如何使用流式排版实现WordPress自由缩放字体
map_meta_cap ( $cap, $user_id, $args )
map_meta_cap: 这是WordPress中的一个过滤钩子，允许你修改在WordPress中执行一个特定动作所需的权限。它用于将一个元权限（一般的用户动作）映射到一个特定的权限（一个特定用户角色的权限）。这个钩子可以根据用户的角色或其他标准，用来增加或删除特定动作的权限。
将一个权限映射到给定用户所需的原始权限，以满足被检查的权限。
如果权限是元权限，这个函数也接受一个要映射的对象的ID。元权限，如`edit_post`和`edit_user`是这个函数用来映射到用户或角色需要的原始权限，如`edit_posts`和`edit_others_posts`。
使用实例：
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 ) 。
这个函数并不检查用户是否具有所需的权限。
它只是返回所需的权限。
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 == $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':
// Allow user to edit themselves.
if ( 'edit_user' === $cap && isset( $args[0] ) && $user_id == $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 ( ( get_option( 'page_for_posts' ) == $post->ID ) || ( 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 == $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 == $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 == $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 ( ! empty( $object_subtype ) && has_filter( "auth_{$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 );
}
if ( ! empty( $object_subtype ) ) {
/**
* Filters whether the user is allowed to edit meta for specific object types/subtypes.
*
* Return true to have the mapped meta caps from `edit_{$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 {@see '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
&& ( get_option( 'default_' . $term->taxonomy ) == $term->term_id
|| 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;
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 );
}
要使用` get_users `函数获取所有用户列表，可以按照以下步骤进行：
1. 使用` get_users `函数调用获取用户列表：
$users = get_users();
2. 您可以按需使用参数来过滤结果。例如，您可以通过角色、用户ID、用户登录名等过滤用户列表。以下是一个根据用户角色为过滤条件的示例：
$users = get_users( array(
'role' => 'subscriber' // 将角色名称替换为您要过滤的角色
) );
在上述示例中，将` role `参数设置为所需的角色名称来过滤用户列表。
3. 您可以使用循环遍历获取的用户列表，并访问每个用户的属性。例如，以下示例将显示每个用户的用户名和电子邮件地址：
foreach( $users as $user ) {
echo '用户名：' . $user->user_login . ', 电子邮件：' . $user->user_email . ;
}
在上述示例中，通过` $user->user_login `和` $user->user_email `访问每个用户的用户名和电子邮件地址。
请注意，` get_users `函数默认返回所有用户，并可以根据需要使用更多参数进行过滤。您可以参阅WordPress官方文档中的` get_users `函数文档，了解更多可用参数和用法示例。
总结起来，使用` get_users `函数获取所有用户列表的步骤是：
get_users `函数获取用户列表。在WordPress中，可以使用WP_PLUGIN_DIR和WP_PLUGIN_URL常量来定义插件的目录路径和URL。
1. `WP_PLUGIN_DIR`：这是一个常量，用于定义插件的目录路径（文件系统路径）。您可以使用以下代码在插件文件中访问该常量：
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/';
在上述代码中，将"your-plugin-folder"替换为您插件的实际文件夹名称。使用该常量，您可以获取插件文件的完整路径。
2. `WP_PLUGIN_URL`：这是一个常量，用于定义插件的URL（用于在网页上访问插件文件）。以下是一个使用该常量的示例：
$plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
同样，请将"your-plugin-folder"替换为您插件的实际文件夹名称。使用该常量，您可以获取插件在网页上的完整URL。
请注意，`WP_PLUGIN_DIR`和`WP_PLUGIN_URL`常量在WordPress版本2.6之后引入。从WordPress 5.5版本开始，这两个常量被标记为过时（deprecated），因为WordPress更倾向于使用新的插件文件结构。如果您正在开发新插件，建议使用新的插件文件结构和相关函数。
在新的插件文件结构中，可以使用以下函数来获取插件的目录路径和URL：
- `plugin_dir_path()`：获取插件目录路径。
- `plugin_dir_url()`：获取插件URL。
这些函数会自动将插件的版本、多站点和SSL等考虑因素纳入计算。
总结起来，使用`WP_PLUGIN_DIR`和`WP_PLUGIN_URL`常量定义插件的目录和URL的方法是：
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/'; $plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
但请注意，这两个常量已被标记为过时，建议使用新的插件文件结构和相关函数来获取插件的路径和URL。
使用PHP在WordPress中添加自定义功能可以通过以下方式实现：
下面是一个实操示例。
要在WordPress中添加自定义功能，可以按照以下步骤使用PHP编写并添加自定义功能：
// 添加自定义功能示例
// 1. 创建自定义短代码
function custom_shortcode() {
return '这是我的自定义短代码内容';
}
add_shortcode('custom', 'custom_shortcode');
// 2. 自定义小工具
function custom_widget() {
echo '这是我的自定义小工具内容';
}
register_widget('custom_widget');
// 3. 自定义菜单
function custom_menu() {
register_nav_menu('custom-menu', '自定义菜单');
}
add_action('after_setup_theme', 'custom_menu');
// 4. 自定义页面模板
function custom_page_template() {
/* Template Name: 自定义模板 */
// 自定义模板的内容和样式
}
请注意，修改主题文件可以在主题更新时丢失，因此建议在进行任何更改之前备份functions.php文件。此外，为避免不必要的错误和冲突，建议在添加自定义功能前先了解WordPress开发文档和最佳实践，以确保正确、安全地实现所需的自定义功能。
使用 do_action 函数可以触发一个钩子函数。do_action 函数的参数与要触发的钩子函数的参数相同。
例如，触发save_post钩子函数的代码如下：
do_action( 'save_post', $post_ID, $post );
这里，$post_ID 和 $post 是传递给钩子函数的参数。
使用 wp_get_current_user 获取当前登录用户的信息：
$current_user = wp_get_current_user(); // 获取当前用户的ID $user_id = $current_user->ID; // 获取当前用户的用户名 $user_login = $current_user->user_login; // 获取当前用户的邮箱 $user_email = $current_user->user_email; // 获取当前用户的显示名称 $display_name = $current_user->display_name;
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