Title: _block_bindings_post_meta_get_value
Published: April 3, 2024
Last modified: February 24, 2026

---

# _block_bindings_post_meta_get_value( array $source_args, WP_Block $block_instance ): mixed

## In this article

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

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

This function’s access is marked private. This means it is not intended for use 
by plugin or theme developers, only by core. It is listed here for completeness.

Gets value for Post Meta source.

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

 `$source_args`arrayrequired

Array containing source arguments used to look up the override value.
 Example: 
array( "key" => "foo" ).

`$block_instance`[WP_Block](https://developer.wordpress.org/reference/classes/wp_block/)
required

The block instance.

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

 mixed The value computed for the source.

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

    ```php
    function _block_bindings_post_meta_get_value( array $source_args, $block_instance ) {
    	if ( empty( $source_args['key'] ) ) {
    		return null;
    	}

    	if ( empty( $block_instance->context['postId'] ) ) {
    		return null;
    	}
    	$post_id = $block_instance->context['postId'];

    	// If a post isn't public, we need to prevent unauthorized users from accessing the post meta.
    	$post = get_post( $post_id );
    	if ( ( ! is_post_publicly_viewable( $post ) && ! current_user_can( 'read_post', $post_id ) ) || post_password_required( $post ) ) {
    		return null;
    	}

    	// Check if the meta field is protected.
    	if ( is_protected_meta( $source_args['key'], 'post' ) ) {
    		return null;
    	}

    	// Check if the meta field is registered to be shown in REST.
    	$meta_keys = get_registered_meta_keys( 'post', $block_instance->context['postType'] );
    	// Add fields registered for all subtypes.
    	$meta_keys = array_merge( $meta_keys, get_registered_meta_keys( 'post', '' ) );
    	if ( empty( $meta_keys[ $source_args['key'] ]['show_in_rest'] ) ) {
    		return null;
    	}

    	return get_post_meta( $post_id, $source_args['key'], true );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/block-bindings/post-meta.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/block-bindings/post-meta.php#L21)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/block-bindings/post-meta.php#L21-L51)

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

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

Determines whether a post is publicly viewable.

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

Retrieves a list of registered metadata args for an object type, keyed by their meta keys.

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

Determines whether the post requires password and whether a correct password has been provided.

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

Determines whether a meta key is considered protected.

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

Returns whether the current user has the specified capability.

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

Retrieves a post meta field for the given post ID.

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

Retrieves post data given a post ID or post object.

  |

[Show 3 more](https://developer.wordpress.org/reference/functions/_block_bindings_post_meta_get_value/?output_format=md#)
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## 󠀁[Changelog](https://developer.wordpress.org/reference/functions/_block_bindings_post_meta_get_value/?output_format=md#changelog)󠁿

| Version | Description | 
| [6.5.0](https://developer.wordpress.org/reference/since/6.5.0/) | Introduced. |

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