需要为没有主题文件夹的wordpress站点创建自定义php页面

I am new to WP, so please excuse if I ask anything silly. I have WordPress site which have that created using builder and doesn't use page template of theme folder, everything is built on page builder. I also have other project that I've created on core php.

Is there a way to integrate Core PHP website with Wordpress website?

Creating a Page Template Creating a page template is extremely easy. Create any new file in your theme (wp-content/themes/your-theme/my-custom-page.php) and start the file with a comment block like so:

<?php
    /*
        Template Name: My Awesome Custom Page
    */
    get_header();
?>

/*
    Code Here
*/

<?php
    get_footer();
?>

You need paste php code inside this template file. When you submit for then redirection action will be page with custom template page.

Reference :

https://premium.wpmudev.org/blog/creating-custom-page-templates-in-wordpress/

Video : https://youtu.be/1ZdHI8HuboA