99 lines
2.7 KiB
Markdown
99 lines
2.7 KiB
Markdown
# Common WordPress Hooks Reference
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Quick reference for the most commonly used WordPress hooks in plugin development.
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---
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## Action Hooks
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### Plugin Lifecycle
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| Hook | When It Fires | Use For |
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|------|--------------|---------|
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| `plugins_loaded` | After all plugins loaded | Init plugin functionality |
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| `init` | WordPress initialization | Register post types, taxonomies |
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| `admin_init` | Admin initialization | Register settings |
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| `wp_loaded` | WordPress fully loaded | Late initialization |
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### Admin Hooks
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| Hook | When It Fires | Use For |
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|------|--------------|---------|
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| `admin_menu` | Admin menu creation | Add admin pages |
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| `admin_enqueue_scripts` | Admin assets loading | Enqueue admin CSS/JS |
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| `admin_notices` | Admin notices display | Show admin messages |
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| `save_post` | After post saved | Save custom data |
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| `add_meta_boxes` | Meta boxes registration | Add meta boxes |
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### Frontend Hooks
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| Hook | When It Fires | Use For |
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|------|--------------|---------|
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| `wp_enqueue_scripts` | Frontend assets loading | Enqueue CSS/JS |
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| `wp_head` | In `<head>` section | Add meta tags, styles |
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| `wp_footer` | Before `</body>` | Add scripts, analytics |
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| `template_redirect` | Before template loaded | Redirects, custom templates |
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| `the_content` (filter) | Post content display | Modify post content |
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### AJAX Hooks
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| Hook | Use For |
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|------|---------|
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| `wp_ajax_{action}` | Logged-in AJAX |
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| `wp_ajax_nopriv_{action}` | Public AJAX |
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### REST API
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| Hook | When It Fires | Use For |
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|------|--------------|---------|
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| `rest_api_init` | REST API init | Register REST routes |
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---
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## Filter Hooks
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### Content Filters
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| Hook | What It Filters | Common Use |
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|------|----------------|------------|
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| `the_content` | Post content | Add/modify content |
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| `the_title` | Post title | Modify titles |
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| `the_excerpt` | Post excerpt | Customize excerpts |
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| `comment_text` | Comment text | Modify comments |
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### Query Filters
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| Hook | What It Filters | Common Use |
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|------|----------------|------------|
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| `pre_get_posts` | Query before execution | Modify queries |
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| `posts_where` | SQL WHERE clause | Custom WHERE |
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| `posts_orderby` | SQL ORDER BY | Custom sorting |
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### Admin Filters
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| Hook | What It Filters | Common Use |
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|------|----------------|------------|
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| `manage_{post_type}_posts_columns` | Admin columns | Add columns |
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| `admin_footer_text` | Admin footer text | Custom footer |
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---
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## Hook Priority
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Default priority is `10`. Lower numbers run first.
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```php
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// Runs early (priority 5)
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add_action( 'init', 'my_function', 5 );
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// Runs late (priority 20)
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add_action( 'init', 'my_other_function', 20 );
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```
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---
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## Resources
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- **Hook Reference**: https://developer.wordpress.org/reference/hooks/
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- **Plugin API**: https://codex.wordpress.org/Plugin_API
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