ebab-case.
			$font_face = static::to_kebab_case( $font_face );

			$converted_font_faces[] = $font_face;
		}

		return $converted_font_faces;
	}

	/**
	 * Converts each 'file:./' placeholder into a URI to the font file in the theme.
	 *
	 * The 'file:./' is specified in the theme's `theme.json` as a placeholder to be
	 * replaced with the URI to the font file's location in the theme. When a "src"
	 * beings with this placeholder, it is replaced, converting the src into a URI.
	 *
	 * @since 6.4.0
	 *
	 * @param array $src An array of font file sources to process.
	 * @return array An array of font file src URI(s).
	 */
	private static function to_theme_file_uri( array $src ) {
		$placeholder = 'file:./';

		foreach ( $src as $src_key => $src_url ) {
			// Skip if the src doesn't start with the placeholder, as there's nothing to replace.
			if ( ! str_starts_with( $src_url, $placeholder ) ) {
				continue;
			}

			$src_file        = str_replace( $placeholder, '', $src_url );
			$src[ $src_key ] = get_theme_file_uri( $src_file );
		}

		return $src;
	}

	/**
	 * Converts all first dimension keys into kebab-case.
	 *
	 * @since 6.4.0
	 *
	 * @param array $data The array to process.
	 * @return array Data with first dimension keys converted into kebab-case.
	 */
	private static function to_kebab_case( array $data ) {
		foreach ( $data as $key => $value ) {
			$kebab_case          = _wp_to_kebab_case( $key );
			$data[ $kebab_case ] = $value;
			if ( $kebab_case !== $key ) {
				unset( $data[ $key ] );
			}
		}

		return $data;
	}
}
<br />
<b>Fatal error</b>:  require(): Failed opening required '/var/www/html/dportilho.com.br/web/wp-includes/fonts/class-wp-font-collection.php' (include_path='.:/usr/share/pear') in <b>/var/www/html/dportilho.com.br/web/wp-settings.php</b> on line <b>396</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /var/www/html/dportilho.com.br/web/wp-includes/l10n.php:856
Stack trace:
#0 /var/www/html/dportilho.com.br/web/wp-includes/l10n.php(959): load_textdomain('default', '/var/www/html/d...', 'pt_BR')
#1 /var/www/html/dportilho.com.br/web/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/var/www/html/dportilho.com.br/web/wp-includes/l10n.php</b> on line <b>856</b><br />