attributes. Default empty array.
	 * @param string $content    Optional. Block content. Default empty string.
	 * @return string Rendered block type output.
	 */
	public function render( $attributes = array(), $content = '' ) {
		if ( ! $this->is_dynamic() ) {
			return '';
		}

		$attributes = $this->prepare_attributes_for_render( $attributes );

		return (string) call_user_func( $this->render_callback, $attributes, $content );
	}

	/**
	 * Returns true if the block type is dynamic, or false otherwise. A dynamic
	 * block is one which defers its rendering to occur on-demand at runtime.
	 *
	 * @since 5.0.0
	 *
	 * @return bool Whether block type is dynamic.
	 */
	public function is_dynamic() {
		return is_callable( $this->render_callback );
	}

	/**
	 * Validates attributes against the current block schema, populating
	 * defaulted and missing values.
	 *
	 * @since 5.0.0
	 *
	 * @param array $attributes Original block attributes.
	 * @return array Prepared block attributes.
	 */
	public function prepare_attributes_for_render( $attributes ) {
		// If there are no attribute definitions for the block type, skip
		// processing and return verbatim.
		if ( ! isset( $this->attributes ) ) {
			return $attributes;
		}

		foreach ( $attributes as $attribute_name => $value ) {
			// If the attribute is not defined by the block type, it cannot be
			// validated.
			if ( ! isset( $this->attributes[ $attribute_name ] ) ) {
				continue;
			}

			$schema = $this->attributes[ $attribute_name ];

			// Validate value by JSON schema. An invalid value should revert to
			// its default, if one exists. This occurs by virtue of the missing
			// attributes loop immediately following. If there is not a default
			// assigned, the attribute value should remain unset.
			$is_valid = rest_validate_value_from_schema( $value, $schema, $attribute_name );
			if ( is_wp_error( $is_valid ) ) {
				unset( $attributes[ $attribute_name ] );
			}
		}

		// Populate values of any missing attributes for which the block type
		// defines a default.
		$missing_schema_attributes = array_diff_key( $this->attributes, $attributes );
		foreach ( $missing_schema_attributes as $attribute_name => $schema ) {
			if ( isset( $schema['default'] ) ) {
				$attributes[ $attribute_name ] = $schema['default'];
			}
		}

		return $attributes;
	}

	/**
	 * Sets block type properties.
	 *
	 * @since 5.0.0
	 *
	 * @param array|string $args Array or string of arguments for registering a block type.
	 *                           See WP_Block_Type::__construct() for information on accepted arguments.
	 */
	public function set_props( $args ) {
		$args = wp_parse_args(
			$args,
			array(
				'render_callback' => null,
			)
		);

		$args['name'] = $this->name;

		// Setup attributes if needed.
		if ( ! isset( $args['attributes'] ) || ! is_array( $args['attributes'] ) ) {
			$args['attributes'] = array();
		}

		// Register core attributes.
		foreach ( static::GLOBAL_ATTRIBUTES as $attr_key => $attr_schema ) {
			if ( ! array_key_exists( $attr_key, $args['attributes'] ) ) {
				$args['attributes'][ $attr_key ] = $attr_schema;
			}
		}

		/**
		 * Filters the arguments for registering a block type.
		 *
		 * @since 5.5.0
		 *
		 * @param array  $args       Array of arguments for registering a block type.
		 * @param string $block_type Block type name including namespace.
		 */
		$args = apply_filters( 'register_block_type_args', $args, $this->name );

		foreach ( $args as $property_name => $property_value ) {
			$this->$property_name = $property_value;
		}
	}

	/**
	 * Get all available block attributes including possible layout attribute from Columns block.
	 *
	 * @since 5.0.0
	 *
	 * @return array Array of attributes.
	 */
	public function get_attributes() {
		return is_array( $this->attributes ) ?
			$this->attributes :
			array();
	}

	/**
	 * Get block variations.
	 *
	 * @since 6.5.0
	 *
	 * @return array[]
	 */
	public function get_variations() {
		if ( ! isset( $this->variations ) ) {
			$this->variations = array();
			if ( is_callable( $this->variation_callback ) ) {
				$this->variations = call_user_func( $this->variation_callback );
			}
		}

		/**
		 * Filters the registered variations for a block type.
		 *
		 * @since 6.5.0
		 *
		 * @param array         $variations Array of registered variations for a block type.
		 * @param WP_Block_Type $block_type The full block type object.
		 */
		return apply_filters( 'get_block_type_variations', $this->variations, $this );
	}

	/**
	 * Get block uses context.
	 *
	 * @since 6.5.0
	 *
	 * @return string[]
	 */
	public function get_uses_context() {
		/**
		 * Filters the registered uses context for a block type.
		 *
		 * @since 6.5.0
		 *
		 * @param string[]      $uses_context Array of registered uses context for a block type.
		 * @param WP_Block_Type $block_type   The full block type object.
		 */
		return apply_filters( 'get_block_type_uses_context', $this->uses_context, $this );
	}
}
<br />
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