randomly assign tickets with limited number of letters

/*

use only 5 letters

*/
add_action( 'template_redirect', 'custom_use_alphabet', 100 );
add_action( 'woocommerce_product_options_lottery', 'custom_use_alphabet', 100 );
add_action( 'export_lottery_history_with_extra_info','custom_use_alphabet', 100 );

function custom_use_alphabet( $post_id = false ){

    if( is_product() || is_admin() ){
        $post_id = !$post_id ? get_the_ID() : $post_id;
        if( get_post_meta( $post_id , '_lottery_pick_number_alphabet', true ) === 'yes' ){
            global $wc_lottery_pn;
            remove_filter( 'ticket_number_display_html', array( $wc_lottery_pn->plugin_public, 'change_ticket_numbers_to_alphabet'), 10 );
            remove_filter( 'ticket_number_tab_display_html', array( $wc_lottery_pn->plugin_public, 'change_ticket_tab_to_alphabet'), 10 );
            add_filter( 'ticket_number_display_html', 'custom_change_ticket_numbers_to_alphabet', 10, 2 );
            //add_filter( 'ticket_number_tab_display_html', 'custom_change_ticket_numbers_to_alphabet', 10, 2 );
        }
    }
}


function custom_change_ticket_numbers_to_alphabet( $ticket_number, $product ){

    $_ticket_number = $ticket_number;
    if( ! $product || !$ticket_number ) {
        return $ticket_number;
    }
    $max_tickets = intval( $product->get_max_tickets() );
    $tabnumbers = get_post_meta( $product->get_id() , '_lottery_pick_number_tab_qty', true );
    $tabnumbers = $tabnumbers ? intval( $tabnumbers )  : 100;
    if ( $max_tickets > $tabnumbers * 5 ){
        $tabnumbers = ceil ( $max_tickets / 5 );
    }
    $tabnumbers == apply_filters( 'lottery_numbers_to_alphabet_number_per_letter', $tabnumbers );
    $alphabet = range('A', 'E');
    $in =  ( intval(( $ticket_number - 1 ) /$tabnumbers ) );
    if($in > 0 ){
        $ticket_number = $ticket_number - ( $tabnumbers * $in );
    }
    $is_100 = $ticket_number % 100;
    if ($ticket_number === '00' &&  $is_100 === 0  ){
        $ticket_number = '100';
    }
    $ticket_number = ltrim($ticket_number, 0 );
    if( isset( $alphabet[$in] ) ){
        $ticket_number = $alphabet[$in].$ticket_number;
    } else {
        return $_ticket_number;
    }

    return $ticket_number;
}