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Semantic Hybrid Search for WordPress + ACF + OpenAI

Description

This WordPress plugin enables semantic search capabilities by combining traditional SQL FULLTEXT search with OpenAI embeddings for intelligent content discovery. It supports both standard WordPress content and Advanced Custom Fields (ACF).

Features

• Hybrid Search: Combines keyword-based and semantic search
• OpenAI Integration: Uses OpenAI embeddings for semantic understanding
• ACF Support: Searches through Advanced Custom Fields
• REST API: Provides endpoints for AJAX-based search
• Admin Panel: Easy configuration and batch reindexing tools
• Batch Processing: AJAX-based reindexing prevents server timeouts with large post counts

Requirements

• WordPress >= 6.0
• PHP >= 8.0
• MySQL >= 5.7
• OpenAI API key

Installation

1. Upload the plugin files to /wp-content/plugins/ihumbak-semantic-search/
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Configure your OpenAI API key in Settings > Semantic Search OR add it to wp-config.php:

   define( 'IHUMBAK_SEMANTIC_SEARCH_OPENAI_KEY', 'your-api-key-here' );

4. Run the initial indexing

Configuration

OpenAI API Key

You can configure the OpenAI API key in two ways:

1. Via wp-config.php (Recommended for production):

   define( 'IHUMBAK_SEMANTIC_SEARCH_OPENAI_KEY', 'sk-...' );

2. Via Settings Page: Go to Settings > Semantic Search and enter your API key in the settings form.

Note: If the constant is defined in wp-config.php, it will take precedence over the settings page option.

Usage

Shortcode

Add the search form to any post or page:

[semantic_search]

With custom attributes:

[semantic_search 
    placeholder="Search..." 
    limit="10" 
    post_type="post,page" 
    mode="hybrid"
    show_excerpt="yes"
    show_thumbnail="no"
]

See FRONTEND_GUIDE.md for complete shortcode documentation.

Widget

1. Go to Appearance > Widgets
2. Add the Semantic Search widget to your sidebar
3. Configure the widget settings

REST API

GET /wp-json/semantic-search/v1/search?q=your+query

Parameters:

• q (required): Search query
• limit (optional): Number of results, default 10
• post_type (optional): Comma-separated post types, default "post,page"
• mode (optional): "hybrid", "keyword", or "semantic", default "hybrid"

Reindexing Posts

The plugin provides an AJAX-based batch reindexing feature to handle large numbers of posts without server timeouts:

1. Go to Settings > Semantic Search
2. Click the Reindex All Posts button
3. The reindexing process will run in batches, showing a progress bar
4. You can cancel the process at any time

The reindexing processes posts in batches of 10 by default, with each batch completing before the next one starts. This prevents server timeouts and provides real-time progress updates.

Development

Setup

composer install
npm install

Build

npm run build

Testing

composer test
composer lint
composer stan

License

GPL-2.0-or-later

Author

Michal Staniecko - ihumbak.com