Change expiration level text and display number of days left

change_expiration_level_text.php

<?php
function change_text_for_pmpro_renewal( $text, $level ) {
 
      // check if user is logged in else bail.
    if( !is_user_logged_in() ) {
        return $text;
    }

    global $current_user;
    $membership = $current_user->membership_level;
    
    // if logged in user doesn't have a membership level, bail.
    if ( empty( $membership ) ) {
    return $text;
    }

    $today = date( "d-m-Y" ); //get today's date

    $user_enddate = $membership->enddate;

    // If the user doesn't have an enddate set, bail.
    if ( empty( $user_enddate ) ) {
       return $text;
    }

    $days_left = ( $user_enddate - strtotime( $today ) ) / 86400;
    // user is renewing.
     if( $membership->ID == $level->id ) {
        $text = 'You have ' . $days_left . ' days left on your plan. Once you renew, your membership will expire in ' . $level->expiration_number . ' ' . $level->expiration_period .'s.';
    }
    return $text;
}
add_filter( 'pmpro_level_expiration_text', 'change_text_for_pmpro_renewal', 20, 2 );