WordPress/wp-includes/default-filters.php

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<?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
foreach ( 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' ) as $filter ) {
add_filter( $filter, 'sanitize_text_field' );
add_filter( $filter, 'wp_filter_kses' );
add_filter( $filter, '_wp_specialchars', 30 );
}
// Strip, kses, special chars for string display
foreach ( array( 'term_name', 'comment_author_name', 'link_name', 'link_target', 'link_rel', 'user_display_name', 'user_first_name', 'user_last_name', 'user_nickname' ) as $filter ) {
add_filter( $filter, 'sanitize_text_field' );
add_filter( $filter, 'wp_kses_data' );
add_filter( $filter, '_wp_specialchars', 30 );
}
// Kses only for textarea saves
foreach ( array( 'pre_term_description', 'pre_link_description', 'pre_link_notes', 'pre_user_description' ) as $filter ) {
add_filter( $filter, 'wp_filter_kses' );
}
// Kses only for textarea saves displays
foreach ( array( 'term_description', 'link_description', 'link_notes', 'user_description' ) as $filter ) {
add_filter( $filter, 'wp_kses_data' );
}
// Email saves
foreach ( array( 'pre_comment_author_email', 'pre_user_email' ) as $filter ) {
add_filter( $filter, 'trim' );
add_filter( $filter, 'sanitize_email' );
add_filter( $filter, 'wp_filter_kses' );
}
// Email display
foreach ( array( 'comment_author_email', 'user_email' ) as $filter ) {
add_filter( $filter, 'sanitize_email' );
add_filter( $filter, 'wp_kses_data' );
}
// Save URL
foreach ( array( 'pre_comment_author_url', 'pre_user_url', 'pre_link_url', 'pre_link_image',
'pre_link_rss' ) as $filter ) {
add_filter( $filter, 'wp_strip_all_tags' );
add_filter( $filter, 'esc_url_raw' );
add_filter( $filter, 'wp_filter_kses' );
}
// Display URL
foreach ( array( 'user_url', 'link_url', 'link_image', 'link_rss', 'comment_url' ) as $filter ) {
add_filter( $filter, 'wp_strip_all_tags' );
add_filter( $filter, 'esc_url' );
add_filter( $filter, 'wp_kses_data' );
}
// Slugs
foreach ( array( 'pre_term_slug' ) as $filter ) {
add_filter( $filter, 'sanitize_title' );
}
// Keys
foreach ( array( 'pre_post_type' ) as $filter ) {
add_filter( $filter, 'sanitize_user' );
}
// Places to balance tags on input
foreach ( array( 'content_save_pre', 'excerpt_save_pre', 'comment_save_pre', 'pre_comment_content' ) as $filter ) {
add_filter( $filter, 'balanceTags', 50 );
}
// Format strings for display.
foreach ( array( 'comment_author', 'term_name', 'link_name', 'link_description', 'link_notes', 'bloginfo', 'wp_title', 'widget_title' ) as $filter ) {
add_filter( $filter, 'wptexturize' );
add_filter( $filter, 'convert_chars' );
add_filter( $filter, 'esc_html' );
}
// Format titles
foreach ( array( 'single_post_title', 'single_cat_title', 'single_tag_title', 'single_month_title' ) as $filter ) {
add_filter( $filter, 'wptexturize' );
add_filter( $filter, 'strip_tags' );
}
// Format text area for display.
foreach ( array( 'term_description' ) as $filter ) {
add_filter( $filter, 'wptexturize' );
add_filter( $filter, 'convert_chars' );
add_filter( $filter, 'wpautop' );
add_filter( $filter, 'shortcode_unautop');
}
// Format for RSS
foreach ( array( 'term_name_rss' ) 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', 'shortcode_unautop' );
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( 'the_excerpt', 'shortcode_unautop');
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', 2 );
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_head', 'rel_canonical' );
add_action( 'wp_footer', 'wp_print_footer_scripts' );
add_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 );
add_action( 'template_redirect', 'wp_shortlink_header', 11, 0 );
// Feed Generator Tags
foreach ( array( 'rss2_head', 'commentsrss2_head', 'rss_head', 'rdf_header', 'atom_head', 'comments_atom_head', 'opml_head', 'app_head' ) as $action ) {
add_action( $action, 'the_generator' );
}
// WP Cron
if ( !defined( 'DOING_CRON' ) )
add_action( 'sanitize_comment_cookies', 'wp_cron' );
// 2 Actions 2 Furious
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_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( 'plugins_loaded', 'wp_maybe_load_embeds', 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' );
add_action( 'wp_scheduled_delete', 'wp_scheduled_delete' );
// Post Thumbnail CSS class filtering
add_action( 'begin_fetch_post_thumbnail_html', '_wp_post_thumbnail_class_filter_add' );
add_action( 'end_fetch_post_thumbnail_html', '_wp_post_thumbnail_class_filter_remove' );
// 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' );
// Timezone
add_filter( 'pre_option_gmt_offset','wp_timezone_override_offset' );
// Admin Color Schemes
add_action( 'admin_init', 'register_admin_color_schemes', 1);
add_action( 'admin_color_scheme_picker', 'admin_color_scheme_picker' );