get_block_wrapper_attributes()

get_block_wrapper_attributes( string[] $extra_attributes = array() ): string

function get_block_wrapper_attributes( $extra_attributes = array() ) {
	$new_attributes = WP_Block_Supports::get_instance()->apply_block_supports();

	if ( empty( $new_attributes ) && empty( $extra_attributes ) ) {
		return '';
	}

	// Attribute values are concatenated or overridden depending on the attribute type.
	// This is hardcoded on purpose, as we only support a fixed list of attributes.
	$attribute_merge_callbacks = array(
		'style'      => static function ( $new_attribute, $extra_attribute ) {
			$styles = array_filter(
				array(
					rtrim( trim( $new_attribute ), ';' ),
					rtrim( trim( $extra_attribute ), ';' ),
				)
			);
			return safecss_filter_attr( implode( ';', array_filter( $styles ) ) );
		},
		'class'      => static function ( $new_attribute, $extra_attribute ) {
			$classes = array_merge(
				(array) preg_split( '/\s+/', $extra_attribute, -1, PREG_SPLIT_NO_EMPTY ),
				(array) preg_split( '/\s+/', $new_attribute, -1, PREG_SPLIT_NO_EMPTY )
			);
			$classes = array_unique( array_filter( $classes ) );
			return implode( ' ', $classes );
		},
		'id'         => static function ( $new_attribute, $extra_attribute ) {
			return '' !== $extra_attribute ? $extra_attribute : $new_attribute;
		},
		'aria-label' => static function ( $new_attribute, $extra_attribute ) {
			return '' !== $extra_attribute ? $extra_attribute : $new_attribute;
		},
	);

	$attributes = array();
	foreach ( $attribute_merge_callbacks as $attribute_name => $merge_callback ) {
		$new_attribute   = $new_attributes[ $attribute_name ] ?? '';
		$extra_attribute = $extra_attributes[ $attribute_name ] ?? '';
		$new_attribute   = is_string( $new_attribute ) ? $new_attribute : '';
		$extra_attribute = is_string( $extra_attribute ) ? $extra_attribute : '';

		if ( '' === $new_attribute && '' === $extra_attribute ) {
			continue;
		}

		$attributes[ $attribute_name ] = $merge_callback( $new_attribute, $extra_attribute );
	}

	foreach ( $extra_attributes as $attribute_name => $value ) {
		if ( ! isset( $attribute_merge_callbacks[ $attribute_name ] ) ) {
			$attributes[ $attribute_name ] = $value;
		}
	}

	if ( empty( $attributes ) ) {
		return '';
	}

	$normalized_attributes = array();
	foreach ( $attributes as $key => $value ) {
		$normalized_attributes[] = $key . '="' . esc_attr( $value ) . '"';
	}

	return implode( ' ', $normalized_attributes );
}