Title: WP::set_query_var
Published: April 25, 2014
Last modified: May 20, 2026

---

# WP::set_query_var( string $key, mixed $value )

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wp/set_query_var/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/classes/wp/set_query_var/?output_format=md#source)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp/set_query_var/?output_format=md#changelog)

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

Sets the value of a query variable.

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

 `$key`stringrequired

Query variable name.

`$value`mixedrequired

Query variable value.

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

    ```php
    public function set_query_var( $key, $value ) {
    	$this->query_vars[ $key ] = $value;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/class-wp.php#L118)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/class-wp.php#L118-L120)

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

| Version | Description | 
| [2.3.0](https://developer.wordpress.org/reference/since/2.3.0/) | Introduced. |

## User Contributed Notes

You must [log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fclasses%2Fwp%2Fset_query_var%2F)
before being able to contribute a note or feedback.