Add custom field for pmpro_member shortcode that display the user's level(s) and their expiration date(s)

my_pmpro_member_shortcode_custom_field_1669295230000.php

<?php
/**
 * This recipe adds the custom field my_memberships to the [pmpro_member] shortcode
 * that will display a user's membership level(s) and expiration date(s).
 *
 * Supports Multiple Memberships Per User (MMPU) Add On to display all the user's membership levels.
 *
 * Example Usage of [pmpro_member field="my_memberships"]
 * Membership Level: Starter
 * Membership Expires: Never
 *
 * Membership Level: One Month
 * Membership Expires: December 24, 2023
 *
 * Membership Level: Monthly
 * Membership Expires: Recurring Until Cancelled
 *
 * 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_pmpro_member_shortcode_custom_field_1669295230000( $r, $user_id, $field ) {

	// Check if the field is the one we want to modify.
	if ( 'my_memberships' !== $field ) {
		return $r;
	}

	// Get all the user's membership levels and display the level name and expiration date for each level they have.
	$levels = pmpro_getMembershipLevelsForUser( $user_id );
	if ( ! empty( $levels ) ) {
		$r = '';
		foreach ( $levels as $level ) {
			if ( ! empty( $level->enddate ) ) {
				$enddate = date_i18n( get_option( 'date_format' ), $level->enddate );
			} else {
				if ( pmpro_isLevelFree( $level ) ) {
					$enddate = 'Never';
				} else {
					$enddate = 'Recurring Until Cancelled';
				}
			}
			$r .= 'Membership Level: ' . $level->name . '<br />Membership Expires: ' . $enddate . '<br /><br />';
		}
	}

	return $r;
}
add_filter( 'pmpro_member_shortcode_field', 'my_pmpro_member_shortcode_custom_field_1669295230000', 10, 3 );