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In my attempt to alter navigations current-menu-item class, I found a possible solution https://stackoverflow.com/a/7941864/520265 , 

add_filter('nav_menu_css_class', 'my_css_attributes_filter', 100, 1);

He makes use of a filter who is called with a tag 'nav_menu_css_class' , But it got me wondering, where can you find information about what filters are available to use?

http://codex.wordpress.org/Function_Reference/wp_nav_menu does not mention anything about filters...

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3 Answers 3

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There are multiple was to find filters:

  1. Use an IDE (see Eclipse example), set WordPress as a separate project and search in this project for apply_filters or do_action.

  2. Get a program to search in all files of a directory (grep, Notepad++) and do the same search with that.

  3. Read the source code. If you start with wp_nav_menu() and follow the functions called in its definition you will find the filters and actions you need.

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  • Great, source code it is , thanks! (will accept in couple of minutes)
    – David
    Commented Dec 15, 2012 at 19:52
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    Try grin, it's the best way to read source code IMHO :) (if on Linux, just install it from your package manager)
    – webaware
    Commented Dec 16, 2012 at 2:50
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Some of the available filters are listed in the WordPress Codex

Adam Brown hosts a much more complete list of action and filter hooks.

You can also search through the source, as @toscho mentioned.

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Also you can use the plugin Debug Objects; the plugin list action and filter hooks on the current page or all hooks.

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