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--- plugins:hooks_filters [2015/03/02 17:52]
Carlos [Core Filters] fix pagecache filter description
+++ plugins:hooks_filters [2017/01/19 16:07]
lokothodida [Creating and Using Plugin Hooks]
@@ Line 101: / Line 101: @@
 | theme-sidebar    | Sidebar item on Theme Page    |         |
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+===== 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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