+ * Add extra CSS styles to a registered stylesheet.
+ *
+ * Styles will only be added if the stylesheet in already in the queue.
+ * Accepts a string $data containing the CSS. If two or more CSS code blocks
+ * are added to the same stylesheet $handle, they will be printed in the order
+ * they were added, i.e. the latter added styles can redeclare the previous.
+ *
+ * @see WP_Styles::add_inline_style()
+ *
+ * @since 3.3.0
+ *
+ * @param string $handle Name of the stylesheet to add the extra styles to.
+ * @param string $data String containing the CSS styles to be added.
+ * @return bool True on success, false on failure.
+ */
+function wp_add_inline_style( $handle, $data ) {
+ _wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );
+
+ if ( false !== stripos( $data, '</style>' ) ) {
+ _doing_it_wrong( __FUNCTION__, sprintf(
+ /* translators: 1: <style>, 2: wp_add_inline_style() */
+ __( 'Do not pass %1$s tags to %2$s.' ),
+ '<code><style></code>',
+ '<code>wp_add_inline_style()</code>'
+ ), '3.7.0' );
+ $data = trim( preg_replace( '#<style[^>]*>(.*)</style>#is', '$1', $data ) );
+ }
+
+ return wp_styles()->add_inline_style( $handle, $data );
+}
+
+/**
+ * Register a CSS stylesheet.
+ *
+ * @see WP_Dependencies::add()
+ * @link https://www.w3.org/TR/CSS2/media.html#media-types List of CSS media types.