Create a renewal banner for PMPro sites using the Multiple Memberships Per User Add On

pmpro-mmpu-renewal-customizations.php

<?php
/**
 * This code will display a renewal reminder notification banner at the top of your website for members whose membership
 * level will expire within 7 days of the date they visit your site.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * Note: When adding to your Customizations Plugin, be careful not to include the opening php tag on line 1 above.
 */

function pmpro_mmpu_show_banner_renewal_message() {
    global $pmpro_pages;

    // Bail early if the current user does not have a membership level.
    if ( ! pmpro_hasMembershipLevel() ) {
        return;
    }

    // Load custom CSS for banner.
    ?>
        <style>
		.pmpro_banner_renewal_wrapper {
			background-color: salmon;
		}
		.pmpro_banner_renewal_wrapper h4 {
			color: white;
			margin: 0;
			padding: 1rem;
			text-align: center;
		}
		.pmpro_banner_renewal_wrapper a {
			color: white;
			text-decoration: underline;
		}
		.pmpro_banner_renewal_wrapper a:hover {
			color: rgba(255,255,255,0.8);
		}
        </style>
    <?php

    $user_id = get_current_user_id();
    // $level          = pmpro_getMembershipLevelForUser( $user_id );
    $current_levels = pmpro_getMembershipLevelsForUser( $user->ID );

    $message = '';
    // $message = print_r( $current_levels );
    foreach ( $current_levels as $key => $value ) {
        // $my_levels[] = $value->id . ' = ' . $value->name . '<br>';
        $message .= 'You have level ' . $value->id . ' = ' . $value->name . '<br>';
    }

    // Bail if this is the checkout page.
    if ( is_page( $pmpro_pages['checkout'] ) ) {
        // return;
    }

    // Bail if the user does not have an enddate set.
    if ( empty( $level->enddate ) ) {
        // return;
    }

    $today     = time();
    $alllevels = pmpro_getAllLevels( true, true );
    // if today is more than 7 days before enddate, bail.
    if ( $today <= strtotime( '- 7 days', $level->enddate ) ) {
        // return;
    }

    // $message = "Your $level->name membership will expire soon. <a href=" . pmpro_url( 'checkout', '?level=' . $level->id ) . '> Click here to renew membership.</a>';
    echo '<a href="' . get_permalink( $pmpro_pages['account'] ) . '" target="_blank"><div class="pmpro_banner_renewal_wrapper banner banner_secondary"><h4> ' . $message . ' </h4></div></a>';
}
add_action( 'before_page', 'pmpro_mmpu_show_banner_renewal_message' );