Overview

WordPress itself is not fully built using Object-Oriented Programming (OOP); it primarily relies on procedural PHP. However, to provide more flexibility and maintainability in our projects, we’ve implemented several core functions using OOP principles.

These classes are located in functions/framework/classes/ and are autoloaded via a class map in index.php. They handle everything from registering custom post types to composing ACF fields, managing AJAX requests, and controlling the admin interface.

All classes are driven by config arrays defined in functions/project/config/. The Core class reads these configs and passes them to each class automatically. See The Functions Directory for the full configuration flow.

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Class Reference

Core Registration

Class	Config File	Purpose
Custom Post Type	post-types_config.php	Register CPTs with Terra extensions (hide permalink, redirect, custom columns)
Custom Taxonomy	taxonomy_config.php	Register custom taxonomies
Custom API Endpoint	endpoint_config.php	Register REST API endpoints with validation and sanitization
AJAX Request	ajax_config.php	Secure AJAX handlers with nonce verification and sanitization
Custom Blocks	custom-blocks_config.php	Register custom ACF Gutenberg blocks with automatic field registration

ACF & Flexible Content

Class	Config File	Purpose
ACF Builder	—	Island-based field composition (the core pattern for defining ACF fields)
Flexible Content	flexible-modules/, flexible-heros/	Register Flexible Content field groups from config arrays
Post Type Fields	post-type-fields_config.php	Attach ACF field groups to post types, templates, and taxonomy terms
Options Page	general-options/	Register ACF Options Pages with tabbed layout
WYSIWYG Toolbars	wysiwyg-toolbars_config.php	Custom TinyMCE toolbar presets for WYSIWYG fields

Admin Interface

Class	Config File	Purpose
Admin Controller	admin-controller_config.php	Hide metaboxes and redirect after save per template/post type
Admin Page	admin-pages_config.php	Register custom admin submenu pages under the Terra menu
Manage Columns	—	Custom columns in admin post lists

Monitoring & Tools

Class	Config File	Purpose
Cronjob	—	Schedule WP cron jobs
Mail	—	Send HTML emails via wp_mail
Lighthouse	—	Performance monitoring with Lighthouse API
Schema Builder	—	Visual JSON-LD structured data builder with Vue admin interface
System Warning	—	Admin monitoring dashboard for health checks and performance alerts
Module Manager	—	Feature flag system to enable or disable framework modules per project
Search Flexible Modules	—	Audit which ACF modules appear on which pages