Title: WP_REST_Block_Renderer_Controller::get_item
Published: December 6, 2018
Last modified: February 24, 2026

---

# WP_REST_Block_Renderer_Controller::get_item( WP_REST_Request $request ): 󠀁[WP_REST_Response](https://developer.wordpress.org/reference/classes/wp_rest_response/)󠁿|󠀁[WP_Error](https://developer.wordpress.org/reference/classes/wp_error/)󠁿

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#wp--skip-link--target)

Returns block output from block’s registered render_callback.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#parameters)󠁿

 `$request`[WP_REST_Request](https://developer.wordpress.org/reference/classes/wp_rest_request/)
required

Full details about the request.

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#return)󠁿

 [WP_REST_Response](https://developer.wordpress.org/reference/classes/wp_rest_response/)
|[WP_Error](https://developer.wordpress.org/reference/classes/wp_error/) Response
object on success, or [WP_Error](https://developer.wordpress.org/reference/classes/wp_error/)
object on failure.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#source)󠁿

    ```php
    public function get_item( $request ) {
    	global $post;

    	$post_id = isset( $request['post_id'] ) ? (int) $request['post_id'] : 0;

    	if ( $post_id > 0 ) {
    		$post = get_post( $post_id );

    		// Set up postdata since this will be needed if post_id was set.
    		setup_postdata( $post );
    	}

    	$registry   = WP_Block_Type_Registry::get_instance();
    	$registered = $registry->get_registered( $request['name'] );

    	if ( null === $registered || ! $registered->is_dynamic() ) {
    		return new WP_Error(
    			'block_invalid',
    			__( 'Invalid block.' ),
    			array(
    				'status' => 404,
    			)
    		);
    	}

    	$attributes = $request->get_param( 'attributes' );

    	// Create an array representation simulating the output of parse_blocks.
    	$block = array(
    		'blockName'    => $request['name'],
    		'attrs'        => $attributes,
    		'innerHTML'    => '',
    		'innerContent' => array(),
    	);

    	// Render using render_block to ensure all relevant filters are used.
    	$data = array(
    		'rendered' => render_block( $block ),
    	);

    	return rest_ensure_response( $data );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php#L153)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php#L153-L194)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#related)󠁿

| Uses | Description | 
| [WP_Block_Type_Registry::get_instance()](https://developer.wordpress.org/reference/classes/wp_block_type_registry/get_instance/)`wp-includes/class-wp-block-type-registry.php` |

Utility method to retrieve the main instance of the class.

  | 
| [render_block()](https://developer.wordpress.org/reference/functions/render_block/)`wp-includes/blocks.php` |

Renders a single block into a HTML string.

  | 
| [setup_postdata()](https://developer.wordpress.org/reference/functions/setup_postdata/)`wp-includes/query.php` |

Set up global post data.

  | 
| [rest_ensure_response()](https://developer.wordpress.org/reference/functions/rest_ensure_response/)`wp-includes/rest-api.php` |

Ensures a REST response is a response object (for consistency).

  | 
| [__()](https://developer.wordpress.org/reference/functions/__/)`wp-includes/l10n.php` |

Retrieves the translation of $text.

  | 
| [get_post()](https://developer.wordpress.org/reference/functions/get_post/)`wp-includes/post.php` |

Retrieves post data given a post ID or post object.

  | 
| [WP_Error::__construct()](https://developer.wordpress.org/reference/classes/wp_error/__construct/)`wp-includes/class-wp-error.php` |

Initializes the error.

  |

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## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_rest_block_renderer_controller/get_item/?output_format=md#changelog)󠁿

| Version | Description | 
| [5.0.0](https://developer.wordpress.org/reference/since/5.0.0/) | Introduced. |

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