source: trunk/www.guidonia.net/wp/wp-includes/default-filters.php@ 44

<?php
/**
 * Sets up the default filters and actions for most
 * of the WordPress hooks.
 *
 * If you need to remove a default hook, this file will
 * give you the priority for which to use to remove the
 * hook.
 *
 * Not all of the default hooks are found in default-filters.php
 *
 * @package WordPress
 */

// Strip, trim, kses, special chars for string saves
$filters = array('pre_term_name', 'pre_comment_author_name', 'pre_link_name', 'pre_link_target',
        'pre_link_rel', 'pre_user_display_name', 'pre_user_first_name', 'pre_user_last_name',
        'pre_user_nickname');
foreach ( $filters as $filter ) {
        add_filter($filter, 'strip_tags');
        add_filter($filter, 'trim');
        add_filter($filter, 'wp_filter_kses');
        add_filter($filter, '_wp_specialchars', 30);
}

// Kses only for textarea saves
$filters = array('pre_term_description', 'pre_link_description', 'pre_link_notes', 'pre_user_description');
foreach ( $filters as $filter ) {
        add_filter($filter, 'wp_filter_kses');
}

// Email
$filters = array('pre_comment_author_email', 'pre_user_email');
foreach ( $filters as $filter ) {
        add_filter($filter, 'trim');
        add_filter($filter, 'sanitize_email');
        add_filter($filter, 'wp_filter_kses');
}

// Save URL
$filters = array('pre_comment_author_url', 'pre_user_url', 'pre_link_url', 'pre_link_image',
        'pre_link_rss');
foreach ( $filters as $filter ) {
        add_filter($filter, 'strip_tags');
        add_filter($filter, 'trim');
        add_filter($filter, 'esc_url_raw');
        add_filter($filter, 'wp_filter_kses');
}

// Display URL
$filters = array('user_url', 'link_url', 'link_image', 'link_rss', 'comment_url');
foreach ( $filters as $filter ) {
        add_filter($filter, 'strip_tags');
        add_filter($filter, 'trim');
        add_filter($filter, 'esc_url');
        add_filter($filter, 'wp_filter_kses');
}

// Slugs
$filters = array('pre_term_slug');
foreach ( $filters as $filter ) {
        add_filter($filter, 'sanitize_title');
}

// Keys
$filters = array('pre_post_type');
foreach ( $filters as $filter ) {
        add_filter($filter, 'sanitize_user');
}

// Places to balance tags on input
$filters = array('content_save_pre', 'excerpt_save_pre', 'comment_save_pre', 'pre_comment_content');
foreach ( $filters as $filter ) {
        add_filter( $filter, 'balanceTags', 50);
}

// Format strings for display.
$filters = array('comment_author', 'term_name', 'link_name', 'link_description',
        'link_notes', 'bloginfo', 'wp_title', 'widget_title');
foreach ( $filters as $filter ) {
        add_filter($filter, 'wptexturize');
        add_filter($filter, 'convert_chars');
        add_filter($filter, 'esc_html');
}

// Format text area for display.
$filters = array('term_description');
foreach ( $filters as $filter ) {
        add_filter($filter, 'wptexturize');
        add_filter($filter, 'convert_chars');
        add_filter($filter, 'wpautop');
}

// Format for RSS
$filters = array('term_name_rss');
foreach ( $filters as $filter ) {
        add_filter($filter, 'convert_chars');
}

// Display filters
add_filter('the_title', 'wptexturize');
add_filter('the_title', 'convert_chars');
add_filter('the_title', 'trim');

add_filter('the_content', 'wptexturize');
add_filter('the_content', 'convert_smilies');
add_filter('the_content', 'convert_chars');
add_filter('the_content', 'wpautop');
add_filter('the_content', 'prepend_attachment');

add_filter('the_excerpt', 'wptexturize');
add_filter('the_excerpt', 'convert_smilies');
add_filter('the_excerpt', 'convert_chars');
add_filter('the_excerpt', 'wpautop');
add_filter('get_the_excerpt', 'wp_trim_excerpt');

add_filter('comment_text', 'wptexturize');
add_filter('comment_text', 'convert_chars');
add_filter('comment_text', 'make_clickable', 9);
add_filter('comment_text', 'force_balance_tags', 25);
add_filter('comment_text', 'convert_smilies', 20);
add_filter('comment_text', 'wpautop', 30);

add_filter('comment_excerpt', 'convert_chars');

add_filter('list_cats', 'wptexturize');
add_filter('single_post_title', 'wptexturize');

add_filter('wp_sprintf', 'wp_sprintf_l', 10, 2);

// RSS filters
add_filter('the_title_rss', 'strip_tags');
add_filter('the_title_rss', 'ent2ncr', 8);
add_filter('the_title_rss', 'esc_html');
add_filter('the_content_rss', 'ent2ncr', 8);
add_filter('the_excerpt_rss', 'convert_chars');
add_filter('the_excerpt_rss', 'ent2ncr', 8);
add_filter('comment_author_rss', 'ent2ncr', 8);
add_filter('comment_text_rss', 'ent2ncr', 8);
add_filter('comment_text_rss', 'esc_html');
add_filter('bloginfo_rss', 'ent2ncr', 8);
add_filter('the_author', 'ent2ncr', 8);

// Misc filters
add_filter('option_ping_sites', 'privacy_ping_filter');
add_filter('option_blog_charset', '_wp_specialchars'); // IMPORTANT: This must not be wp_specialchars() or esc_html() or it'll cause an infinite loop
add_filter('option_home', '_config_wp_home');
add_filter('option_siteurl', '_config_wp_siteurl');
add_filter('tiny_mce_before_init', '_mce_set_direction');
add_filter('pre_kses', 'wp_pre_kses_less_than');
add_filter('sanitize_title', 'sanitize_title_with_dashes');
add_action('check_comment_flood', 'check_comment_flood_db', 10, 3);
add_filter('comment_flood_filter', 'wp_throttle_comment_flood', 10, 3);
add_filter('pre_comment_content', 'wp_rel_nofollow', 15);
add_filter('comment_email', 'antispambot');
add_filter('option_tag_base', '_wp_filter_taxonomy_base');
add_filter('option_category_base', '_wp_filter_taxonomy_base');
add_filter( 'the_posts', '_close_comments_for_old_posts' );
add_filter( 'comments_open', '_close_comments_for_old_post', 10, 2 );
add_filter( 'pings_open', '_close_comments_for_old_post', 10, 2 );
add_filter( 'editable_slug', 'urldecode' );

// Atom SSL support
add_filter('atom_service_url','atom_service_url_filter');

// Actions
add_action('wp_head', 'wp_enqueue_scripts', 1);
add_action('wp_head', 'feed_links_extra', 3);
add_action('wp_head', 'rsd_link');
add_action('wp_head', 'wlwmanifest_link');
add_action('wp_head', 'index_rel_link');
add_action('wp_head', 'parent_post_rel_link', 10, 0);
add_action('wp_head', 'start_post_rel_link', 10, 0);
add_action('wp_head', 'adjacent_posts_rel_link', 10, 0);
add_action('wp_head', 'locale_stylesheet');
add_action('publish_future_post', 'check_and_publish_future_post', 10, 1);
add_action('wp_head', 'noindex', 1);
add_action('wp_head', 'wp_print_styles', 8);
add_action('wp_head', 'wp_print_head_scripts', 9);
add_action('wp_head', 'wp_generator');
add_action('wp_footer', 'wp_print_footer_scripts');
if(!defined('DOING_CRON'))
        add_action('sanitize_comment_cookies', 'wp_cron');
add_action('do_feed_rdf', 'do_feed_rdf', 10, 1);
add_action('do_feed_rss', 'do_feed_rss', 10, 1);
add_action('do_feed_rss2', 'do_feed_rss2', 10, 1);
add_action('do_feed_atom', 'do_feed_atom', 10, 1);
add_action('do_pings', 'do_all_pings', 10, 1);
add_action('do_generic_ping', 'generic_ping', 10, 1);
add_action('do_robots', 'do_robots');
add_action('sanitize_comment_cookies', 'sanitize_comment_cookies');
add_action('admin_print_scripts', 'print_head_scripts', 20);
add_action('admin_print_footer_scripts', 'print_footer_scripts', 20);
add_action('admin_print_styles', 'print_admin_styles', 20);
add_action('init', 'smilies_init', 5);
add_action( 'plugins_loaded', 'wp_maybe_load_widgets', 0 );
add_action( 'shutdown', 'wp_ob_end_flush_all', 1);
add_action( 'pre_post_update', 'wp_save_post_revision' );
add_action('publish_post', '_publish_post_hook', 5, 1);
add_action('future_post', '_future_post_hook', 5, 2);
add_action('future_page', '_future_post_hook', 5, 2);
add_action('save_post', '_save_post_hook', 5, 2);
add_action('transition_post_status', '_transition_post_status', 5, 3);
add_action('comment_form', 'wp_comment_form_unfiltered_html_nonce');
// Redirect Old Slugs
add_action('template_redirect', 'wp_old_slug_redirect');
add_action('edit_post', 'wp_check_for_changed_slugs');
add_action('edit_form_advanced', 'wp_remember_old_slug');
add_action('init', '_show_post_preview');

add_filter('pre_option_gmt_offset','wp_timezone_override_offset');

?>