wp-includes/default-filters.php

   1 <?php
   2 /**
   3  * Sets up the default filters and actions for most
   4  * of the WordPress hooks.
   5  *
   6  * If you need to remove a default hook, this file will
   7  * give you the priority for which to use to remove the
   8  * hook.
   9  *
  10  * Not all of the default hooks are found in default-filters.php
  11  *
  12  * @package WordPress
  13  */
  14
  15 // Strip, trim, kses, special chars for string saves
  16 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 ) {
  17         add_filter( $filter, 'sanitize_text_field'  );
  18         add_filter( $filter, 'wp_filter_kses'       );
  19         add_filter( $filter, '_wp_specialchars', 30 );
  20 }
  21
  22 // Strip, kses, special chars for string display
  23 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 ) {
  24         if ( is_admin() ) {
  25                 // These are expensive. Run only on admin pages for defense in depth.
  26                 add_filter( $filter, 'sanitize_text_field'  );
  27                 add_filter( $filter, 'wp_kses_data'       );
  28         }
  29         add_filter( $filter, '_wp_specialchars', 30 );
  30 }
  31
  32 // Kses only for textarea saves
  33 foreach ( array( 'pre_term_description', 'pre_link_description', 'pre_link_notes', 'pre_user_description' ) as $filter ) {
  34         add_filter( $filter, 'wp_filter_kses' );
  35 }
  36
  37 // Kses only for textarea admin displays
  38 if ( is_admin() ) {
  39         foreach ( array( 'term_description', 'link_description', 'link_notes', 'user_description' ) as $filter ) {
  40                 add_filter( $filter, 'wp_kses_data' );
  41         }
  42         add_filter( 'comment_text', 'wp_kses_post' );
  43 }
  44
  45 // Email saves
  46 foreach ( array( 'pre_comment_author_email', 'pre_user_email' ) as $filter ) {
  47         add_filter( $filter, 'trim'           );
  48         add_filter( $filter, 'sanitize_email' );
  49         add_filter( $filter, 'wp_filter_kses' );
  50 }
  51
  52 // Email admin display
  53 foreach ( array( 'comment_author_email', 'user_email' ) as $filter ) {
  54         add_filter( $filter, 'sanitize_email' );
  55         if ( is_admin() )
  56                 add_filter( $filter, 'wp_kses_data' );
  57 }
  58
  59 // Save URL
  60 foreach ( array( 'pre_comment_author_url', 'pre_user_url', 'pre_link_url', 'pre_link_image',
  61         'pre_link_rss', 'pre_post_guid' ) as $filter ) {
  62         add_filter( $filter, 'wp_strip_all_tags' );
  63         add_filter( $filter, 'esc_url_raw'       );
  64         add_filter( $filter, 'wp_filter_kses'    );
  65 }
  66
  67 // Display URL
  68 foreach ( array( 'user_url', 'link_url', 'link_image', 'link_rss', 'comment_url', 'post_guid' ) as $filter ) {
  69         if ( is_admin() )
  70                 add_filter( $filter, 'wp_strip_all_tags' );
  71         add_filter( $filter, 'esc_url'           );
  72         if ( is_admin() )
  73                 add_filter( $filter, 'wp_kses_data'    );
  74 }
  75
  76 // Slugs
  77 add_filter( 'pre_term_slug', 'sanitize_title' );
  78
  79 // Keys
  80 foreach ( array( 'pre_post_type', 'pre_post_status', 'pre_post_comment_status', 'pre_post_ping_status' ) as $filter ) {
  81         add_filter( $filter, 'sanitize_key' );
  82 }
  83
  84 // Mime types
  85 add_filter( 'pre_post_mime_type', 'sanitize_mime_type' );
  86 add_filter( 'post_mime_type', 'sanitize_mime_type' );
  87
  88 // Places to balance tags on input
  89 foreach ( array( 'content_save_pre', 'excerpt_save_pre', 'comment_save_pre', 'pre_comment_content' ) as $filter ) {
  90         add_filter( $filter, 'convert_invalid_entities' );
  91         add_filter( $filter, 'balanceTags', 50 );
  92 }
  93
  94 // Format strings for display.
  95 foreach ( array( 'comment_author', 'term_name', 'link_name', 'link_description', 'link_notes', 'bloginfo', 'wp_title', 'widget_title' ) as $filter ) {
  96         add_filter( $filter, 'wptexturize'   );
  97         add_filter( $filter, 'convert_chars' );
  98         add_filter( $filter, 'esc_html'      );
  99 }
 100
 101 // Format WordPress
 102 foreach ( array( 'the_content', 'the_title', 'wp_title' ) as $filter )
 103         add_filter( $filter, 'capital_P_dangit', 11 );
 104 add_filter( 'comment_text', 'capital_P_dangit', 31 );
 105
 106 // Format titles
 107 foreach ( array( 'single_post_title', 'single_cat_title', 'single_tag_title', 'single_month_title', 'nav_menu_attr_title', 'nav_menu_description' ) as $filter ) {
 108         add_filter( $filter, 'wptexturize' );
 109         add_filter( $filter, 'strip_tags'  );
 110 }
 111
 112 // Format text area for display.
 113 foreach ( array( 'term_description' ) as $filter ) {
 114         add_filter( $filter, 'wptexturize'      );
 115         add_filter( $filter, 'convert_chars'    );
 116         add_filter( $filter, 'wpautop'          );
 117         add_filter( $filter, 'shortcode_unautop');
 118 }
 119
 120 // Format for RSS
 121 add_filter( 'term_name_rss', 'convert_chars' );
 122
 123 // Pre save hierarchy
 124 add_filter( 'wp_insert_post_parent', 'wp_check_post_hierarchy_for_loops', 10, 2 );
 125 add_filter( 'wp_update_term_parent', 'wp_check_term_hierarchy_for_loops', 10, 3 );
 126
 127 // Display filters
 128 add_filter( 'the_title', 'wptexturize'   );
 129 add_filter( 'the_title', 'convert_chars' );
 130 add_filter( 'the_title', 'trim'          );
 131
 132 add_filter( 'the_content', 'wptexturize'                       );
 133 add_filter( 'the_content', 'convert_smilies'                   );
 134 add_filter( 'the_content', 'wpautop'                           );
 135 add_filter( 'the_content', 'shortcode_unautop'                 );
 136 add_filter( 'the_content', 'prepend_attachment'                );
 137 add_filter( 'the_content', 'wp_make_content_images_responsive' );
 138
 139 add_filter( 'the_excerpt',     'wptexturize'      );
 140 add_filter( 'the_excerpt',     'convert_smilies'  );
 141 add_filter( 'the_excerpt',     'convert_chars'    );
 142 add_filter( 'the_excerpt',     'wpautop'          );
 143 add_filter( 'the_excerpt',     'shortcode_unautop');
 144 add_filter( 'get_the_excerpt', 'wp_trim_excerpt'  );
 145
 146 add_filter( 'comment_text', 'wptexturize'            );
 147 add_filter( 'comment_text', 'convert_chars'          );
 148 add_filter( 'comment_text', 'make_clickable',      9 );
 149 add_filter( 'comment_text', 'force_balance_tags', 25 );
 150 add_filter( 'comment_text', 'convert_smilies',    20 );
 151 add_filter( 'comment_text', 'wpautop',            30 );
 152
 153 add_filter( 'comment_excerpt', 'convert_chars' );
 154
 155 add_filter( 'list_cats',         'wptexturize' );
 156
 157 add_filter( 'wp_sprintf', 'wp_sprintf_l', 10, 2 );
 158
 159 add_filter( 'widget_text', 'balanceTags' );
 160
 161 add_filter( 'date_i18n', 'wp_maybe_decline_date' );
 162
 163 // RSS filters
 164 add_filter( 'the_title_rss',      'strip_tags'                    );
 165 add_filter( 'the_title_rss',      'ent2ncr',                    8 );
 166 add_filter( 'the_title_rss',      'esc_html'                      );
 167 add_filter( 'the_content_rss',    'ent2ncr',                    8 );
 168 add_filter( 'the_content_feed',   'wp_staticize_emoji'            );
 169 add_filter( 'the_content_feed',   '_oembed_filter_feed_content'   );
 170 add_filter( 'the_excerpt_rss',    'convert_chars'                 );
 171 add_filter( 'the_excerpt_rss',    'ent2ncr',                    8 );
 172 add_filter( 'comment_author_rss', 'ent2ncr',                    8 );
 173 add_filter( 'comment_text_rss',   'ent2ncr',                    8 );
 174 add_filter( 'comment_text_rss',   'esc_html'                      );
 175 add_filter( 'comment_text_rss',   'wp_staticize_emoji'            );
 176 add_filter( 'bloginfo_rss',       'ent2ncr',                    8 );
 177 add_filter( 'the_author',         'ent2ncr',                    8 );
 178 add_filter( 'the_guid',           'esc_url'                       );
 179
 180 // Email filters
 181 add_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
 182
 183 // Misc filters
 184 add_filter( 'option_ping_sites',        'privacy_ping_filter'                 );
 185 add_filter( 'option_blog_charset',      '_wp_specialchars'                    ); // IMPORTANT: This must not be wp_specialchars() or esc_html() or it'll cause an infinite loop
 186 add_filter( 'option_blog_charset',      '_canonical_charset'                  );
 187 add_filter( 'option_home',              '_config_wp_home'                     );
 188 add_filter( 'option_siteurl',           '_config_wp_siteurl'                  );
 189 add_filter( 'tiny_mce_before_init',     '_mce_set_direction'                  );
 190 add_filter( 'teeny_mce_before_init',    '_mce_set_direction'                  );
 191 add_filter( 'pre_kses',                 'wp_pre_kses_less_than'               );
 192 add_filter( 'sanitize_title',           'sanitize_title_with_dashes',   10, 3 );
 193 add_action( 'check_comment_flood',      'check_comment_flood_db',       10, 3 );
 194 add_filter( 'comment_flood_filter',     'wp_throttle_comment_flood',    10, 3 );
 195 add_filter( 'pre_comment_content',      'wp_rel_nofollow',              15    );
 196 add_filter( 'comment_email',            'antispambot'                         );
 197 add_filter( 'option_tag_base',          '_wp_filter_taxonomy_base'            );
 198 add_filter( 'option_category_base',     '_wp_filter_taxonomy_base'            );
 199 add_filter( 'the_posts',                '_close_comments_for_old_posts', 10, 2);
 200 add_filter( 'comments_open',            '_close_comments_for_old_post', 10, 2 );
 201 add_filter( 'pings_open',               '_close_comments_for_old_post', 10, 2 );
 202 add_filter( 'editable_slug',            'urldecode'                           );
 203 add_filter( 'editable_slug',            'esc_textarea'                        );
 204 add_filter( 'nav_menu_meta_box_object', '_wp_nav_menu_meta_box_object'        );
 205 add_filter( 'pingback_ping_source_uri', 'pingback_ping_source_uri'            );
 206 add_filter( 'xmlrpc_pingback_error',    'xmlrpc_pingback_error'               );
 207 add_filter( 'title_save_pre',           'trim'                                );
 208
 209 add_filter( 'http_request_host_is_external', 'allowed_http_request_hosts', 10, 2 );
 210
 211 // REST API filters.
 212 add_action( 'xmlrpc_rsd_apis',            'rest_output_rsd' );
 213 add_action( 'wp_head',                    'rest_output_link_wp_head', 10, 0 );
 214 add_action( 'template_redirect',          'rest_output_link_header', 11, 0 );
 215 add_action( 'auth_cookie_malformed',      'rest_cookie_collect_status' );
 216 add_action( 'auth_cookie_expired',        'rest_cookie_collect_status' );
 217 add_action( 'auth_cookie_bad_username',   'rest_cookie_collect_status' );
 218 add_action( 'auth_cookie_bad_hash',       'rest_cookie_collect_status' );
 219 add_action( 'auth_cookie_valid',          'rest_cookie_collect_status' );
 220 add_filter( 'rest_authentication_errors', 'rest_cookie_check_errors', 100 );
 221
 222 // Actions
 223 add_action( 'wp_head',             '_wp_render_title_tag',            1     );
 224 add_action( 'wp_head',             'wp_enqueue_scripts',              1     );
 225 add_action( 'wp_head',             'feed_links',                      2     );
 226 add_action( 'wp_head',             'feed_links_extra',                3     );
 227 add_action( 'wp_head',             'rsd_link'                               );
 228 add_action( 'wp_head',             'wlwmanifest_link'                       );
 229 add_action( 'wp_head',             'adjacent_posts_rel_link_wp_head', 10, 0 );
 230 add_action( 'wp_head',             'locale_stylesheet'                      );
 231 add_action( 'publish_future_post', 'check_and_publish_future_post',   10, 1 );
 232 add_action( 'wp_head',             'noindex',                          1    );
 233 add_action( 'wp_head',             'print_emoji_detection_script',     7    );
 234 add_action( 'wp_head',             'wp_print_styles',                  8    );
 235 add_action( 'wp_head',             'wp_print_head_scripts',            9    );
 236 add_action( 'wp_head',             'wp_generator'                           );
 237 add_action( 'wp_head',             'rel_canonical'                          );
 238 add_action( 'wp_head',             'wp_shortlink_wp_head',            10, 0 );
 239 add_action( 'wp_head',             'wp_site_icon',                    99    );
 240 add_action( 'wp_footer',           'wp_print_footer_scripts',         20    );
 241 add_action( 'template_redirect',   'wp_shortlink_header',             11, 0 );
 242 add_action( 'wp_print_footer_scripts', '_wp_footer_scripts'                 );
 243 add_action( 'init',                'check_theme_switched',            99    );
 244 add_action( 'after_switch_theme',  '_wp_sidebars_changed'                   );
 245 add_action( 'wp_print_styles',     'print_emoji_styles'                     );
 246
 247 if ( isset( $_GET['replytocom'] ) )
 248     add_action( 'wp_head', 'wp_no_robots' );
 249
 250 // Login actions
 251 add_action( 'login_head',          'wp_print_head_scripts',         9     );
 252 add_action( 'login_head',          'wp_site_icon',                  99    );
 253 add_action( 'login_footer',        'wp_print_footer_scripts',       20    );
 254 add_action( 'login_init',          'send_frame_options_header',     10, 0 );
 255
 256 // Feed Generator Tags
 257 foreach ( array( 'rss2_head', 'commentsrss2_head', 'rss_head', 'rdf_header', 'atom_head', 'comments_atom_head', 'opml_head', 'app_head' ) as $action ) {
 258         add_action( $action, 'the_generator' );
 259 }
 260
 261 // Feed Site Icon
 262 add_action( 'atom_head', 'atom_site_icon' );
 263 add_action( 'rss2_head', 'rss2_site_icon' );
 264
 265
 266 // WP Cron
 267 if ( !defined( 'DOING_CRON' ) )
 268         add_action( 'init', 'wp_cron' );
 269
 270 // 2 Actions 2 Furious
 271 add_action( 'do_feed_rdf',                'do_feed_rdf',                             10, 1 );
 272 add_action( 'do_feed_rss',                'do_feed_rss',                             10, 1 );
 273 add_action( 'do_feed_rss2',               'do_feed_rss2',                            10, 1 );
 274 add_action( 'do_feed_atom',               'do_feed_atom',                            10, 1 );
 275 add_action( 'do_pings',                   'do_all_pings',                            10, 1 );
 276 add_action( 'do_robots',                  'do_robots'                                      );
 277 add_action( 'set_comment_cookies',        'wp_set_comment_cookies',                  10, 2 );
 278 add_action( 'sanitize_comment_cookies',   'sanitize_comment_cookies'                       );
 279 add_action( 'admin_print_scripts',        'print_emoji_detection_script'                   );
 280 add_action( 'admin_print_scripts',        'print_head_scripts',                      20    );
 281 add_action( 'admin_print_footer_scripts', '_wp_footer_scripts'                             );
 282 add_action( 'admin_print_styles',         'print_emoji_styles'                             );
 283 add_action( 'admin_print_styles',         'print_admin_styles',                      20    );
 284 add_action( 'init',                       'smilies_init',                             5    );
 285 add_action( 'plugins_loaded',             'wp_maybe_load_widgets',                    0    );
 286 add_action( 'plugins_loaded',             'wp_maybe_load_embeds',                     0    );
 287 add_action( 'shutdown',                   'wp_ob_end_flush_all',                      1    );
 288 // Create a revision whenever a post is updated.
 289 add_action( 'post_updated',               'wp_save_post_revision',                   10, 1 );
 290 add_action( 'publish_post',               '_publish_post_hook',                       5, 1 );
 291 add_action( 'transition_post_status',     '_transition_post_status',                  5, 3 );
 292 add_action( 'transition_post_status',     '_update_term_count_on_transition_post_status', 10, 3 );
 293 add_action( 'comment_form',               'wp_comment_form_unfiltered_html_nonce'          );
 294 add_action( 'wp_scheduled_delete',        'wp_scheduled_delete'                            );
 295 add_action( 'wp_scheduled_auto_draft_delete', 'wp_delete_auto_drafts'                      );
 296 add_action( 'admin_init',                 'send_frame_options_header',               10, 0 );
 297 add_action( 'importer_scheduled_cleanup', 'wp_delete_attachment'                           );
 298 add_action( 'upgrader_scheduled_cleanup', 'wp_delete_attachment'                           );
 299 add_action( 'welcome_panel',              'wp_welcome_panel'                               );
 300
 301 // Navigation menu actions
 302 add_action( 'delete_post',                '_wp_delete_post_menu_item'         );
 303 add_action( 'delete_term',                '_wp_delete_tax_menu_item',   10, 3 );
 304 add_action( 'transition_post_status',     '_wp_auto_add_pages_to_menu', 10, 3 );
 305
 306 // Post Thumbnail CSS class filtering
 307 add_action( 'begin_fetch_post_thumbnail_html', '_wp_post_thumbnail_class_filter_add'    );
 308 add_action( 'end_fetch_post_thumbnail_html',   '_wp_post_thumbnail_class_filter_remove' );
 309
 310 // Redirect Old Slugs
 311 add_action( 'template_redirect',  'wp_old_slug_redirect'              );
 312 add_action( 'post_updated',       'wp_check_for_changed_slugs', 12, 3 );
 313 add_action( 'attachment_updated', 'wp_check_for_changed_slugs', 12, 3 );
 314
 315 // Nonce check for Post Previews
 316 add_action( 'init', '_show_post_preview' );
 317
 318 // Output JS to reset window.name for previews
 319 add_action( 'wp_head', 'wp_post_preview_js', 1 );
 320
 321 // Timezone
 322 add_filter( 'pre_option_gmt_offset','wp_timezone_override_offset' );
 323
 324 // Admin Color Schemes
 325 add_action( 'admin_init', 'register_admin_color_schemes', 1);
 326 add_action( 'admin_color_scheme_picker', 'admin_color_scheme_picker' );
 327
 328 // If the upgrade hasn't run yet, assume link manager is used.
 329 add_filter( 'default_option_link_manager_enabled', '__return_true' );
 330
 331 // This option no longer exists; tell plugins we always support auto-embedding.
 332 add_filter( 'default_option_embed_autourls', '__return_true' );
 333
 334 // Default settings for heartbeat
 335 add_filter( 'heartbeat_settings', 'wp_heartbeat_settings' );
 336
 337 // Check if the user is logged out
 338 add_action( 'admin_enqueue_scripts', 'wp_auth_check_load' );
 339 add_filter( 'heartbeat_send',        'wp_auth_check' );
 340 add_filter( 'heartbeat_nopriv_send', 'wp_auth_check' );
 341
 342 // Default authentication filters
 343 add_filter( 'authenticate', 'wp_authenticate_username_password',  20, 3 );
 344 add_filter( 'authenticate', 'wp_authenticate_spam_check',         99    );
 345 add_filter( 'determine_current_user', 'wp_validate_auth_cookie'          );
 346 add_filter( 'determine_current_user', 'wp_validate_logged_in_cookie', 20 );
 347
 348 // Split term updates.
 349 add_action( 'admin_init',        '_wp_check_for_scheduled_split_terms' );
 350 add_action( 'split_shared_term', '_wp_check_split_default_terms',  10, 4 );
 351 add_action( 'split_shared_term', '_wp_check_split_terms_in_menus', 10, 4 );
 352 add_action( 'split_shared_term', '_wp_check_split_nav_menu_terms', 10, 4 );
 353 add_action( 'wp_split_shared_term_batch', '_wp_batch_split_terms' );
 354
 355 // Email notifications.
 356 add_action( 'comment_post', 'wp_new_comment_notify_moderator' );
 357 add_action( 'comment_post', 'wp_new_comment_notify_postauthor' );
 358 add_action( 'after_password_reset', 'wp_password_change_notification' );
 359 add_action( 'register_new_user',      'wp_send_new_user_notifications' );
 360 add_action( 'edit_user_created_user', 'wp_send_new_user_notifications', 10, 2 );
 361
 362 // REST API actions.
 363 add_action( 'init',          'rest_api_init' );
 364 add_action( 'rest_api_init', 'rest_api_default_filters', 10, 1 );
 365 add_action( 'parse_request', 'rest_api_loaded' );
 366
 367 /**
 368  * Filters formerly mixed into wp-includes
 369  */
 370 // Theme
 371 add_action( 'wp_loaded', '_custom_header_background_just_in_time' );
 372 add_action( 'plugins_loaded', '_wp_customize_include' );
 373 add_action( 'admin_enqueue_scripts', '_wp_customize_loader_settings' );
 374 add_action( 'delete_attachment', '_delete_attachment_theme_mod' );
 375
 376 // Calendar widget cache
 377 add_action( 'save_post', 'delete_get_calendar_cache' );
 378 add_action( 'delete_post', 'delete_get_calendar_cache' );
 379 add_action( 'update_option_start_of_week', 'delete_get_calendar_cache' );
 380 add_action( 'update_option_gmt_offset', 'delete_get_calendar_cache' );
 381
 382 // Author
 383 add_action( 'transition_post_status', '__clear_multi_author_cache' );
 384
 385 // Post
 386 add_action( 'init', 'create_initial_post_types', 0 ); // highest priority
 387 add_action( 'admin_menu', '_add_post_type_submenus' );
 388 add_action( 'before_delete_post', '_reset_front_page_settings_for_post' );
 389 add_action( 'wp_trash_post',      '_reset_front_page_settings_for_post' );
 390
 391 // Post Formats
 392 add_filter( 'request', '_post_format_request' );
 393 add_filter( 'term_link', '_post_format_link', 10, 3 );
 394 add_filter( 'get_post_format', '_post_format_get_term' );
 395 add_filter( 'get_terms', '_post_format_get_terms', 10, 3 );
 396 add_filter( 'wp_get_object_terms', '_post_format_wp_get_object_terms' );
 397
 398 // KSES
 399 add_action( 'init', 'kses_init' );
 400 add_action( 'set_current_user', 'kses_init' );
 401
 402 // Script Loader
 403 add_action( 'wp_default_scripts', 'wp_default_scripts' );
 404 add_filter( 'wp_print_scripts', 'wp_just_in_time_script_localization' );
 405 add_filter( 'print_scripts_array', 'wp_prototype_before_jquery' );
 406
 407 add_action( 'wp_default_styles', 'wp_default_styles' );
 408 add_filter( 'style_loader_src', 'wp_style_loader_src', 10, 2 );
 409
 410 // Taxonomy
 411 add_action( 'init', 'create_initial_taxonomies', 0 ); // highest priority
 412
 413 // Canonical
 414 add_action( 'template_redirect', 'redirect_canonical' );
 415 add_action( 'template_redirect', 'wp_redirect_admin_locations', 1000 );
 416
 417 // Shortcodes
 418 add_filter( 'the_content', 'do_shortcode', 11 ); // AFTER wpautop()
 419
 420 // Media
 421 add_action( 'wp_playlist_scripts', 'wp_playlist_scripts' );
 422 add_action( 'customize_controls_enqueue_scripts', 'wp_plupload_default_settings' );
 423
 424 // Nav menu
 425 add_filter( 'nav_menu_item_id', '_nav_menu_item_id_use_once', 10, 2 );
 426
 427 // Widgets
 428 add_action( 'init', 'wp_widgets_init', 1 );
 429
 430 // Admin Bar
 431 // Don't remove. Wrong way to disable.
 432 add_action( 'template_redirect', '_wp_admin_bar_init', 0 );
 433 add_action( 'admin_init', '_wp_admin_bar_init' );
 434 add_action( 'before_signup_header', '_wp_admin_bar_init' );
 435 add_action( 'activate_header', '_wp_admin_bar_init' );
 436 add_action( 'wp_footer', 'wp_admin_bar_render', 1000 );
 437 add_action( 'in_admin_header', 'wp_admin_bar_render', 0 );
 438
 439 // Former admin filters that can also be hooked on the front end
 440 add_action( 'media_buttons', 'media_buttons' );
 441 add_filter( 'image_send_to_editor', 'image_add_caption', 20, 8 );
 442 add_filter( 'media_send_to_editor', 'image_media_send_to_editor', 10, 3 );
 443
 444 // Embeds
 445 add_action( 'rest_api_init',          'wp_oembed_register_route'              );
 446 add_filter( 'rest_pre_serve_request', '_oembed_rest_pre_serve_request', 10, 4 );
 447
 448 add_action( 'wp_head',                'wp_oembed_add_discovery_links'         );
 449 add_action( 'wp_head',                'wp_oembed_add_host_js'                 );
 450
 451 add_action( 'embed_head',             'enqueue_embed_scripts',           1    );
 452 add_action( 'embed_head',             'print_emoji_detection_script'          );
 453 add_action( 'embed_head',             'print_embed_styles'                    );
 454 add_action( 'embed_head',             'wp_print_head_scripts',          20    );
 455 add_action( 'embed_head',             'wp_print_styles',                20    );
 456 add_action( 'embed_head',             'wp_no_robots'                          );
 457 add_action( 'embed_head',             'rel_canonical'                         );
 458 add_action( 'embed_head',             'locale_stylesheet'                     );
 459
 460 add_action( 'embed_content_meta',     'print_embed_comments_button'           );
 461 add_action( 'embed_content_meta',     'print_embed_sharing_button'            );
 462
 463 add_action( 'embed_footer',           'print_embed_sharing_dialog'            );
 464 add_action( 'embed_footer',           'print_embed_scripts'                   );
 465 add_action( 'embed_footer',           'wp_print_footer_scripts',        20    );
 466
 467 add_filter( 'excerpt_more',           'wp_embed_excerpt_more',          20    );
 468 add_filter( 'the_excerpt_embed',      'wptexturize'                           );
 469 add_filter( 'the_excerpt_embed',      'convert_chars'                         );
 470 add_filter( 'the_excerpt_embed',      'wpautop'                               );
 471 add_filter( 'the_excerpt_embed',      'shortcode_unautop'                     );
 472 add_filter( 'the_excerpt_embed',      'wp_embed_excerpt_attachment'           );
 473
 474 add_filter( 'oembed_dataparse',       'wp_filter_oembed_result',        10, 3 );
 475 add_filter( 'oembed_response_data',   'get_oembed_response_data_rich',  10, 4 );
 476
 477 unset( $filter, $action );