Need help for some PHP code

I've already set all the fields in my theme settings but I want that carousel-items class repeats whenever I add slides to it, and [0] changes to [1],[2],...

div class=carousel-items
                    a href=?php echo website_TDU; ?/single.html
                        div class=carousel-main-image
                            img src=?php echo $main_slider[2] ['main_slider_main_image']; ? alt=
                        /div
                        div class=carousel-more-info
                            div class=game-name?php echo $main_slider[2] ['main_slider_title']; ?/div
                            div class=screenshots
                                div style=background-image: url('?php echo $main_slider[2] ['main_slider_thumbnails1']; ?');/div
                                div style=background-image: url('?php echo $main_slider[2] ['main_slider_thumbnails2']; ?');/div
                                div style=background-image: url('?php echo $main_slider[2] ['main_slider_thumbnails3']; ?');/div
                                div style=background-image: url('?php echo $main_slider[2] ['main_slider_thumbnails4']; ?');/div
                            /div
                            div class=carousel-region
                                h4span class=badge bg-secondary10/span/h4
                                h4span class=badge bg-secondary20/span/h4
                            /div
                            div class=carousel-product-price
                                div class=carousel-discount
                                    span?php echo $main_slider[2] ['main_slider_percent']; ?/span
                                /div
                                span class=carousel-last-price
                                ?php echo $main_slider[2] ['main_slider_last_price']; ?
                                /span
                                span class=carousel-special-price
                                ?php echo $main_slider[2] ['main_slider_current_price']; ?
                                /span
                                i class=fab fa-windows/i
                            /div
                        /div
                    /a
                /div