Title: Classes | Page 6 of 17 | Developer.WordPress.org --- # Classes * class[Status500](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status500/) * Exception for 500 Internal Server Error responses * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status500/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status500/#uses) | Source: [wp-includes/Requests/src/Exception/Http/Status500.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Http/Status500.php#L17-L31) * class[Status501](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status501/) * Exception for 501 Not Implemented responses * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status501/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status501/#uses) | Source: [wp-includes/Requests/src/Exception/Http/Status501.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Http/Status501.php#L17-L31) * class[Status502](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status502/) * Exception for 502 Bad Gateway responses * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status502/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status502/#uses) | Source: [wp-includes/Requests/src/Exception/Http/Status502.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Http/Status502.php#L17-L31) * class[Status503](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status503/) * Exception for 503 Service Unavailable responses * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status503/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status503/#uses) | Source: [wp-includes/Requests/src/Exception/Http/Status503.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Http/Status503.php#L17-L31) * class[Status504](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status504/) * Exception for 504 Gateway Timeout responses * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status504/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status504/#uses) | Source: [wp-includes/Requests/src/Exception/Http/Status504.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Http/Status504.php#L17-L31) * class[Status505](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status505/) * Exception for 505 HTTP Version Not Supported responses * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status505/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status505/#uses) | Source: [wp-includes/Requests/src/Exception/Http/Status505.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Http/Status505.php#L17-L31) * class[Status511](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status511/) * Exception for 511 Network Authentication Required responses * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status511/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-status511/#uses) | Source: [wp-includes/Requests/src/Exception/Http/Status511.php:21](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Http/Status511.php#L21-L35) * class[StatusUnknown](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-statusunknown/) * Exception for unknown status responses * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-statusunknown/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-http-statusunknown/#uses) | Source: [wp-includes/Requests/src/Exception/Http/StatusUnknown.php:18](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Http/StatusUnknown.php#L18-L49) * class[Theme_Installer_Skin](https://developer.wordpress.org/reference/classes/theme_installer_skin/) * Theme Installer Skin for the WordPress Theme Installer. * Used by [0 functions](https://developer.wordpress.org/reference/classes/theme_installer_skin/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/theme_installer_skin/#uses) | Source: [wp-admin/includes/class-theme-installer-skin.php:18](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-theme-installer-skin.php#L18-L400) * class[Theme_Upgrader](https://developer.wordpress.org/reference/classes/theme_upgrader/) * Core class used for upgrading/installing themes. * Used by [0 functions](https://developer.wordpress.org/reference/classes/theme_upgrader/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/theme_upgrader/#uses) | Source: [wp-admin/includes/class-theme-upgrader.php:21](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-theme-upgrader.php#L21-L804) * class[Theme_Upgrader_Skin](https://developer.wordpress.org/reference/classes/theme_upgrader_skin/) * Theme Upgrader Skin for WordPress Theme Upgrades. * Used by [0 functions](https://developer.wordpress.org/reference/classes/theme_upgrader_skin/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/theme_upgrader_skin/#uses) | Source: [wp-admin/includes/class-theme-upgrader-skin.php:18](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-theme-upgrader-skin.php#L18-L144) * class[Tile](https://developer.wordpress.org/reference/classes/avifinfo-tile/) * Used by [0 functions](https://developer.wordpress.org/reference/classes/avifinfo-tile/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/avifinfo-tile/#uses) | Source: [wp-includes/class-avif-info.php:84](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-avif-info.php#L84-L87) * class[Translations](https://developer.wordpress.org/reference/classes/translations/) * Used by [1 function](https://developer.wordpress.org/reference/classes/translations/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/translations/#uses) | Source: [wp-includes/pomo/translations.php:21](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/pomo/translations.php#L21-L247) * class[Translation_Entry](https://developer.wordpress.org/reference/classes/translation_entry/) * Used by [0 functions](https://developer.wordpress.org/reference/classes/translation_entry/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/translation_entry/#uses) | Source: [wp-includes/pomo/entry.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/pomo/entry.php#L17-L124) * class[Transport](https://developer.wordpress.org/reference/classes/wporg-requests-exception-transport/) * Transport Exception * Used by [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-transport/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wporg-requests-exception-transport/#uses) | Source: [wp-includes/Requests/src/Exception/Transport.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Exception/Transport.php#L17-L17) * class[Walker](https://developer.wordpress.org/reference/classes/walker/) * A class for displaying various tree-like structures. * Used by [7 functions](https://developer.wordpress.org/reference/classes/walker/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/walker/#uses) | Source: [wp-includes/class-wp-walker.php:15](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-walker.php#L15-L456) * class[Walker_Category](https://developer.wordpress.org/reference/classes/walker_category/) * Core class used to create an HTML list of categories. * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_category/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_category/#uses) | Source: [wp-includes/class-walker-category.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-walker-category.php#L17-L278) * class[Walker_CategoryDropdown](https://developer.wordpress.org/reference/classes/walker_categorydropdown/) * Core class used to create an HTML dropdown list of Categories. * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_categorydropdown/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_categorydropdown/#uses) | Source: [wp-includes/class-walker-category-dropdown.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-walker-category-dropdown.php#L17-L87) * class[Walker_Category_Checklist](https://developer.wordpress.org/reference/classes/walker_category_checklist/) * Core walker class to output an unordered list of category checkbox input elements. * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_category_checklist/#uses) | Source: [wp-admin/includes/class-walker-category-checklist.php:19](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-walker-category-checklist.php#L19-L140) * class[Walker_Comment](https://developer.wordpress.org/reference/classes/walker_comment/) * Core walker class used to create an HTML list of comments. * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_comment/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_comment/#uses) | Source: [wp-includes/class-walker-comment.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-walker-comment.php#L17-L491) * class[Walker_Nav_Menu](https://developer.wordpress.org/reference/classes/walker_nav_menu/) * Core class used to implement an HTML list of nav menu items. * Used by [2 functions](https://developer.wordpress.org/reference/classes/walker_nav_menu/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_nav_menu/#uses) | Source: [wp-includes/class-walker-nav-menu.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-walker-nav-menu.php#L17-L366) * class[Walker_Nav_Menu_Checklist](https://developer.wordpress.org/reference/classes/walker_nav_menu_checklist/) * Create HTML list of nav menu input items. * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_nav_menu_checklist/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_nav_menu_checklist/#uses) | Source: [wp-admin/includes/class-walker-nav-menu-checklist.php:16](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-walker-nav-menu-checklist.php#L16-L126) * class[Walker_Nav_Menu_Edit](https://developer.wordpress.org/reference/classes/walker_nav_menu_edit/) * Create HTML list of nav menu input items. * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_nav_menu_edit/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_nav_menu_edit/#uses) | Source: [wp-admin/includes/class-walker-nav-menu-edit.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-walker-nav-menu-edit.php#L17-L350) * class[Walker_Page](https://developer.wordpress.org/reference/classes/walker_page/) * Core walker class used to create an HTML list of pages. * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_page/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_page/#uses) | Source: [wp-includes/class-walker-page.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-walker-page.php#L17-L245) * class[Walker_PageDropdown](https://developer.wordpress.org/reference/classes/walker_pagedropdown/) * Core class used to create an HTML drop-down list of pages. * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_pagedropdown/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_pagedropdown/#uses) | Source: [wp-includes/class-walker-page-dropdown.php:17](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-walker-page-dropdown.php#L17-L97) * class[WP](https://developer.wordpress.org/reference/classes/wp/) * WordPress environment setup class. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp/#uses) | Source: [wp-includes/class-wp.php:9](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp.php#L9-L840) * class[wpdb](https://developer.wordpress.org/reference/classes/wpdb/) * Used by [0 functions](https://developer.wordpress.org/reference/classes/wpdb/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wpdb/#uses) | Source: [wp-includes/class-wpdb.php:55](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wpdb.php#L55-L4151) * class[WP_Abilities_Registry](https://developer.wordpress.org/reference/classes/wp_abilities_registry/) * Manages the registration and lookup of abilities. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_abilities_registry/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp_abilities_registry/#uses) | Source: [wp-includes/abilities-api/class-wp-abilities-registry.php:20](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/abilities-api/class-wp-abilities-registry.php#L20-L330) * class[WP_Ability](https://developer.wordpress.org/reference/classes/wp_ability/) * Encapsulates the properties and methods related to a specific ability in the registry. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_ability/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp_ability/#uses) | Source: [wp-includes/abilities-api/class-wp-ability.php:21](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/abilities-api/class-wp-ability.php#L21-L678) * class[WP_Ability_Categories_Registry](https://developer.wordpress.org/reference/classes/wp_ability_categories_registry/) * Manages the registration and lookup of ability categories. * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_ability_categories_registry/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp_ability_categories_registry/#uses) | Source: [wp-includes/abilities-api/class-wp-ability-categories-registry.php:20](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/abilities-api/class-wp-ability-categories-registry.php#L20-L256) [Previous Page](https://developer.wordpress.org/reference/classes/page/5/?output_format=md) 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