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readme.md

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+# Vincent's Under Construction
+
+A simple WordPress plugin that allows you to display an under construction page while your site is being developed or updated.
+
+## Description
+
+Vincent's Under Construction is a lightweight WordPress plugin that enables you to easily set up an "under construction" or "coming soon" page for your website. When activated, it redirects all non-logged-in users to a specified page, allowing you to work on your site without interruption.
+
+## Features
+
+- Easy to use admin interface
+- Select any page as your under construction page
+- Redirect all non-logged-in users to the under construction page
+- Logged-in users can still access the entire site
+- Settings link directly from the plugins page
+
+## Installation
+
+1. Download the plugin zip file
+2. Log in to your WordPress admin panel
+3. Go to Plugins > Add New
+4. Click on the "Upload Plugin" button
+5. Upload the zip file you downloaded
+6. Activate the plugin through the 'Plugins' menu in WordPress
+
+## Usage
+
+1. After activation, go to the "Under Construction" menu item in your WordPress admin panel
+2. Check the box to enable the under construction mode
+3. Select the page you want to use as your under construction page from the dropdown menu
+4. Save your settings
+
+## Requirements
+
+- WordPress 4.0 or higher
+- PHP 5.6 or higher
+
+## Frequently Asked Questions
+
+**Q: Can logged-in users see the full site?**
+A: Yes, logged-in users will have full access to the site.
+
+**Q: Can I customize the under construction page?**
+A: Yes, you can create and design any page in WordPress and set it as your under construction page.
+
+## Changelog
+
+### 1.1
+- Added success alerts when settings are saved
+- Improved settings sanitization
+- Added settings link on plugins page
+
+### 1.0
+- Initial release
+
+## Support
+
+For support, feature requests, or bug reports, please open an issue on the [GitHub repository](https://github.com/your-github-username/vincents-under-construction).
+
+## License
+
+This project is licensed under the GPL v2 or later.
+
+## Author
+
+Vincent Rozenberg
+- Website: [https://vincentrozenberg.com](https://vincentrozenberg.com)
+- GitHub: [@vincentrozenberg](https://github.com/vincentrozenberg)
+
+## Contributing
+
+Contributions are welcome! Please feel free to submit a Pull Request.

vincent-under-construction.php

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+<?php
+/*
+Plugin Name: Vincent's Under Construction
+Description: Displays an under construction page when activated.
+Version: 1.1
+Author: Vincent Rozenberg
+Author URI: https://vincentrozenberg.com
+*/
+
+// Add admin menu
+function suc_add_admin_menu() {
+    add_menu_page('Under Construction', 'Under Construction', 'manage_options', 'simple-under-construction', 'suc_admin_page');
+}
+add_action('admin_menu', 'suc_add_admin_menu');
+
+// Create admin page
+function suc_admin_page() {
+    $options = get_option('suc_settings');
+    ?>
+    <div class="wrap">
+        <h1>Under Construction Settings</h1>
+        <?php
+        // Display settings updated message
+        if (isset($_GET['settings-updated'])) {
+            ?>
+            <div class="notice notice-success is-dismissible">
+                <p><strong>Settings saved.</strong></p>
+            </div>
+            <?php
+        }
+        ?>
+        <form method="post" action="options.php">
+            <?php
+            settings_fields('suc_settings_group');
+            do_settings_sections('simple-under-construction');
+            submit_button();
+            ?>
+        </form>
+    </div>
+    <?php
+}
+
+// Register settings
+function suc_register_settings() {
+    register_setting('suc_settings_group', 'suc_settings', 'suc_sanitize_settings');
+    add_settings_section('suc_main_section', 'Main Settings', null, 'simple-under-construction');
+    
+    add_settings_field('suc_enabled', 'Enable Under Construction', 'suc_enabled_callback', 'simple-under-construction', 'suc_main_section');
+    add_settings_field('suc_page', 'Under Construction Page', 'suc_page_callback', 'simple-under-construction', 'suc_main_section');
+}
+add_action('admin_init', 'suc_register_settings');
+
+// Sanitize and validate input
+function suc_sanitize_settings($input) {
+    $new_input = array();
+    
+    $new_input['enabled'] = isset($input['enabled']) ? 1 : 0;
+    $new_input['page'] = isset($input['page']) ? absint($input['page']) : 0;
+
+    return $new_input;
+}
+
+// Callback for enabled setting
+function suc_enabled_callback() {
+    $options = get_option('suc_settings');
+    $checked = isset($options['enabled']) ? checked($options['enabled'], 1, false) : '';
+    echo '<input type="checkbox" name="suc_settings[enabled]" value="1"' . $checked . '>';
+}
+
+// Callback for page selection
+function suc_page_callback() {
+    $options = get_option('suc_settings');
+    $pages = get_pages();
+    echo '<select name="suc_settings[page]">';
+    foreach ($pages as $page) {
+        $selected = (isset($options['page']) && $options['page'] == $page->ID) ? 'selected' : '';
+        echo '<option value="' . $page->ID . '" ' . $selected . '>' . $page->post_title . '</option>';
+    }
+    echo '</select>';
+}
+
+// Redirect to under construction page
+function suc_redirect() {
+    $options = get_option('suc_settings');
+    
+    if (isset($options['enabled']) && $options['enabled'] == 1 && !is_user_logged_in()) {
+        $under_construction_page = isset($options['page']) ? get_permalink($options['page']) : home_url();
+        
+        if (!is_page($options['page'])) {
+            wp_redirect($under_construction_page);
+            exit;
+        }
+    }
+}
+add_action('template_redirect', 'suc_redirect');
+
+// Add settings link on plugin page
+function suc_settings_link($links) {
+    $settings_link = '<a href="admin.php?page=simple-under-construction">Settings</a>';
+    array_unshift($links, $settings_link);
+    return $links;
+}
+$plugin = plugin_basename(__FILE__);
+add_filter("plugin_action_links_$plugin", 'suc_settings_link');