Add the WordPress login box to the Paid Memberships Pro checkout page

pmpro-add-login-box.php

<?php // do not add to your customizations plugin
/** 
 * An extension allowing existing members to login from the main checkout page to their account to renew or update their membership.
 */

add_action( ‘pmpro_checkout_after_pricing_fields’, ‘a_little_login_thing’ );
function a_little_login_thing() {
    $label = ucwords( preg_replace( ‘/-+/‘, ’ ‘, substr( basename( __FILE__ ), 0, -4 ) ) );
    
    echo ‘<h4> The filter, <span style=“color:grey;“>’ . current_filter() . ‘</span>, calls this function: <span style=“color:grey;“>’ . __FUNCTION__ . ‘</span> on Line ’ . __LINE__ . ' of the file ' . basename( __FILE__ ) . ' in the ' . $label . ' plugin</h4>‘;//a diagnostic line you can remove 

    echo ‘<div style=“width: 66%;margin: 0 auto; border: 1rem solid grey;padding: 1rem;“>‘;
    echo ‘<h2 style=“text-align:center;color:tomato;“>Already a member? Login here.</h2>‘;
    wp_login_form();
    echo ‘</div>’;
}