Create a banner that will display a message to soon to be expiring members

pmpro-expire-soon-banner.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_show_banner_renewal_message(){

    // 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{
                width:100%;
                height:4rem;
                background-color:salmon;
            }

            .pmpro_banner_renewal_wrapper h4{
                text-align:center;
                color:white;
                padding:1rem;    
            }

            .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 );

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

    // 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 '<div class="pmpro_banner_renewal_wrapper"><h4> ' . $message . ' </h4></div>';

}
add_action( 'wp_head', 'pmpro_show_banner_renewal_message' );