diff --git a/lib/experimental/class-wp-webfonts.php b/lib/experimental/class-wp-webfonts.php
index 8ebbb027176b5..d4a73c77cc2d2 100644
--- a/lib/experimental/class-wp-webfonts.php
+++ b/lib/experimental/class-wp-webfonts.php
@@ -120,7 +120,7 @@ public function get_providers() {
 	 *
 	 * @since 6.0.0
 	 *
-	 * @param array $webfont The font argument.
+	 * @param array $webfont Webfont to be registered.
 	 * @return bool True if successfully registered, else false.
 	 */
 	public function register_webfont( array $webfont ) {
diff --git a/lib/experimental/register-webfonts-from-theme-json.php b/lib/experimental/register-webfonts-from-theme-json.php
index 68d38a9042bff..3282a9eaebbc0 100644
--- a/lib/experimental/register-webfonts-from-theme-json.php
+++ b/lib/experimental/register-webfonts-from-theme-json.php
@@ -42,7 +42,7 @@ function gutenberg_register_webfonts_from_theme_json() {
 
 					foreach ( $font_face['src'] as $src_key => $url ) {
 						// Tweak the URL to be relative to the theme root.
-						if ( 0 !== strpos( $url, 'file:./' ) ) {
+						if ( ! str_starts_with( $url, 'file:./' ) ) {
 							continue;
 						}
 						$font_face['src'][ $src_key ] = get_theme_file_uri( str_replace( 'file:./', '', $url ) );
@@ -71,7 +71,6 @@ function gutenberg_register_webfonts_from_theme_json() {
  * Add missing fonts data to the global styles.
  *
  * @param array $data The global styles.
- *
  * @return array The global styles with missing fonts data.
  */
 function gutenberg_add_registered_webfonts_to_theme_json( $data ) {
@@ -85,10 +84,9 @@ function gutenberg_add_registered_webfonts_to_theme_json( $data ) {
 	 * Helper to get an array of the font-families.
 	 *
 	 * @param array $families_data The font-families data.
-	 *
 	 * @return array The font-families array.
 	 */
-	$get_families = function( $families_data ) {
+	$get_families = static function( $families_data ) {
 		$families = array();
 		foreach ( $families_data as $family ) {
 			$families[] = WP_Webfonts::get_font_slug( $family );
@@ -137,7 +135,7 @@ function gutenberg_add_registered_webfonts_to_theme_json( $data ) {
 		}
 
 		$data['settings']['typography']['fontFamilies'][] = array(
-			'fontFamily' => false !== strpos( $family_name, ' ' ) ? "'{$family_name}'" : $family_name,
+			'fontFamily' => str_contains( $family_name, ' ' ) ? "'{$family_name}'" : $family_name,
 			'name'       => $family_name,
 			'slug'       => $slug,
 			'fontFace'   => $font_faces,
diff --git a/lib/experimental/webfonts.php b/lib/experimental/webfonts.php
index 8d4fb91534e0c..6d4c5f8dcc12b 100644
--- a/lib/experimental/webfonts.php
+++ b/lib/experimental/webfonts.php
@@ -60,11 +60,11 @@ function wp_webfonts() {
 	 *
 	 * @since 6.0.0
 	 *
-	 * @param array $webfonts Webfonts to be registered.
+	 * @param array[] $webfonts Webfonts to be registered.
 	 *                        This contains an array of webfonts to be registered.
 	 *                        Each webfont is an array.
 	 */
-	function wp_register_webfonts( array $webfonts = array() ) {
+	function wp_register_webfonts( array $webfonts ) {
 		foreach ( $webfonts as $webfont ) {
 			wp_register_webfont( $webfont );
 		}
@@ -94,9 +94,10 @@ function wp_register_webfonts( array $webfonts = array() ) {
 	 * @since 6.0.0
 	 *
 	 * @param array $webfont Webfont to be registered.
+	 * @return bool True if successfully registered, else false.
 	 */
 	function wp_register_webfont( array $webfont ) {
-		wp_webfonts()->register_webfont( $webfont );
+		return wp_webfonts()->register_webfont( $webfont );
 	}
 }
 
@@ -119,7 +120,7 @@ function wp_register_webfont( array $webfont ) {
 	 *
 	 * @param string[] $webfonts Font families to be enqueued.
 	 */
-	function wp_enqueue_webfonts( $webfonts ) {
+	function wp_enqueue_webfonts( array $webfonts ) {
 		foreach ( $webfonts as $webfont ) {
 			wp_enqueue_webfont( $webfont );
 		}
@@ -140,10 +141,11 @@ function wp_enqueue_webfonts( $webfonts ) {
 	 *
 	 * @since 6.0.0
 	 *
-	 * @param string $webfont Font family to be enqueued.
+	 * @param string $font_family_name The font family name to be enqueued.
+	 * @return bool True if successfully enqueued, else false.
 	 */
-	function wp_enqueue_webfont( $webfont ) {
-		wp_webfonts()->enqueue_webfont( $webfont );
+	function wp_enqueue_webfont( $font_family_name ) {
+		return wp_webfonts()->enqueue_webfont( $font_family_name );
 	}
 }
 
diff --git a/phpunit/class-wp-webfonts-test.php b/phpunit/class-wp-webfonts-test.php
index 1ab14f6cd4f3b..4292747f475b2 100644
--- a/phpunit/class-wp-webfonts-test.php
+++ b/phpunit/class-wp-webfonts-test.php
@@ -367,7 +367,7 @@ public function test_validate_webfont() {
 	 *
 	 * @covers WP_Webfonts::generate_and_enqueue_styles
 	 */
-	public function test_generate_styles() {
+	public function test_generate_and_enqueue_styles() {
 		wp_register_webfonts(
 			array(
 				array(