Create pages hierarchically based on their URL structure

wppd-importer.php

<?php
/**
 * Plugin Name: WPPD Importer
 * Plugin URI: https://www.4property.com/
 * Description: Importer.
 * Version: 0.0.1
 * Author: 4Property
 * Author URI: https://www.4property.com/
 * License: GNU General Public License v3 or later
 * License URI: https://www.gnu.org/licenses/gpl-3.0.html
 */

function wppdi_menu_links() {
    add_menu_page( 'Importer Settings', 'Importer', 'manage_options', 'wppd_importer', 'wppd_importer_build_admin_page', 'dashicons-database-import' );
}

add_action( 'admin_menu', 'wppdi_menu_links', 10 );

function wppd_importer_build_admin_page() {
    $tab     = ( filter_has_var( INPUT_GET, 'tab' ) ) ? filter_input( INPUT_GET, 'tab' ) : 'dashboard';
    $section = 'admin.php?page=wppd_importer&amp;tab=';
    ?>
    <div class="wrap">
        <h1>Importer</h1>

        <h2 class="nav-tab-wrapper nav-tab-wrapper-wppd">
            <a href="<?php echo $section; ?>dashboard" class="nav-tab <?php echo $tab === 'dashboard' ? 'nav-tab-active' : ''; ?>">Dashboard</a>

            <a href="<?php echo $section; ?>import" class="nav-tab <?php echo $tab === 'import' ? 'nav-tab-active' : ''; ?>">Import</a>
        </h2>

        <?php if ( $tab === 'dashboard' ) { ?>
            <h3>Importer <code class="codeblock"><?php echo $plugin_version['Version']; ?></code></h3>
            <?php
        } elseif ( $tab === 'import' ) {
            ?>
            <h2>Import</h2>

            <?php
            if ( isset( $_POST['save_settings'] ) ) {
                $wppdi_pages = isset( $_POST['wppdi_pages'] ) ? sanitize_textarea_field( $_POST['wppdi_pages'] ) : '';

                $wppdi_pages_to_import = array_map( 'trim', explode( PHP_EOL, $wppdi_pages ) );
                $wppdi_pages_to_import = array_unique( array_filter( $wppdi_pages_to_import ) );

                foreach ( $wppdi_pages_to_import as $wppdi_page ) {
                    $title = basename( parse_url( $wppdi_page, PHP_URL_PATH ) );

                    // Split the URL by "/"
                    $url_parts = explode('/', trim(parse_url($wppdi_page, PHP_URL_PATH), '/'));

                    // Determine the parent page ID dynamically
                    $parent_page_id = null;
                    foreach ($url_parts as $part) {
                        if ($part === '') continue; // Skip empty parts
                        $page = get_page_by_path($part, OBJECT, 'page', $parent_page_id);
                        if ($page) {
                            $parent_page_id = $page->ID;
                        } else {
                            // If a part of the URL doesn't correspond to an existing page, break the loop
                            break;
                        }
                    }

                    // Prepare the page data
                    $page_data = array(
                        'post_title'    => $title,
                        'post_content'  => 'n/a',
                        'post_status'   => 'publish',
                        'post_type'     => 'page',
                        'post_parent'   => $parent_page_id,
                    );

                    $page_id = wp_insert_post( $page_data );

                    if ( $page_id ) {
                        echo "Page created successfully: $title<br>";
                    } else {
                        echo "Failed to create page: $title<br>";
                    }
                }

                echo '<div class="updated notice is-dismissible"><p>Settings updated successfully!</p></div>';
            }
            ?>

            <p>
                <b>Notes:</b><br>
                Do not add the homepage URL<br>
            </p>

            <form method="post">
                <table class="form-table">
                    <tbody>
                        <tr>
                            <th scope="row"><label>Pages</label></th>
                            <td>
                                <p>
                                    <textarea class="large-text" rows="24" name="wppdi_pages"></textarea>
                                    <br><small>Add one or more page links (one URL per line).</small>
                                </p>
                            </td>
                        </tr>

                        <tr>
                            <th scope="row"><input type="submit" name="save_settings" class="button button-primary" value="Save Changes"></th>
                            <td></td>
                        </tr>
                    </tbody>
                </table>
            </form>
            <?php
        }
        ?>
    </div>
    <?php
}