ser has the given capability.
 */
function user_can( $user, $capability, ...$args ) {
	if ( ! is_object( $user ) ) {
		$user = get_userdata( $user );
	}

	if ( empty( $user ) ) {
		// User is logged out, create anonymous user object.
		$user = new WP_User( 0 );
		$user->init( new stdClass() );
	}

	return $user->has_cap( $capability, ...$args );
}

/**
 * Returns whether a particular user has the specified capability for a given site.
 *
 * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
 * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
 * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
 *
 * Example usage:
 *
 *     user_can_for_site( $user->ID, $site_id, 'edit_posts' );
 *     user_can_for_site( $user->ID, $site_id, 'edit_post', $post->ID );
 *     user_can_for_site( $user->ID, $site_id, 'edit_post_meta', $post->ID, $meta_key );
 *
 * @since 6.7.0
 *
 * @param int|WP_User $user       User ID or object.
 * @param int         $site_id    Site ID.
 * @param string      $capability Capability name.
 * @param mixed       ...$args    Optional further parameters, typically starting with an object ID.
 * @return bool Whether the user has the given capability.
 */
function user_can_for_site( $user, $site_id, $capability, ...$args ) {
	if ( ! is_object( $user ) ) {
		$user = get_userdata( $user );
	}

	if ( empty( $user ) ) {
		// User is logged out, create anonymous user object.
		$user = new WP_User( 0 );
		$user->init( new stdClass() );
	}

	// Check if the blog ID is valid.
	if ( ! is_numeric( $site_id ) || $site_id <= 0 ) {
		return false;
	}

	$switched = is_multisite() ? switch_to_blog( $site_id ) : false;

	$can = user_can( $user->ID, $capability, ...$args );

	if ( $switched ) {
		restore_current_blog();
	}

	return $can;
}

/**
 * Retrieves the global WP_Roles instance and instantiates it if necessary.
 *
 * @since 4.3.0
 *
 * @global WP_Roles $wp_roles WordPress role management object.
 *
 * @return WP_Roles WP_Roles global instance if not already instantiated.
 */
function wp_roles() {
	global $wp_roles;

	if ( ! isset( $wp_roles ) ) {
		$wp_roles = new WP_Roles();
	}
	return $wp_roles;
}

/**
 * Retrieves role object.
 *
 * @since 2.0.0
 *
 * @param string $role Role name.
 * @return WP_Role|null WP_Role object if found, null if the role does not exist.
 */
function get_role( $role ) {
	return wp_roles()->get_role( $role );
}

/**
 * Adds a role, if it does not exist.
 *
 * @since 2.0.0
 *
 * @param string $role         Role name.
 * @param string $display_name Display name for role.
 * @param bool[] $capabilities List of capabilities keyed by the capability name,
 *                             e.g. array( 'edit_posts' => true, 'delete_posts' => false ).
 * @return WP_Role|void WP_Role object, if the role is added.
 */
function add_role( $role, $display_name, $capabilities = array() ) {
	if ( empty( $role ) ) {
		return;
	}

	return wp_roles()->add_role( $role, $display_name, $capabilities );
}

/**
 * Removes a role, if it exists.
 *
 * @since 2.0.0
 *
 * @param string $role Role name.
 */
function remove_role( $role ) {
	wp_roles()->remove_role( $role );
}

/**
 * Retrieves a list of super admins.
 *
 * @since 3.0.0
 *
 * @global array $super_admins
 *
 * @return string[] List of super admin logins.
 */
function get_super_admins() {
	global $super_admins;

	if ( isset( $super_admins ) ) {
		return $super_admins;
	} else {
		return get_site_option( 'site_admins', array( 'admin' ) );
	}
}

/**
 * Determines whether user is a site admin.
 *
 * @since 3.0.0
 *
 * @param int|false $user_id Optional. The ID of a user. Defaults to false, to check the current user.
 * @return bool Whether the user is a site admin.
 */
function is_super_admin( $user_id = false ) {
	if ( ! $user_id ) {
		$user = wp_get_current_user();
	} else {
		$user = get_userdata( $user_id );
	}

	if ( ! $user || ! $user->exists() ) {
		return false;
	}

	if ( is_multisite() ) {
		$super_admins = get_super_admins();
		if ( is_array( $super_admins ) && in_array( $user->user_login, $super_admins, true ) ) {
			return true;
		}
	} elseif ( $user->has_cap( 'delete_users' ) ) {
		return true;
	}

	return false;
}

/**
 * Grants Super Admin privileges.
 *
 * @since 3.0.0
 *
 * @global array $super_admins
 *
 * @param int $user_id ID of the user to be granted Super Admin privileges.
 * @return bool True on success, false on failure. This can fail when the user is
 *              already a super admin or when the `$super_admins` global is defined.
 */
function grant_super_admin( $user_id ) {
	// If global super_admins override is defined, there is nothing to do here.
	if ( isset( $GLOBALS['super_admins'] ) || ! is_multisite() ) {
		return false;
	}

	/**
	 * Fires before the user is granted Super Admin privileges.
	 *
	 * @since 3.0.0
	 *
	 * @param int $user_id ID of the user that is about to be granted Super Admin privileges.
	 */
	do_action( 'grant_super_admin', $user_id );

	// Directly fetch site_admins instead of using get_super_admins().
	$super_admins = get_site_option( 'site_admins', array( 'admin' ) );

	$user = get_userdata( $user_id );
	if ( $user && ! in_array( $user->user_login, $super_admins, true ) ) {
		$super_admins[] = $user->user_login;
		update_site_option( 'site_admins', $super_admins );

		/**
		 * Fires after the user is granted Super Admin privileges.
		 *
		 * @since 3.0.0
		 *
		 * @param int $user_id ID of the user that was granted Super Admin privileges.
		 */
		do_action( 'granted_super_admin', $user_id );
		return true;
	}
	return false;
}

/**
 * Revokes Super Admin privileges.
 *
 * @since 3.0.0
 *
 * @global array $super_admins
 *
 * @param int $user_id ID of the user Super Admin privileges to be revoked from.
 * @return bool True on success, false on failure. This can fail when the user's email
 *              is the network admin email or when the `$super_admins` global is defined.
 */
function revoke_super_admin( $user_id ) {
	// If global super_admins override is defined, there is nothing to do here.
	if ( isset( $GLOBALS['super_admins'] ) || ! is_multisite() ) {
		return false;
	}

	/**
	 * Fires before the user's Super Admin privileges are revoked.
	 *
	 * @since 3.0.0
	 *
	 * @param int $user_id ID of the user Super Admin privileges are being revoked from.
	 */
	do_action( 'revoke_super_admin', $user_id );

	// Directly fetch site_admins instead of using get_super_admins().
	$super_admins = get_site_option( 'site_admins', array( 'admin' ) );

	$user = get_userdata( $user_id );
	if ( $user && 0 !== strcasecmp( $user->user_email, get_site_option( 'admin_email' ) ) ) {
		$key = array_search( $user->user_login, $super_admins, true );
		if ( false !== $key ) {
			unset( $super_admins[ $key ] );
			update_site_option( 'site_admins', $super_admins );

			/**
			 * Fires after the user's Super Admin privileges are revoked.
			 *
			 * @since 3.0.0
			 *
			 * @param int $user_id ID of the user Super Admin privileges were revoked from.
			 */
			do_action( 'revoked_super_admin', $user_id );
			return true;
		}
	}
	return false;
}

/**
 * Filters the user capabilities to grant the 'install_languages' capability as necessary.
 *
 * A user must have at least one out of the 'update_core', 'install_plugins', and
 * 'install_themes' capabilities to qualify for 'install_languages'.
 *
 * @since 4.9.0
 *
 * @param bool[] $allcaps An array of all the user's capabilities.
 * @return bool[] Filtered array of the user's capabilities.
 */
function wp_maybe_grant_install_languages_cap( $allcaps ) {
	if ( ! empty( $allcaps['update_core'] ) || ! empty( $allcaps['install_plugins'] ) || ! empty( $allcaps['install_themes'] ) ) {
		$allcaps['install_languages'] = true;
	}

	return $allcaps;
}

/**
 * Filters the user capabilities to grant the 'resume_plugins' and 'resume_themes' capabilities as necessary.
 *
 * @since 5.2.0
 *
 * @param bool[] $allcaps An array of all the user's capabilities.
 * @return bool[] Filtered array of the user's capabilities.
 */
function wp_maybe_grant_resume_extensions_caps( $allcaps ) {
	// Even in a multisite, regular administrators should be able to resume plugins.
	if ( ! empty( $allcaps['activate_plugins'] ) ) {
		$allcaps['resume_plugins'] = true;
	}

	// Even in a multisite, regular administrators should be able to resume themes.
	if ( ! empty( $allcaps['switch_themes'] ) ) {
		$allcaps['resume_themes'] = true;
	}

	return $allcaps;
}

/**
 * Filters the user capabilities to grant the 'view_site_health_checks' capabilities as necessary.
 *
 * @since 5.2.2
 *
 * @param bool[]   $allcaps An array of all the user's capabilities.
 * @param string[] $caps    Required primitive capabilities for the requested capability.
 * @param array    $args {
 *     Arguments that accompany the requested capability check.
 *
 *     @type string    $0 Requested capability.
 *     @type int       $1 Concerned user ID.
 *     @type mixed  ...$2 Optional second and further parameters, typically object ID.
 * }
 * @param WP_User  $user    The user object.
 * @return bool[] Filtered array of the user's capabilities.
 */
function wp_maybe_grant_site_health_caps( $allcaps, $caps, $args, $user ) {
	if ( ! empty( $allcaps['install_plugins'] ) && ( ! is_multisite() || is_super_admin( $user->ID ) ) ) {
		$allcaps['view_site_health_checks'] = true;
	}

	return $allcaps;
}

return;

// Dummy gettext calls to get strings in the catalog.
/* translators: User role for administrators. */
_x( 'Administrator', 'User role' );
/* translators: User role for editors. */
_x( 'Editor', 'User role' );
/* translators: User role for authors. */
_x( 'Author', 'User role' );
/* translators: User role for contributors. */
_x( 'Contributor', 'User role' );
/* translators: User role for subscribers. */
_x( 'Subscriber', 'User role' );