Title: WP_Style_Engine_CSS_Rule::add_declarations
Published: November 2, 2022
Last modified: April 28, 2025

---

# WP_Style_Engine_CSS_Rule::add_declarations( string[]|WP_Style_Engine_CSS_Declarations $declarations ): 󠀁[WP_Style_Engine_CSS_Rule](https://developer.wordpress.org/reference/classes/wp_style_engine_css_rule/)󠁿

## In this article

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

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

Sets the declarations.

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

 `$declarations`string[]|[WP_Style_Engine_CSS_Declarations](https://developer.wordpress.org/reference/classes/wp_style_engine_css_declarations/)
required

An array of declarations (property => value pairs), or a [WP_Style_Engine_CSS_Declarations](https://developer.wordpress.org/reference/classes/wp_style_engine_css_declarations/)
object.

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

 [WP_Style_Engine_CSS_Rule](https://developer.wordpress.org/reference/classes/wp_style_engine_css_rule/)
Returns the object to allow chaining of methods.

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

    ```php
    public function add_declarations( $declarations ) {
    	$is_declarations_object = ! is_array( $declarations );
    	$declarations_array     = $is_declarations_object ? $declarations->get_declarations() : $declarations;

    	if ( null === $this->declarations ) {
    		if ( $is_declarations_object ) {
    			$this->declarations = $declarations;
    			return $this;
    		}
    		$this->declarations = new WP_Style_Engine_CSS_Declarations( $declarations_array );
    	}
    	$this->declarations->add_declarations( $declarations_array );

    	return $this;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/style-engine/class-wp-style-engine-css-rule.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/style-engine/class-wp-style-engine-css-rule.php#L89)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/style-engine/class-wp-style-engine-css-rule.php#L89-L103)

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

| Uses | Description | 
| [WP_Style_Engine_CSS_Declarations::__construct()](https://developer.wordpress.org/reference/classes/wp_style_engine_css_declarations/__construct/)`wp-includes/style-engine/class-wp-style-engine-css-declarations.php` |

Constructor for this object.

  |

| Used by | Description | 
| [WP_Style_Engine_CSS_Rule::__construct()](https://developer.wordpress.org/reference/classes/wp_style_engine_css_rule/__construct/)`wp-includes/style-engine/class-wp-style-engine-css-rule.php` |

Constructor.

  |

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

| Version | Description | 
| [6.1.0](https://developer.wordpress.org/reference/since/6.1.0/) | Introduced. |

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