What You Can Build With CARL Include Files
Because include files can contain any valid PHP and HTML, they're not just for navigation and footers. They're a full application injection point. Anything that runs on PHP can be deployed to a CARL page via an include file, without a plugin, third-party service, or recurring subscription.
Lead Generation Forms
A multi-step quote form, a contact form, a callback request widget — all of these can be built as include files and placed on any page. The form submits to a PHP processor on your server, which handles validation, stores the lead, sends a notification email, and redirects back with a success or error status. The entire flow runs on your own hosting account with no external dependency.
Two real examples: a 4-step moving company quote form that walks visitors through their contact details, pickup address, destination, and photo uploads, with client-side step validation and a progress indicator. And a pest control service request form with a honeypot field for spam protection and a direct post to a leads processor on a subdomain.
Both are self-contained include files. No WPForms license. No Gravity Forms subscription. No form builder account.
Booking and Appointment Widgets
A service business that needs a booking form can build one as an include file: date picker, time slot selection, service type, contact fields, and a submission handler that writes to the database and sends a confirmation email. Place it on a service page, a landing page, or a dedicated booking page. Update the available time slots by editing one file.
Price Calculators and Estimators
A calculator that takes user inputs and returns a price estimate is a natural fit for an include file. The logic runs in JavaScript on the client side, or in PHP if the calculation requires server-side data. Either way, the whole thing lives in a single file that can be included on any page.
Promotional Banners and Announcements
A site-wide promotional banner — a sale, a deadline, a new product announcement — can be managed through a single include file. Add it to your template, set it live, and it appears on every page instantly. When the promotion ends, remove the content from the file and run a bulk regeneration. No plugin toggle. No widget management screen. One file edit.
The WordPress Comparison
WordPress users solve these problems with plugins: WPForms or Gravity Forms for lead capture, a booking plugin for appointments, a calculator plugin for estimators, and a notification bar plugin for banners. Each plugin is a subscription, a potential conflict, and a door into your site controlled by someone else. CARL users write PHP. The functionality is identical. The cost and the risk are not.
