Title: WP_Theme_JSON::get_block_classes
Published: February 3, 2022
Last modified: February 24, 2026

---

# WP_Theme_JSON::get_block_classes( array $style_nodes ): string

## In this article

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

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

Converts each style section into a list of rulesets containing the block styles 
to be appended to the stylesheet.

## 󠀁[Description](https://developer.wordpress.org/reference/classes/wp_theme_json/get_block_classes/?output_format=md#description)󠁿

See glossary at [https://developer.mozilla.org/en-US/docs/Web/CSS/Syntax](https://developer.mozilla.org/en-US/docs/Web/CSS/Syntax)

For each section this creates a new ruleset such as:

block-selector { style-property-one: value; }

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

 `$style_nodes`arrayrequired

Nodes with styles.

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

 string The new stylesheet.

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

    ```php
    protected function get_block_classes( $style_nodes ) {
    	$block_rules = '';

    	foreach ( $style_nodes as $metadata ) {
    		if ( null === $metadata['selector'] ) {
    			continue;
    		}
    		$block_rules .= static::get_styles_for_block( $metadata );
    	}

    	return $block_rules;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp-theme-json.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/class-wp-theme-json.php#L1610)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-theme-json.php#L1610-L1621)

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

| Used by | Description | 
| [WP_Theme_JSON::get_stylesheet()](https://developer.wordpress.org/reference/classes/wp_theme_json/get_stylesheet/)`wp-includes/class-wp-theme-json.php` |

Returns the stylesheet that results of processing the theme.json structure this object represents.

  |

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

| Version | Description | 
| [6.1.0](https://developer.wordpress.org/reference/since/6.1.0/) | Moved most internal logic to `get_styles_for_block()`. | 
| [5.9.0](https://developer.wordpress.org/reference/since/5.9.0/) | Renamed from `get_block_styles()` to `get_block_classes()` and no longer returns preset classes.
 Removed the `$setting_nodes` parameter. | 
| [5.8.0](https://developer.wordpress.org/reference/since/5.8.0/) | Introduced. |

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