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70 lines
1.9 KiB
Markdown
70 lines
1.9 KiB
Markdown
# When to hook in WordPress?
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See https://codex.wordpress.org/Plugin_API/Action_Reference
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:bulb: Always hook the latest possible action.
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## Earliest time to use `add_filter` and `add_action`
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- **Not** when plugin's main file or the themes's `functions.php` file is being loaded!
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- Plugins at `plugins_loaded`
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- Theme's `functions.php` file is loaded just before `after_setup_theme`
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- Generally at `init`
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```php
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add_action('plugins_loaded', 'myprefix_add_hooks', 10, 0);
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```
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## Unconditional hooking
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- `register_activation_hook()`
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- `register_post_type()`
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## Based on HTTP request type
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- Core request type (entry points and routes),
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see [template hierarchy](https://wphierarchy.com/) and
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[`Toolkit4WP\Is::request()`](https://github.com/szepeviktor/Toolkit4WP/blob/master/src/Is.php#L64-L117)
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- Plugin and themes request types (e.g. AMP pages, XML sitemap)
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:bulb: Anonymous visitors include ones with JS disabled,
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robots, attackers and pull CDN.
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## Conditional Tags
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See https://codex.wordpress.org/Conditional_Tags
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- Post type `is_singular($cpt)`
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- Page template
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- Archives
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## On admin pages
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- Current admin page, see https://codex.wordpress.org/Plugin_API/Action_Reference/load-(page)
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- Logged in users with core roles
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- Custom roles
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:bulb: `is_admin()` includes `wp_doing_ajax()`!
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## In development
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- Based on `WP_DEBUG`
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- Based on environment name from `WP_ENV`
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## HTTP Request variables
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GET and POST variables.
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:bulb: Best to avoid direct request variable access.
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## Login requests
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- `register` GET, POST
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- `login` GET, POST
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- `logout` GET
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- `lostpassword` (was `retrievepassword`) GET, POST
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- `rp` GET, `resetpass` POST
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- `confirm_admin_email` GET _every six months after an admin has logged in_
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- `postpass` POST _password protected posts_
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- `confirmaction` GET _multisite account activation_
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- `WP_Recovery_Mode_Link_Service::LOGIN_ACTION_ENTERED` GET, POST?
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