masked usernames - pick number lottery

<?php
/**
 * Lottery history tab template - masked usernames for Pick Number Mod addon
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/single-product/tabs/lottery-history.php
 *
 */

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

global $woocommerce, $post, $product;

$lottery_winers = get_post_meta($post->ID, '_lottery_winners');
$users_names = '';
$use_answers = wc_lottery_use_answers( $post->ID );
$use_ticket_numbers = get_post_meta( $post->ID , '_lottery_use_pick_numbers', true );
$answers = maybe_unserialize( get_post_meta( $post->ID, '_lottery_pn_answers', true ) );
$date_format = get_option( 'date_format' );
$time_format = get_option( 'time_format' );

?>

<h2><?php echo esc_html( __( 'Lottery History', 'wc-lottery-pn' ) ); ?></h2>


<?php if(($product->is_closed() === TRUE ) and ($product->is_started() === TRUE )) : ?>

    <p><?php _e('Lottery has finished', 'wc-lottery-pn') ?></p>
    <?php if ($product->get_lottery_fail_reason() == '1'){
         _e('Lottery failed because there were no minimal number of participants', 'wc-lottery-pn');
    } else{

        if ( count($lottery_winers) > 1 ) { ?>

           <p><?php _e('Lottery winners are', 'wc-lottery-pn') ?>: <?php foreach ($lottery_winers as $winner_id) {
            if( intval( $winner_id ) > 0) {

                    $dname = get_userdata($winner_id)->display_name;
                    $length1      = strlen( $dname );
                    $dname = $dname[0] . str_repeat( '*', $length1 - 2 ) . $dname[ $length1 - 1 ];


                    $users_names .= "<span>";
                    $users_names .= $dname;
                    $users_names .= "</span>, ";
                }
            } ?><?php echo rtrim( $users_names , ', '); ?></p>

        <?php } elseif( count($lottery_winers) === 1 ) {
            $winner = reset($lottery_winers);

            if ( ! empty ( $winner ) ) { ?>
            <p><?php _e('Lottery winner is:', 'wc-lottery-pn') ?> <span><?php echo get_userdata($winner)->display_name ?></span></p>
        <?php }
        }
    } ?>

<?php endif; ?>

<table>
    <thead>
        <tr>
            <th><?php _e('Date', 'wc-lottery-pn') ?></th>
            <th><?php _e('User', 'wc-lottery-pn') ?></th>
            <?php if ($use_ticket_numbers === 'yes' ) :?>
                <th><?php _e('Ticket number', 'wc-lottery-pn') ?></th>
            <?php endif; ?>
            <?php if ($use_answers === true && 'yes' === get_option('lottery_answers_in_history', 'yes')  && ( 'no' === get_option('lottery_answers_in_history_finished', 'no') || $product->is_closed() === TRUE ) ) :?>
                <th><?php _e('Answer', 'wc-lottery-pn') ?></th>
            <?php endif; ?>
        </tr>
    </thead>
    <?php
        $lottery_history = $product->lottery_history();

        if( $lottery_history ) {

            foreach ($lottery_history as $history_value) {

                if ($history_value->userid){
                    $dname = get_userdata($history_value->userid)->display_name;
                    $length1      = strlen( $dname );
                    $dname = $dname[0] . str_repeat( '*', $length1 - 2 ) . $dname[ $length1 - 1 ];
                }

                echo "<tr>";
                echo "<td class='date'>".date_i18n( $date_format, strtotime( $history_value->date )).' '.date_i18n( $time_format, strtotime( $history_value->date ))."</td>";
                echo $history_value->userid ? "<td class='username'>". $dname ."</td>" : '';

                if ($use_ticket_numbers === 'yes' ) {
                    echo "<td class='ticket_number'>" . apply_filters( 'ticket_number_display_html' , $history_value->ticket_number, $product ) . "</td>";
                }

                if ( $use_answers === true && 'yes' === get_option('lottery_answers_in_history', 'yes')  && ( 'no' === get_option('lottery_answers_in_history_finished', 'no') || $product->is_closed() === TRUE ) ){
                    $answer = isset( $answers[$history_value->answer_id] ) ? $answers[$history_value->answer_id] : false;

                    echo "<td class='answer'>";
                    echo $answer !== true ? $answer['text'] : "" ;
                    echo "</td>";
                }

                echo "</tr>";
            }

        }
    ?>
    <tr class="start">
            <?php

            $lottery_dates_to = $product->get_lottery_dates_from();


            if ($product->is_started() === TRUE ){
                echo '<td class="date">'.date_i18n( $date_format,  strtotime( $lottery_dates_to )).' '.date_i18n( $time_format,  strtotime( $lottery_dates_to )).'</td>';
                echo '<td class="started">';
                esc_html_e( 'Lottery started', 'wc-lottery-pn' );
                echo '</td>';

            } else {
                echo '<td class="date">'.date_i18n( $date_format,  strtotime( $lottery_dates_to )).' '.date_i18n( $time_format,  strtotime( $lottery_dates_to )).'</td>';
                echo '<td class="starting">';
                esc_html_e( 'Lottery starting', 'wc-lottery-pn' );
                echo '</td>' ;
            }?>
    </tr>
</table>