map_meta_cap()

💡 云策文档标注

概述

map_meta_cap() 是 WordPress 核心函数，用于将元能力（meta capability）映射为用户所需的原始能力（primitive capabilities）。它不直接检查用户权限，而是返回满足指定能力所需的原始能力数组，常用于自定义权限逻辑或钩子中。

关键要点

函数作用：将元能力（如 edit_post）映射为原始能力（如 edit_posts、edit_others_posts），基于用户 ID 和可选对象 ID（如文章 ID）进行上下文判断。
参数说明：$cap（必需，能力字符串）、$user_id（必需，用户 ID）、$args（可选，额外参数，通常为对象 ID）。
返回值：返回字符串数组，包含用户所需的原始能力；若映射失败或不允许，可能包含 'do_not_allow'。
核心机制：通过 switch 语句处理多种能力类型，包括文章、用户、评论、分类等，考虑对象状态、作者关系、多站点设置等因素。
钩子支持：提供 map_meta_cap 过滤器，允许开发者自定义能力映射逻辑。

代码示例

// 基本用法：检查编辑文章能力所需的原始能力
$caps = map_meta_cap( 'edit_post', $user_id, $post_id );
// 返回可能包含 ['edit_posts', 'edit_published_posts'] 等

// 检查元数据编辑能力
$caps = map_meta_cap( 'edit_post_meta', $user_id, $post_id, $meta_key );

注意事项

此函数仅返回所需能力，不验证用户实际权限；需结合 user_can() 或 current_user_can() 进行完整检查。
对于元能力（如 edit_post），必须提供对象 ID（如 $post_id），否则可能返回 'do_not_allow'。
在多站点环境中，超级管理员权限会影响能力映射，如 delete_user 需要 is_super_admin()。
自定义文章类型可通过 $post_type_meta_caps 全局变量注册元能力映射。

📄 原文内容

Maps a capability to the primitive capabilities required of the given user to satisfy the capability being checked.

Description

This function also accepts an ID of an object to map against if the capability is a meta capability. Meta capabilities such as edit_post and edit_user are capabilities used by this function to map to primitive capabilities that a user or role requires, such as edit_posts and edit_others_posts.

Example usage:

map_meta_cap( 'edit_posts', $user->ID );
map_meta_cap( 'edit_post', $user->ID, $post->ID );
map_meta_cap( 'edit_post_meta', $user->ID, $post->ID, $meta_key );

This function does not check whether the user has the required capabilities, it just returns what the required capabilities are.

Parameters

$capstringrequired: Capability being checked.
$user_idintrequired: User ID.
$argsmixedoptional: Optional further parameters, typically starting with an object ID.

Return

string[] Primitive capabilities required of the user.

Source

function map_meta_cap( $cap, $user_id, ...$args ) {
	$caps = array();

	switch ( $cap ) {
		case 'remove_user':
			// In multisite the user must be a super admin to remove themselves.
			if ( isset( $args[0] ) && $user_id === (int) $args[0] && ! is_super_admin( $user_id ) ) {
				$caps[] = 'do_not_allow';
			} else {
				$caps[] = 'remove_users';
			}
			break;
		case 'promote_user':
		case 'add_users':
			$caps[] = 'promote_users';
			break;
		case 'edit_user':
		case 'edit_users':
			// Non-existent users can't edit users, not even themselves.
			if ( $user_id < 1 ) {
				$caps[] = 'do_not_allow';
				break;
			}

			// Allow user to edit themselves.
			if ( 'edit_user' === $cap && isset( $args[0] ) && $user_id === (int) $args[0] ) {
				break;
			}

			// In multisite the user must have manage_network_users caps. If editing a super admin, the user must be a super admin.
			if ( is_multisite() && ( ( ! is_super_admin( $user_id ) && 'edit_user' === $cap && is_super_admin( $args[0] ) ) || ! user_can( $user_id, 'manage_network_users' ) ) ) {
				$caps[] = 'do_not_allow';
			} else {
				$caps[] = 'edit_users'; // edit_user maps to edit_users.
			}
			break;
		case 'delete_post':
		case 'delete_page':
			if ( ! isset( $args[0] ) ) {
				if ( 'delete_post' === $cap ) {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific post.' );
				} else {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific page.' );
				}

				_doing_it_wrong(
					__FUNCTION__,
					sprintf( $message, '<code>' . $cap . '</code>' ),
					'6.1.0'
				);

				$caps[] = 'do_not_allow';
				break;
			}

			$post = get_post( $args[0] );
			if ( ! $post ) {
				$caps[] = 'do_not_allow';
				break;
			}

			if ( 'revision' === $post->post_type ) {
				$caps[] = 'do_not_allow';
				break;
			}

			if ( (int) get_option( 'page_for_posts' ) === $post->ID
				|| (int) get_option( 'page_on_front' ) === $post->ID
			) {
				$caps[] = 'manage_options';
				break;
			}

			$post_type = get_post_type_object( $post->post_type );
			if ( ! $post_type ) {
				/* translators: 1: Post type, 2: Capability name. */
				$message = __( 'The post type %1$s is not registered, so it may not be reliable to check the capability %2$s against a post of that type.' );

				_doing_it_wrong(
					__FUNCTION__,
					sprintf(
						$message,
						'<code>' . $post->post_type . '</code>',
						'<code>' . $cap . '</code>'
					),
					'4.4.0'
				);

				$caps[] = 'edit_others_posts';
				break;
			}

			if ( ! $post_type->map_meta_cap ) {
				$caps[] = $post_type->cap->$cap;
				// Prior to 3.1 we would re-call map_meta_cap here.
				if ( 'delete_post' === $cap ) {
					$cap = $post_type->cap->$cap;
				}
				break;
			}

			// If the post author is set and the user is the author...
			if ( $post->post_author && $user_id === (int) $post->post_author ) {
				// If the post is published or scheduled...
				if ( in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
					$caps[] = $post_type->cap->delete_published_posts;
				} elseif ( 'trash' === $post->post_status ) {
					$status = get_post_meta( $post->ID, '_wp_trash_meta_status', true );
					if ( in_array( $status, array( 'publish', 'future' ), true ) ) {
						$caps[] = $post_type->cap->delete_published_posts;
					} else {
						$caps[] = $post_type->cap->delete_posts;
					}
				} else {
					// If the post is draft...
					$caps[] = $post_type->cap->delete_posts;
				}
			} else {
				// The user is trying to edit someone else's post.
				$caps[] = $post_type->cap->delete_others_posts;
				// The post is published or scheduled, extra cap required.
				if ( in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
					$caps[] = $post_type->cap->delete_published_posts;
				} elseif ( 'private' === $post->post_status ) {
					$caps[] = $post_type->cap->delete_private_posts;
				}
			}

			/*
			 * Setting the privacy policy page requires `manage_privacy_options`,
			 * so deleting it should require that too.
			 */
			if ( (int) get_option( 'wp_page_for_privacy_policy' ) === $post->ID ) {
				$caps = array_merge( $caps, map_meta_cap( 'manage_privacy_options', $user_id ) );
			}

			break;
		/*
		 * edit_post breaks down to edit_posts, edit_published_posts, or
		 * edit_others_posts.
		 */
		case 'edit_post':
		case 'edit_page':
			if ( ! isset( $args[0] ) ) {
				if ( 'edit_post' === $cap ) {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific post.' );
				} else {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific page.' );
				}

				_doing_it_wrong(
					__FUNCTION__,
					sprintf( $message, '<code>' . $cap . '</code>' ),
					'6.1.0'
				);

				$caps[] = 'do_not_allow';
				break;
			}

			$post = get_post( $args[0] );
			if ( ! $post ) {
				$caps[] = 'do_not_allow';
				break;
			}

			if ( 'revision' === $post->post_type ) {
				$post = get_post( $post->post_parent );
				if ( ! $post ) {
					$caps[] = 'do_not_allow';
					break;
				}
			}

			$post_type = get_post_type_object( $post->post_type );
			if ( ! $post_type ) {
				/* translators: 1: Post type, 2: Capability name. */
				$message = __( 'The post type %1$s is not registered, so it may not be reliable to check the capability %2$s against a post of that type.' );

				_doing_it_wrong(
					__FUNCTION__,
					sprintf(
						$message,
						'<code>' . $post->post_type . '</code>',
						'<code>' . $cap . '</code>'
					),
					'4.4.0'
				);

				$caps[] = 'edit_others_posts';
				break;
			}

			if ( ! $post_type->map_meta_cap ) {
				$caps[] = $post_type->cap->$cap;
				// Prior to 3.1 we would re-call map_meta_cap here.
				if ( 'edit_post' === $cap ) {
					$cap = $post_type->cap->$cap;
				}
				break;
			}

			// If the post author is set and the user is the author...
			if ( $post->post_author && $user_id === (int) $post->post_author ) {
				// If the post is published or scheduled...
				if ( in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
					$caps[] = $post_type->cap->edit_published_posts;
				} elseif ( 'trash' === $post->post_status ) {
					$status = get_post_meta( $post->ID, '_wp_trash_meta_status', true );
					if ( in_array( $status, array( 'publish', 'future' ), true ) ) {
						$caps[] = $post_type->cap->edit_published_posts;
					} else {
						$caps[] = $post_type->cap->edit_posts;
					}
				} else {
					// If the post is draft...
					$caps[] = $post_type->cap->edit_posts;
				}
			} else {
				// The user is trying to edit someone else's post.
				$caps[] = $post_type->cap->edit_others_posts;
				// The post is published or scheduled, extra cap required.
				if ( in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
					$caps[] = $post_type->cap->edit_published_posts;
				} elseif ( 'private' === $post->post_status ) {
					$caps[] = $post_type->cap->edit_private_posts;
				}
			}

			/*
			 * Setting the privacy policy page requires `manage_privacy_options`,
			 * so editing it should require that too.
			 */
			if ( (int) get_option( 'wp_page_for_privacy_policy' ) === $post->ID ) {
				$caps = array_merge( $caps, map_meta_cap( 'manage_privacy_options', $user_id ) );
			}

			break;
		case 'read_post':
		case 'read_page':
			if ( ! isset( $args[0] ) ) {
				if ( 'read_post' === $cap ) {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific post.' );
				} else {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific page.' );
				}

				_doing_it_wrong(
					__FUNCTION__,
					sprintf( $message, '<code>' . $cap . '</code>' ),
					'6.1.0'
				);

				$caps[] = 'do_not_allow';
				break;
			}

			$post = get_post( $args[0] );
			if ( ! $post ) {
				$caps[] = 'do_not_allow';
				break;
			}

			if ( 'revision' === $post->post_type ) {
				$post = get_post( $post->post_parent );
				if ( ! $post ) {
					$caps[] = 'do_not_allow';
					break;
				}
			}

			$post_type = get_post_type_object( $post->post_type );
			if ( ! $post_type ) {
				/* translators: 1: Post type, 2: Capability name. */
				$message = __( 'The post type %1$s is not registered, so it may not be reliable to check the capability %2$s against a post of that type.' );

				_doing_it_wrong(
					__FUNCTION__,
					sprintf(
						$message,
						'<code>' . $post->post_type . '</code>',
						'<code>' . $cap . '</code>'
					),
					'4.4.0'
				);

				$caps[] = 'edit_others_posts';
				break;
			}

			if ( ! $post_type->map_meta_cap ) {
				$caps[] = $post_type->cap->$cap;
				// Prior to 3.1 we would re-call map_meta_cap here.
				if ( 'read_post' === $cap ) {
					$cap = $post_type->cap->$cap;
				}
				break;
			}

			$status_obj = get_post_status_object( get_post_status( $post ) );
			if ( ! $status_obj ) {
				/* translators: 1: Post status, 2: Capability name. */
				$message = __( 'The post status %1$s is not registered, so it may not be reliable to check the capability %2$s against a post with that status.' );

				_doing_it_wrong(
					__FUNCTION__,
					sprintf(
						$message,
						'<code>' . get_post_status( $post ) . '</code>',
						'<code>' . $cap . '</code>'
					),
					'5.4.0'
				);

				$caps[] = 'edit_others_posts';
				break;
			}

			if ( $status_obj->public ) {
				$caps[] = $post_type->cap->read;
				break;
			}

			if ( $post->post_author && $user_id === (int) $post->post_author ) {
				$caps[] = $post_type->cap->read;
			} elseif ( $status_obj->private ) {
				$caps[] = $post_type->cap->read_private_posts;
			} else {
				$caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
			}
			break;
		case 'publish_post':
			if ( ! isset( $args[0] ) ) {
				/* translators: %s: Capability name. */
				$message = __( 'When checking for the %s capability, you must always check it against a specific post.' );

				_doing_it_wrong(
					__FUNCTION__,
					sprintf( $message, '<code>' . $cap . '</code>' ),
					'6.1.0'
				);

				$caps[] = 'do_not_allow';
				break;
			}

			$post = get_post( $args[0] );
			if ( ! $post ) {
				$caps[] = 'do_not_allow';
				break;
			}

			$post_type = get_post_type_object( $post->post_type );
			if ( ! $post_type ) {
				/* translators: 1: Post type, 2: Capability name. */
				$message = __( 'The post type %1$s is not registered, so it may not be reliable to check the capability %2$s against a post of that type.' );

				_doing_it_wrong(
					__FUNCTION__,
					sprintf(
						$message,
						'<code>' . $post->post_type . '</code>',
						'<code>' . $cap . '</code>'
					),
					'4.4.0'
				);

				$caps[] = 'edit_others_posts';
				break;
			}

			$caps[] = $post_type->cap->publish_posts;
			break;
		case 'edit_post_meta':
		case 'delete_post_meta':
		case 'add_post_meta':
		case 'edit_comment_meta':
		case 'delete_comment_meta':
		case 'add_comment_meta':
		case 'edit_term_meta':
		case 'delete_term_meta':
		case 'add_term_meta':
		case 'edit_user_meta':
		case 'delete_user_meta':
		case 'add_user_meta':
			$object_type = explode( '_', $cap )[1];

			if ( ! isset( $args[0] ) ) {
				if ( 'post' === $object_type ) {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific post.' );
				} elseif ( 'comment' === $object_type ) {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific comment.' );
				} elseif ( 'term' === $object_type ) {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific term.' );
				} else {
					/* translators: %s: Capability name. */
					$message = __( 'When checking for the %s capability, you must always check it against a specific user.' );
				}

				_doing_it_wrong(
					__FUNCTION__,
					sprintf( $message, '<code>' . $cap . '</code>' ),
					'6.1.0'
				);

				$caps[] = 'do_not_allow';
				break;
			}

			$object_id = (int) $args[0];

			$object_subtype = get_object_subtype( $object_type, $object_id );

			if ( empty( $object_subtype ) ) {
				$caps[] = 'do_not_allow';
				break;
			}

			$caps = map_meta_cap( "edit_{$object_type}", $user_id, $object_id );

			$meta_key = isset( $args[1] ) ? $args[1] : false;

			if ( $meta_key ) {
				$allowed = ! is_protected_meta( $meta_key, $object_type );

				if ( has_filter( "auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}" ) ) {

					/**
					 * Filters whether the user is allowed to edit a specific meta key of a specific object type and subtype.
					 *
					 * The dynamic portions of the hook name, `$object_type`, `$meta_key`,
					 * and `$object_subtype`, refer to the metadata object type (comment, post, term or user),
					 * the meta key value, and the object subtype respectively.
					 *
					 * @since 4.9.8
					 *
					 * @param bool     $allowed   Whether the user can add the object meta. Default false.
					 * @param string   $meta_key  The meta key.
					 * @param int      $object_id Object ID.
					 * @param int      $user_id   User ID.
					 * @param string   $cap       Capability name.
					 * @param string[] $caps      Array of the user's capabilities.
					 */
					$allowed = apply_filters( "auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $allowed, $meta_key, $object_id, $user_id, $cap, $caps );
				} else {

					/**
					 * Filters whether the user is allowed to edit a specific meta key of a specific object type.
					 *
					 * Return true to have the mapped meta caps from `edit_{$object_type}` apply.
					 *
					 * The dynamic portion of the hook name, `$object_type` refers to the object type being filtered.
					 * The dynamic portion of the hook name, `$meta_key`, refers to the meta key passed to map_meta_cap().
					 *
					 * @since 3.3.0 As `auth_post_meta_{$meta_key}`.
					 * @since 4.6.0
					 *
					 * @param bool     $allowed   Whether the user can add the object meta. Default false.
					 * @param string   $meta_key  The meta key.
					 * @param int      $object_id Object ID.
					 * @param int      $user_id   User ID.
					 * @param string   $cap       Capability name.
					 * @param string[] $caps      Array of the user's capabilities.
					 */
					$allowed = apply_filters( "auth_{$object_type}_meta_{$meta_key}", $allowed, $meta_key, $object_id, $user_id, $cap, $caps );
				}

				/**
				 * Filters whether the user is allowed to edit meta for specific object types/subtypes.
				 *
				 * Return true to have the mapped meta caps from `edit_{$object_type}` apply.
				 *
				 * The dynamic portion of the hook name, `$object_type` refers to the object type being filtered.
				 * The dynamic portion of the hook name, `$object_subtype` refers to the object subtype being filtered.
				 * The dynamic portion of the hook name, `$meta_key`, refers to the meta key passed to map_meta_cap().
				 *
				 * @since 4.6.0 As `auth_post_{$post_type}_meta_{$meta_key}`.
				 * @since 4.7.0 Renamed from `auth_post_{$post_type}_meta_{$meta_key}` to
				 *              `auth_{$object_type}_{$object_subtype}_meta_{$meta_key}`.
				 * @deprecated 4.9.8 Use 'auth_{$object_type_meta_{$meta_key}_for_{$object_subtype}'} instead.
				 *
				 * @param bool     $allowed   Whether the user can add the object meta. Default false.
				 * @param string   $meta_key  The meta key.
				 * @param int      $object_id Object ID.
				 * @param int      $user_id   User ID.
				 * @param string   $cap       Capability name.
				 * @param string[] $caps      Array of the user's capabilities.
				 */
				$allowed = apply_filters_deprecated(
					"auth_{$object_type}_{$object_subtype}_meta_{$meta_key}",
					array( $allowed, $meta_key, $object_id, $user_id, $cap, $caps ),
					'4.9.8',
					"auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}"
				);

				if ( ! $allowed ) {
					$caps[] = $cap;
				}
			}
			break;
		case 'edit_comment':
			if ( ! isset( $args[0] ) ) {
				/* translators: %s: Capability name. */
				$message = __( 'When checking for the %s capability, you must always check it against a specific comment.' );

				_doing_it_wrong(
					__FUNCTION__,
					sprintf( $message, '<code>' . $cap . '</code>' ),
					'6.1.0'
				);

				$caps[] = 'do_not_allow';
				break;
			}

			$comment = get_comment( $args[0] );
			if ( ! $comment ) {
				$caps[] = 'do_not_allow';
				break;
			}

			$post = get_post( $comment->comment_post_ID );

			/*
			 * If the post doesn't exist, we have an orphaned comment.
			 * Fall back to the edit_posts capability, instead.
			 */
			if ( $post ) {
				$caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
			} else {
				$caps = map_meta_cap( 'edit_posts', $user_id );
			}
			break;
		case 'unfiltered_upload':
			if ( defined( 'ALLOW_UNFILTERED_UPLOADS' ) && ALLOW_UNFILTERED_UPLOADS && ( ! is_multisite() || is_super_admin( $user_id ) ) ) {
				$caps[] = $cap;
			} else {
				$caps[] = 'do_not_allow';
			}
			break;
		case 'edit_css':
		case 'unfiltered_html':
			// Disallow unfiltered_html for all users, even admins and super admins.
			if ( defined( 'DISALLOW_UNFILTERED_HTML' ) && DISALLOW_UNFILTERED_HTML ) {
				$caps[] = 'do_not_allow';
			} elseif ( is_multisite() && ! is_super_admin( $user_id ) ) {
				$caps[] = 'do_not_allow';
			} else {
				$caps[] = 'unfiltered_html';
			}
			break;
		case 'edit_files':
		case 'edit_plugins':
		case 'edit_themes':
			// Disallow the file editors.
			if ( defined( 'DISALLOW_FILE_EDIT' ) && DISALLOW_FILE_EDIT ) {
				$caps[] = 'do_not_allow';
			} elseif ( ! wp_is_file_mod_allowed( 'capability_edit_themes' ) ) {
				$caps[] = 'do_not_allow';
			} elseif ( is_multisite() && ! is_super_admin( $user_id ) ) {
				$caps[] = 'do_not_allow';
			} else {
				$caps[] = $cap;
			}
			break;
		case 'update_plugins':
		case 'delete_plugins':
		case 'install_plugins':
		case 'upload_plugins':
		case 'update_themes':
		case 'delete_themes':
		case 'install_themes':
		case 'upload_themes':
		case 'update_core':
			/*
			 * Disallow anything that creates, deletes, or updates core, plugin, or theme files.
			 * Files in uploads are excepted.
			 */
			if ( ! wp_is_file_mod_allowed( 'capability_update_core' ) ) {
				$caps[] = 'do_not_allow';
			} elseif ( is_multisite() && ! is_super_admin( $user_id ) ) {
				$caps[] = 'do_not_allow';
			} elseif ( 'upload_themes' === $cap ) {
				$caps[] = 'install_themes';
			} elseif ( 'upload_plugins' === $cap ) {
				$caps[] = 'install_plugins';
			} else {
				$caps[] = $cap;
			}
			break;
		case 'install_languages':
		case 'update_languages':
			if ( ! wp_is_file_mod_allowed( 'can_install_language_pack' ) ) {
				$caps[] = 'do_not_allow';
			} elseif ( is_multisite() && ! is_super_admin( $user_id ) ) {
				$caps[] = 'do_not_allow';
			} else {
				$caps[] = 'install_languages';
			}
			break;
		case 'activate_plugins':
		case 'deactivate_plugins':
		case 'activate_plugin':
		case 'deactivate_plugin':
			$caps[] = 'activate_plugins';
			if ( is_multisite() ) {
				// update_, install_, and delete_ are handled above with is_super_admin().
				$menu_perms = get_site_option( 'menu_items', array() );
				if ( empty( $menu_perms['plugins'] ) ) {
					$caps[] = 'manage_network_plugins';
				}
			}
			break;
		case 'resume_plugin':
			$caps[] = 'resume_plugins';
			break;
		case 'resume_theme':
			$caps[] = 'resume_themes';
			break;
		case 'delete_user':
		case 'delete_users':
			// If multisite only super admins can delete users.
			if ( is_multisite() && ! is_super_admin( $user_id ) ) {
				$caps[] = 'do_not_allow';
			} else {
				$caps[] = 'delete_users'; // delete_user maps to delete_users.
			}
			break;
		case 'create_users':
			if ( ! is_multisite() ) {
				$caps[] = $cap;
			} elseif ( is_super_admin( $user_id ) || get_site_option( 'add_new_users' ) ) {
				$caps[] = $cap;
			} else {
				$caps[] = 'do_not_allow';
			}
			break;
		case 'manage_links':
			if ( get_option( 'link_manager_enabled' ) ) {
				$caps[] = $cap;
			} else {
				$caps[] = 'do_not_allow';
			}
			break;
		case 'customize':
			$caps[] = 'edit_theme_options';
			break;
		case 'delete_site':
			if ( is_multisite() ) {
				$caps[] = 'manage_options';
			} else {
				$caps[] = 'do_not_allow';
			}
			break;
		case 'edit_term':
		case 'delete_term':
		case 'assign_term':
			if ( ! isset( $args[0] ) ) {
				/* translators: %s: Capability name. */
				$message = __( 'When checking for the %s capability, you must always check it against a specific term.' );

				_doing_it_wrong(
					__FUNCTION__,
					sprintf( $message, '<code>' . $cap . '</code>' ),
					'6.1.0'
				);

				$caps[] = 'do_not_allow';
				break;
			}

			$term_id = (int) $args[0];
			$term    = get_term( $term_id );
			if ( ! $term || is_wp_error( $term ) ) {
				$caps[] = 'do_not_allow';
				break;
			}

			$tax = get_taxonomy( $term->taxonomy );
			if ( ! $tax ) {
				$caps[] = 'do_not_allow';
				break;
			}

			if ( 'delete_term' === $cap
				&& ( (int) get_option( 'default_' . $term->taxonomy ) === $term->term_id
					|| (int) get_option( 'default_term_' . $term->taxonomy ) === $term->term_id )
			) {
				$caps[] = 'do_not_allow';
				break;
			}

			$taxo_cap = $cap . 's';

			$caps = map_meta_cap( $tax->cap->$taxo_cap, $user_id, $term_id );

			break;
		case 'manage_post_tags':
		case 'edit_categories':
		case 'edit_post_tags':
		case 'delete_categories':
		case 'delete_post_tags':
			$caps[] = 'manage_categories';
			break;
		case 'assign_categories':
		case 'assign_post_tags':
			$caps[] = 'edit_posts';
			break;
		case 'create_sites':
		case 'delete_sites':
		case 'manage_network':
		case 'manage_sites':
		case 'manage_network_users':
		case 'manage_network_plugins':
		case 'manage_network_themes':
		case 'manage_network_options':
		case 'upgrade_network':
			$caps[] = $cap;
			break;
		case 'setup_network':
			if ( is_multisite() ) {
				$caps[] = 'manage_network_options';
			} else {
				$caps[] = 'manage_options';
			}
			break;
		case 'update_php':
			if ( is_multisite() && ! is_super_admin( $user_id ) ) {
				$caps[] = 'do_not_allow';
			} else {
				$caps[] = 'update_core';
			}
			break;
		case 'update_https':
			if ( is_multisite() && ! is_super_admin( $user_id ) ) {
				$caps[] = 'do_not_allow';
			} else {
				$caps[] = 'manage_options';
				$caps[] = 'update_core';
			}
			break;
		case 'export_others_personal_data':
		case 'erase_others_personal_data':
		case 'manage_privacy_options':
			$caps[] = is_multisite() ? 'manage_network' : 'manage_options';
			break;
		case 'create_app_password':
		case 'list_app_passwords':
		case 'read_app_password':
		case 'edit_app_password':
		case 'delete_app_passwords':
		case 'delete_app_password':
			$caps = map_meta_cap( 'edit_user', $user_id, $args[0] );
			break;
		case 'edit_block_binding':
			$block_editor_context = $args[0];
			if ( isset( $block_editor_context->post ) ) {
				$object_id = $block_editor_context->post->ID;
			}
			/*
			 * If the post ID is null, check if the context is the site editor.
			 * Fall back to the edit_theme_options in that case.
			 */
			if ( ! isset( $object_id ) ) {
				if ( ! isset( $block_editor_context->name ) || 'core/edit-site' !== $block_editor_context->name ) {
					$caps[] = 'do_not_allow';
					break;
				}
				$caps = map_meta_cap( 'edit_theme_options', $user_id );
				break;
			}

			$object_subtype = get_object_subtype( 'post', (int) $object_id );
			if ( empty( $object_subtype ) ) {
				$caps[] = 'do_not_allow';
				break;
			}
			$post_type_object = get_post_type_object( $object_subtype );
			// Initialize empty array if it doesn't exist.
			if ( ! isset( $post_type_object->capabilities ) ) {
				$post_type_object->capabilities = array();
			}
			$post_type_capabilities = get_post_type_capabilities( $post_type_object );
			$caps                   = map_meta_cap( $post_type_capabilities->edit_post, $user_id, $object_id );
			break;
		default:
			// Handle meta capabilities for custom post types.
			global $post_type_meta_caps;
			if ( isset( $post_type_meta_caps[ $cap ] ) ) {
				return map_meta_cap( $post_type_meta_caps[ $cap ], $user_id, ...$args );
			}

			// Block capabilities map to their post equivalent.
			$block_caps = array(
				'edit_blocks',
				'edit_others_blocks',
				'publish_blocks',
				'read_private_blocks',
				'delete_blocks',
				'delete_private_blocks',
				'delete_published_blocks',
				'delete_others_blocks',
				'edit_private_blocks',
				'edit_published_blocks',
			);
			if ( in_array( $cap, $block_caps, true ) ) {
				$cap = str_replace( '_blocks', '_posts', $cap );
			}

			// If no meta caps match, return the original cap.
			$caps[] = $cap;
	}

	/**
	 * Filters the primitive capabilities required of the given user to satisfy the
	 * capability being checked.
	 *
	 * @since 2.8.0
	 *
	 * @param string[] $caps    Primitive capabilities required of the user.
	 * @param string   $cap     Capability being checked.
	 * @param int      $user_id The user ID.
	 * @param array    $args    Adds context to the capability check, typically
	 *                          starting with an object ID.
	 */
	return apply_filters( 'map_meta_cap', $caps, $cap, $user_id, $args );
}

View all references View on Trac View on GitHub

Hooks

apply_filters( “auth_{$object_type}_meta_{$meta_key}”, bool $allowed, string $meta_key, int $object_id, int $user_id, string $cap, string[] $caps ): Filters whether the user is allowed to edit a specific meta key of a specific object type.
apply_filters( “auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}”, bool $allowed, string $meta_key, int $object_id, int $user_id, string $cap, string[] $caps ): Filters whether the user is allowed to edit a specific meta key of a specific object type and subtype.
apply_filters_deprecated( “auth_{$object_type}_{$object_subtype}_meta_{$meta_key}”, bool $allowed, string $meta_key, int $object_id, int $user_id, string $cap, string[] $caps ): Filters whether the user is allowed to edit meta for specific object types/subtypes.
apply_filters( ‘map_meta_cap’, string[] $caps, string $cap, int $user_id, array $args ): Filters the primitive capabilities required of the given user to satisfy the capability being checked.

Uses	Description
get_object_subtype()`wp-includes/meta.php`	Returns the object subtype for a given object ID of a specific type.
wp_is_file_mod_allowed()`wp-includes/load.php`	Determines whether file modifications are allowed.
apply_filters_deprecated()`wp-includes/plugin.php`	Fires functions attached to a deprecated filter hook.
is_super_admin()`wp-includes/capabilities.php`	Determines whether user is a site admin.
user_can()`wp-includes/capabilities.php`	Returns whether a particular user has the specified capability.
map_meta_cap()`wp-includes/capabilities.php`	Maps a capability to the primitive capabilities required of the given user to satisfy the capability being checked.
has_filter()`wp-includes/plugin.php`	Checks if any filter has been registered for a hook.
get_post_type_capabilities()`wp-includes/post.php`	Builds an object with all post type capabilities out of a post type object
get_post_status_object()`wp-includes/post.php`	Retrieves a post status object by name.
get_post_status()`wp-includes/post.php`	Retrieves the post status based on the post ID.
is_protected_meta()`wp-includes/meta.php`	Determines whether a meta key is considered protected.
__()`wp-includes/l10n.php`	Retrieves the translation of $text.
is_multisite()`wp-includes/load.php`	Determines whether Multisite is enabled.
_doing_it_wrong()`wp-includes/functions.php`	Marks something as being incorrectly called.
get_taxonomy()`wp-includes/taxonomy.php`	Retrieves the taxonomy object of $taxonomy.
get_term()`wp-includes/taxonomy.php`	Gets all term data from database by term ID.
apply_filters()`wp-includes/plugin.php`	Calls the callback functions that have been added to a filter hook.
get_site_option()`wp-includes/option.php`	Retrieve an option value for the current network based on name of option.
get_option()`wp-includes/option.php`	Retrieves an option value based on an option name.
get_post_meta()`wp-includes/post.php`	Retrieves a post meta field for the given post ID.
get_post()`wp-includes/post.php`	Retrieves post data given a post ID or post object.
get_post_type_object()`wp-includes/post.php`	Retrieves a post type object by name.
get_comment()`wp-includes/comment.php`	Retrieves comment data given a comment ID or comment object.
is_wp_error()`wp-includes/load.php`	Checks whether the given variable is a WordPress Error.

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Used by	Description
WP_Customize_Manager::grant_edit_post_capability_for_changeset()`wp-includes/class-wp-customize-manager.php`	Re-maps ‘edit_post’ meta cap for a customize_changeset post to be the same as ‘customize’ maps.
WP_User::has_cap()`wp-includes/class-wp-user.php`	Returns whether the user has the specified capability.
map_meta_cap()`wp-includes/capabilities.php`	Maps a capability to the primitive capabilities required of the given user to satisfy the capability being checked.

Changelog

Version	Description
6.7.0	Added the `edit_block_binding` capability.
5.7.0	Added the `create_app_password`, `list_app_passwords`, `read_app_password`, `edit_app_password`, `delete_app_passwords`, `delete_app_password`, and `update_https` capabilities.
5.3.0	Formalized the existing and already documented `...$args` parameter by adding it to the function signature.
5.2.0	Added the `resume_plugin` and `resume_theme` capabilities.
5.1.0	Added the `update_php` capability.
4.9.6	Added the `export_others_personal_data`, `erase_others_personal_data`, and `manage_privacy_options` capabilities.
2.0.0	Introduced.

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map_meta_cap()

概述

关键要点

代码示例

注意事项

Description

Parameters

Return

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Changelog

函数文档

概述

关键要点

代码示例

注意事项

Description

Parameters

Return

Source

Hooks

Related

Changelog