_wp_multiple_block_styles() │ WP 5.9.0

Allows multiple block styles.

This is an internal function for using it by WP core itself. It's not recommended to use this function in your code.

No Hooks.

Return

Array. Metadata for registering a block type.

Usage

_wp_multiple_block_styles( $metadata );
$metadata(array) (required)
Metadata for registering a block type.

Changelog

Since 5.9.0 Introduced.

Code of _wp_multiple_block_styles() WP 6.0

wp-includes/blocks.php 
function _wp_multiple_block_styles( $metadata ) {
	foreach ( array( 'style', 'editorStyle' ) as $key ) {
		if ( ! empty( $metadata[ $key ] ) && is_array( $metadata[ $key ] ) ) {
			$default_style = array_shift( $metadata[ $key ] );
			foreach ( $metadata[ $key ] as $handle ) {
				$args = array( 'handle' => $handle );
				if ( 0 === strpos( $handle, 'file:' ) && isset( $metadata['file'] ) ) {
					$style_path      = remove_block_asset_path_prefix( $handle );
					$theme_path_norm = wp_normalize_path( get_theme_file_path() );
					$style_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $style_path ) );
					$is_theme_block  = isset( $metadata['file'] ) && 0 === strpos( $metadata['file'], $theme_path_norm );

					$style_uri = plugins_url( $style_path, $metadata['file'] );

					if ( $is_theme_block ) {
						$style_uri = get_theme_file_uri( str_replace( $theme_path_norm, '', $style_path_norm ) );
					}

					$args = array(
						'handle' => sanitize_key( "{$metadata['name']}-{$style_path}" ),
						'src'    => $style_uri,
					);
				}

				wp_enqueue_block_style( $metadata['name'], $args );
			}

			// Only return the 1st item in the array.
			$metadata[ $key ] = $default_style;
		}
	}
	return $metadata;
}