- * Register CSS style file.
- *
- * @since r79
- * @see WP_Styles::add() For additional information.
- * @global object $wp_styles The WP_Styles object for printing styles.
- * @link http://www.w3.org/TR/CSS2/media.html#media-types List of CSS media types.
- *
- * @param string $handle Name of the stylesheet.
- * @param string|bool $src Path to the stylesheet from the root directory of WordPress. Example: '/css/mystyle.css'.
- * @param array $deps Array of handles of any stylesheet that this stylesheet depends on.
- * (Stylesheets that must be loaded before this stylesheet.) Pass an empty array if there are no dependencies.
- * @param string|bool $ver String specifying the stylesheet version number. Set to null to disable.
- * Used to ensure that the correct version is sent to the client regardless of caching.
- * @param string $media The media for which this stylesheet has been defined.
+ * Register a CSS stylesheet.
+ *
+ * @see WP_Dependencies::add()
+ * @link https://www.w3.org/TR/CSS2/media.html#media-types List of CSS media types.
+ *
+ * @since 2.6.0
+ * @since 4.3.0 A return value was added.
+ *
+ * @param string $handle Name of the stylesheet. Should be unique.
+ * @param string $src Full URL of the stylesheet, or path of the stylesheet relative to the WordPress root directory.
+ * @param array $deps Optional. An array of registered stylesheet handles this stylesheet depends on. Default empty array.
+ * @param string|bool|null $ver Optional. String specifying stylesheet version number, if it has one, which is added to the URL
+ * as a query string for cache busting purposes. If version is set to false, a version
+ * number is automatically added equal to current installed WordPress version.
+ * If set to null, no version is added.
+ * @param string $media Optional. The media for which this stylesheet has been defined.
+ * Default 'all'. Accepts media types like 'all', 'print' and 'screen', or media queries like
+ * '(orientation: portrait)' and '(max-width: 640px)'.
+ * @return bool Whether the style has been registered. True on success, false on failure.