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====== Plugin Hooks & Filters ======

===== Core Filters =====

<code>add_filter( 'filter_name', 'function_to_call' );</code>
  * **content** Will allow you to alter or filter the //$content// variable. The function that you pass $content to should then return your results back to the system.
  * **menuitems** Will allow you to alter or filter the main navigation that is shown with the //get_navigation// template tag. The function that you pass //$menu// to should then return your results back to the system.

^ Filter ID     ^ Description                                           ^ arg type      ^ Support ^
|content        |filters page content data                              | string        |         |
|menuitems      |filters the menu html returned in ''get_navigation()'' | string        |         |
|**pagecache**  |filters the page cache xml object before saving        | simplexmlobj  | 3.3+    |
|**sitemap**    |filters the ''$sitemap'' xmlobj before saving          | simplexmlobj  | 3.3+    |
|**indexid**    |filters global page ''$id''                            | string        | 3.3+    |
|**data_index** |filters global page ''$data_index'' obj                | simplexmlobj  | 3.3+    |
|**editorlinks**|filters editor links ''get_link_menu_array''           | array| 3.3+    |
===== Core Hooks =====

<code>add_action( 'hook_name', 'function_to_call', array( arguments ) );</code>

The last argument is only necessary if function_to_call accepts parameters.

hook_name can be any of these and determines where the function will be called.

<del>DEPRECATED</del>\\
**NEW**\\

=== Front-End Hooks ===

^ Hook ID ^ Description ^ Support ^
| theme-header                   | Fired in ''<head>'' section of theme. Requires ''get_header()'' in template              |           | 
| theme-footer                   | Fired in the footer of the theme. Requires ''get_footer()'' in template          |           | 
| common                         | Called immediately after the plugin functions are included in ''common.php''     | 3.1+      | 
| content-top                    | Fired right above content area of theme                                          |           | 
| content-bottom                 | Fired right below content area of theme                                          |           | 
| index-pretemplate              | Called before your template files are rendered                                   |           | 
| index-posttemplate             | Called after your template files are rendered                                    |           | 
| error-404                      | Called if the page does not exist before rendering the error page                |           | 
| **index-post-dataindex**       | Called after the page globals are assigned from ''$data_index''                  |  3.3+         | 


=== Back-End Hooks ===
^ Hook ID ^ Description ^ Support ^
| admin-pre-header               | Called before the ''header.php'' template file is loaded                         | 3.1+      | 
| archive-backup                 | Fired when an archive backup has been created                                    |           | 
| <del>caching-save</del>        | Fired before ''data/other/pages.xml'' file is saved for caching                  | 3.1-3.3   | 
| changedata-aftersave           | Called after a page is saved                                                     | 3.1+      | 
| changedata-updateslug          | Called when slug changed on an existing page                                     |           | 
| changedata-save                | Called just before a page is saved                                               |           | 
| common                         | Called immediately after the plugin functions are included in ''common.php''     | 3.1+      | 
| component-extras               | Fired when creating component sections, allows additional form elements          |           | 
| edit-extras                    | Fired within the Page Options toggle-div within ''edit.php''                     |           | 
| file-extras                    | Fired at the end of the file list                                                |           | 
| file-uploaded                  | Fired after a file has been successfully uploaded                                |           | 
| footer                         | Called in the footer section of the rendered page                                |           | 
| download-file                  | Called when downloading files via ''download.php''                               |           | 
| header                         | Called in the head section of the rendered page                                  |           | 
| header-body                    | Called in the body before output of the page                                     |           | 
| healthcheck-extras             | Allows additional Health-check entries                                           |           | 
| html-editor-init               | Called after ckeditor js is output                                               |           | 
| index-login                    | Fired above the login form                                                       |           | 
| logfile_delete                 | fired when a logfile is deleted                                                  |           | 
| login-reqs                     | Fired on the login page footer                                                   |           | 
| logout                         | Fired when a user logs out                                                       |           | 
| page-delete                    | fired when a page is deleted                                                     |           | 
| **pagecache-aftersave**            | Fired after ''data/other/pages.xml'' pagecache file is successfully saved        | 3.3+      | 
| pages-main                     | Fired when the pages maincontent in rendered                                     |           | 
| plugin-hook                    | Fired before the Plugin page is rendered                                         |           | 
| resetpw-error                  | Fired when password reset and error                                              |           | 
| resetpw-success                | Fired when password reset and successful                                         |           | 
| <del>save-sitemap</del>        | Fired before the ''sitemap.xml'' file is saved                                   | -3.1      | 
| <del>settings-cpsettings</del> | Fired before the settings cp_settings file is created                            | 2.x-3.0   | 
| settings-user                  | Fired before the settings user file is created                                   |           | 
| settings-user-extras           | Fired on the settings page, before //Save Settings// in the user section         |           | 
| settings-website               | Fired before the settings website page is created                                |           | 
| settings-website-extras        | Fired on the settings page, before //Save Settings// in the website section      |           | 
| <del>sitemap-additem</del>     | Allow insertion of a new sitemap XML entry                                       | -3.1      | 
| **sitemap-aftersave**              | Called after the sitemap is successfully saved                                   | 3.3+      | 
| successful-login-end           | Fired after authentication success and before redirect                           |           | 
| successful-login-start         | Fired when before login authentication starts                                    |           | 
| support-extras                 | Allows additional support setting form entries                                   |           | 
| <del>support-save</del>        | Fired before ''cp_settings.xml'' file is created                                 | -3.0      | 
| theme-edit-extras              | Fired in the theme edit screen before the submit button                          |           | 
| theme-extras                   | Fired after the theme screenshot                                                 |           | 
| welcome-doc-link               | Allows additional documentation links on the Welcome page                        |           | 
| welcome-link                   | Allows additional links on the Welcome page                                      |           | 

The following actions allow the customization of the administration menu and are described on [[plugins:tabs_menus|Tabs and Menus]]:

  * **backups-sidebar, files-sidebar, pages-sidebar, plugins-sidebar, settings-sidebar, support-sidebar, theme-sidebar** Allows additional sidebar menu items 
  * **nav-tab** Allow insertion of a new tabbed entry in the navigation bar

=== Back-End GUI ===
^ Hook ID          ^ Description                   ^ Support ^
| backups-sidebar  | Sidebar item on Backups Page  |         |
| files-sidebar    | Sidebar item on Files Page    |         |
| pages-sidebar    | Sidebar item on Pages Page    |         |
| plugins-sidebar  | Sidebar item on Plugins Page  |         |
| settings-sidebar | Sidebar item on Settings Page |         |
| support-sidebar  | Sidebar item on Support Page  |         |
| theme-sidebar    | Sidebar item on Theme Page    |         |
| nav-tab          | Insert navigation bar tab     |         |

===== Creating and Using Plugin Hooks/Filters =====

Similar to core hooks and filters, plugins can create their own by using the functions ''exec_action'' and ''exec_filter''. 

<code>
exec_action( $hook_name );
</code>

<code>
exec_filter( $filter_name, $value );
</code>

If your plugin uses a GS hook to alter content before it is saved (e.g, the [[http://get-simple.info/extend/plugin/multi-user/133/|MultiUser plugin]] changes the output to the ''user.xml'' file and makes all changes from other plugins in this hook undone), it is especially important to add a custom hook, so that other plugin developers can make their plugins compatible with yours if they need to alter the data too. 

If you created a plugin hook called 'your-plugin-hook', as described in the paragraph above, other plugin developers could then:

  - (1) detect whether your plugin is active by using ''pluginIsActive('your-plugin-name')'' (GS 3.3.4+) or by checking for existence of your init function/a constant you defined, and
  - (2) use your hook with ''add_action('your-plugin-hook', 'their-function')''.

This is an important step to take in making multiple plugins from different authors compatible with one another.

When naming hooks in your plugins //be sure to use a unique name// to not step on core hook ids.
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