(
			"SELECT enddate FROM $wpdb->pmpro_memberships_users
			WHERE user_id = %d
				AND membership_id = %d
				AND status IN ( 'expired', 'inactive', 'cancelled', 'admin_cancelled' )
				AND enddate IS NOT NULL
				AND enddate <> '0000-00-00 00:00:00'
			ORDER BY enddate DESC
			LIMIT 1",
			get_current_user_id(),
			$level->id
		)
	);

	// The user was never a member of this level, or we have no end date on record.
	if ( empty( $enddate ) ) {
		return false;
	}

	// Check if the membership ended within the grace period.
	return strtotime( $enddate ) >= strtotime( '-' . $years . ' years', current_time( 'timestamp' ) );
}

/**
 * Swap the initial payment for the billing amount at checkout for returning members.
 */
function my_pmpro_returning_member_checkout_level( $level ) {
	global $discount_code;

	// Let discount codes take priority.
	if ( ! empty( $discount_code ) ) {
		return $level;
	}

	if ( my_pmpro_returning_member_price_applies( $level ) ) {
		$level->initial_payment = $level->billing_amount;
	}

	return $level;
}
add_filter( 'pmpro_checkout_level', 'my_pmpro_returning_member_checkout_level' );