WP_Block_Supports::apply_block_supports() WordPress Method

	public function apply_block_supports() {
		$block_attributes = self::$block_to_render['attrs'];
		$block_type       = WP_Block_Type_Registry::get_instance()->get_registered(
			self::$block_to_render['blockName']
		);

		// If no render_callback, assume styles have been previously handled.
		if ( ! $block_type || empty( $block_type ) ) {
			return array();
		}

		$output = array();
		foreach ( $this->block_supports as $block_support_config ) {
			if ( ! isset( $block_support_config['apply'] ) ) {
				continue;
			}

			$new_attributes = call_user_func(
				$block_support_config['apply'],
				$block_type,
				$block_attributes
			);

			if ( ! empty( $new_attributes ) ) {
				foreach ( $new_attributes as $attribute_name => $attribute_value ) {
					if ( empty( $output[ $attribute_name ] ) ) {
						$output[ $attribute_name ] = $attribute_value;
					} else {
						$output[ $attribute_name ] .= " $attribute_value";
					}
				}
			}
		}

		return $output;
	}