WordPress 2.x Filter List for Plugin and Theme Developers

mce_buttons defaults to array(’bold’, ‘italic’, ’strikethrough’, ’separator’, ‘bullist’, ‘numlist’, ‘outdent’, ‘indent’, ’separator’, ‘justifyleft’, ‘justifycenter’, ‘justifyright’ ,’separator’, ‘link’, ‘unlink’, ‘image’, ‘wordpress’, ’separator’, ‘undo’, ‘redo’, ‘code’, ‘wphelp’)

mce_buttons_2 and mce_buttons_3 default to empty arrays (array()).

An example function to add your own button after a separator on the right of the first row:

add_filter('mce_buttons', 'extended_editor_mce_buttons', 0);

function extended_editor_mce_buttons($buttons) {
    array_push($buttons, 'plugin_name');
    return $buttons;
}

     array('wordpress', 'autosave', 'wphelp')

An example function to add your own plugin:

add_filter('mce_plugins', 'extended_editor_mce_plugins', 0);

function extended_editor_mce_plugins($plugins) {
    array_push($plugins, 'plugin_name');
    return $plugins;
}

An example function to add your own valid elements (without overriding the defaults):

add_filter('mce_valid_elements', 'extended_editor_mce_valid_elements', 0);

function extended_editor_mce_valid_elements($valid_elements) {
    $valid_elements .= 'element1,element2';
    return $valid_elements;
}