Title: 5.5.0 | Developer.WordPress.org --- # New and updated in 5.5.0 Functions Hooks Classes Methods * method[IXR_ClientMulticall::addCall()](https://developer.wordpress.org/reference/classes/ixr_clientmulticall/addcall/) * Used by [0 functions](https://developer.wordpress.org/reference/classes/ixr_clientmulticall/addcall/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/ixr_clientmulticall/addcall/#uses) | Source: [wp-includes/IXR/class-IXR-clientmulticall.php:33](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/IXR/class-IXR-clientmulticall.php#L33-L41) * method[IXR_ClientMulticall::query()](https://developer.wordpress.org/reference/classes/ixr_clientmulticall/query/) * Used by [0 functions](https://developer.wordpress.org/reference/classes/ixr_clientmulticall/query/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/ixr_clientmulticall/query/#uses) | Source: [wp-includes/IXR/class-IXR-clientmulticall.php:50](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/IXR/class-IXR-clientmulticall.php#L50-L54) * method[IXR_Client::query()](https://developer.wordpress.org/reference/classes/ixr_client/query/) * Used by [1 function](https://developer.wordpress.org/reference/classes/ixr_client/query/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/classes/ixr_client/query/#uses) | Source: [wp-includes/IXR/class-IXR-client.php:68](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/IXR/class-IXR-client.php#L68-L150) * method[WP_Comments_List_Table::comment_type_dropdown()](https://developer.wordpress.org/reference/classes/wp_comments_list_table/comment_type_dropdown/) * Displays a comment type drop-down for filtering on the Comments list table. * Used by [1 function](https://developer.wordpress.org/reference/classes/wp_comments_list_table/comment_type_dropdown/#used-by) | Uses [6 functions](https://developer.wordpress.org/reference/classes/wp_comments_list_table/comment_type_dropdown/#uses) | Source: [wp-admin/includes/class-wp-comments-list-table.php:502](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-wp-comments-list-table.php#L502-L548) * hook[lostpassword_errors](https://developer.wordpress.org/reference/hooks/lostpassword_errors/) * Filters the errors encountered on a password reset request. * Used by [1 function](https://developer.wordpress.org/reference/hooks/lostpassword_errors/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/lostpassword_errors/#uses) | Source: [wp-includes/user.php:3271](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/user.php#L3271-L3271) * function[esc_xml()](https://developer.wordpress.org/reference/functions/esc_xml/) * Escaping for XML blocks. * Used by [5 functions](https://developer.wordpress.org/reference/functions/esc_xml/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/esc_xml/#uses) | Source: [wp-includes/formatting.php:4760](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/formatting.php#L4760-L4807) * hook[esc_xml](https://developer.wordpress.org/reference/hooks/esc_xml/) * Filters a string cleaned and escaped for output in XML. * Used by [1 function](https://developer.wordpress.org/reference/hooks/esc_xml/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/esc_xml/#uses) | Source: [wp-includes/formatting.php:4806](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/formatting.php#L4806-L4806) * hook[navigation_widgets_format](https://developer.wordpress.org/reference/hooks/navigation_widgets_format/) * Filters the HTML format of widgets with navigation links. * Used by [9 functions](https://developer.wordpress.org/reference/hooks/navigation_widgets_format/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/navigation_widgets_format/#uses) | Source: [wp-includes/widgets/class-wp-nav-menu-widget.php:72](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/widgets/class-wp-nav-menu-widget.php#L72-L72) * hook[saved_term](https://developer.wordpress.org/reference/hooks/saved_term/) * Fires after a term has been saved, and the term cache has been cleared. * Used by [2 functions](https://developer.wordpress.org/reference/hooks/saved_term/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/saved_term/#uses) | Source: [wp-includes/taxonomy.php:2764](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/taxonomy.php#L2764-L2764) * hook[saved_{$taxonomy}](https://developer.wordpress.org/reference/hooks/saved_taxonomy/) * Fires after a term in a specific taxonomy has been saved, and the term cache has been cleared. * Used by [2 functions](https://developer.wordpress.org/reference/hooks/saved_taxonomy/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/saved_taxonomy/#uses) | Source: [wp-includes/taxonomy.php:2785](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/taxonomy.php#L2785-L2785) * method[WP_Block_Patterns_Registry::get_registered()](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_registered/) * Retrieves an array containing the properties of a registered block pattern. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_registered/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_registered/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:193](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L193-L207) * method[WP_Block_Patterns_Registry::get_all_registered()](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_all_registered/) * Retrieves all registered block patterns. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_all_registered/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_all_registered/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:218](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L218-L234) * method[WP_Block_Patterns_Registry::is_registered()](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/is_registered/) * Checks if a block pattern is registered. * Used by [2 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/is_registered/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/is_registered/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:244](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L244-L246) * method[WP_Block_Patterns_Registry::get_instance()](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_instance/) * Utility method to retrieve the main instance of the class. * Used by [7 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_instance/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/get_instance/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:272](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L272-L278) * method[WP_Block_Patterns_Registry::unregister()](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/unregister/) * Unregisters a block pattern. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/unregister/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/unregister/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:144](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L144-L159) * method[WP_Taxonomy::get_rest_controller()](https://developer.wordpress.org/reference/classes/wp_taxonomy/get_rest_controller/) * Gets the REST API controller for this taxonomy. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_taxonomy/get_rest_controller/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp_taxonomy/get_rest_controller/#uses) | Source: [wp-includes/class-wp-taxonomy.php:569](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-taxonomy.php#L569-L593) * function[register_block_pattern()](https://developer.wordpress.org/reference/functions/register_block_pattern/) * Registers a new block pattern. * Used by [5 functions](https://developer.wordpress.org/reference/functions/register_block_pattern/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/register_block_pattern/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:291](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L291-L293) * function[unregister_block_pattern()](https://developer.wordpress.org/reference/functions/unregister_block_pattern/) * Unregisters a block pattern. * Used by [0 functions](https://developer.wordpress.org/reference/functions/unregister_block_pattern/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/unregister_block_pattern/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:303](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L303-L305) * class[WP_Block_Patterns_Registry](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/) * Class used for interacting with block patterns. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:16](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L16-L279) * method[WP_Block_Patterns_Registry::register()](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/register/) * Registers a block pattern. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/register/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/classes/wp_block_patterns_registry/register/#uses) | Source: [wp-includes/class-wp-block-patterns-registry.php:89](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-patterns-registry.php#L89-L134) * function[_register_core_block_patterns_and_categories()](https://developer.wordpress.org/reference/functions/_register_core_block_patterns_and_categories/) * Registers the core block patterns and categories. * Used by [0 functions](https://developer.wordpress.org/reference/functions/_register_core_block_patterns_and_categories/#used-by) | Uses [5 functions](https://developer.wordpress.org/reference/functions/_register_core_block_patterns_and_categories/#uses) | Source: [wp-includes/block-patterns.php:18](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/block-patterns.php#L18-L178) * function[_wp_register_meta_args_allowed_list()](https://developer.wordpress.org/reference/functions/_wp_register_meta_args_allowed_list/) * Filters out `register_meta()` args based on an allowed list. * Used by [1 function](https://developer.wordpress.org/reference/functions/_wp_register_meta_args_allowed_list/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/_wp_register_meta_args_allowed_list/#uses) | Source: [wp-includes/meta.php:1780](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/meta.php#L1780-L1782) * function[filter_default_metadata()](https://developer.wordpress.org/reference/functions/filter_default_metadata/) * Filters into default_{$object_type}_metadata and adds in default value. * Used by [0 functions](https://developer.wordpress.org/reference/functions/filter_default_metadata/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/filter_default_metadata/#uses) | Source: [wp-includes/meta.php:1584](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/meta.php#L1584-L1626) * function[get_metadata_default()](https://developer.wordpress.org/reference/functions/get_metadata_default/) * Retrieves default metadata value for the specified meta key and object. * Used by [1 function](https://developer.wordpress.org/reference/functions/get_metadata_default/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/get_metadata_default/#uses) | Source: [wp-includes/meta.php:716](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/meta.php#L716-L754) * hook[default_{$meta_type}_metadata](https://developer.wordpress.org/reference/hooks/default_meta_type_metadata/) * Filters the default metadata value for a specified meta key and object. * Used by [1 function](https://developer.wordpress.org/reference/hooks/default_meta_type_metadata/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/default_meta_type_metadata/#uses) | Source: [wp-includes/meta.php:747](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/meta.php#L747-L747) * function[get_metadata_raw()](https://developer.wordpress.org/reference/functions/get_metadata_raw/) * Retrieves raw metadata value for the specified object. * Used by [6 functions](https://developer.wordpress.org/reference/functions/get_metadata_raw/#used-by) | Uses [5 functions](https://developer.wordpress.org/reference/functions/get_metadata_raw/#uses) | Source: [wp-includes/meta.php:628](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/meta.php#L628-L697) * function[register_block_pattern_category()](https://developer.wordpress.org/reference/functions/register_block_pattern_category/) * Registers a new pattern category. * Used by [1 function](https://developer.wordpress.org/reference/functions/register_block_pattern_category/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/register_block_pattern_category/#uses) | Source: [wp-includes/class-wp-block-pattern-categories-registry.php:177](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-pattern-categories-registry.php#L177-L179) * function[unregister_block_pattern_category()](https://developer.wordpress.org/reference/functions/unregister_block_pattern_category/) * Unregisters a pattern category. * Used by [0 functions](https://developer.wordpress.org/reference/functions/unregister_block_pattern_category/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/unregister_block_pattern_category/#uses) | Source: [wp-includes/class-wp-block-pattern-categories-registry.php:189](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-pattern-categories-registry.php#L189-L191) * method[WP_Block_Pattern_Categories_Registry::register()](https://developer.wordpress.org/reference/classes/wp_block_pattern_categories_registry/register/) * Registers a pattern category. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_block_pattern_categories_registry/register/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/classes/wp_block_pattern_categories_registry/register/#uses) | Source: [wp-includes/class-wp-block-pattern-categories-registry.php:52](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-pattern-categories-registry.php#L52-L77) * method[WP_Block_Pattern_Categories_Registry::unregister()](https://developer.wordpress.org/reference/classes/wp_block_pattern_categories_registry/unregister/) * Unregisters a pattern category. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_block_pattern_categories_registry/unregister/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/classes/wp_block_pattern_categories_registry/unregister/#uses) | Source: [wp-includes/class-wp-block-pattern-categories-registry.php:87](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-block-pattern-categories-registry.php#L87-L102) 1 [2](https://developer.wordpress.org/reference/since/5.5.0/page/2/?output_format=md) [3](https://developer.wordpress.org/reference/since/5.5.0/page/3/?output_format=md)… [14](https://developer.wordpress.org/reference/since/5.5.0/page/14/?output_format=md) [Next 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