Title: unregister_default_headers
Published: April 25, 2014
Last modified: February 24, 2026

---

# unregister_default_headers( string|array $header ): bool|void

## In this article

 * [Description](https://developer.wordpress.org/reference/functions/unregister_default_headers/?output_format=md#description)
    - [See also](https://developer.wordpress.org/reference/functions/unregister_default_headers/?output_format=md#see-also)
 * [Parameters](https://developer.wordpress.org/reference/functions/unregister_default_headers/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/functions/unregister_default_headers/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/functions/unregister_default_headers/?output_format=md#source)
 * [Changelog](https://developer.wordpress.org/reference/functions/unregister_default_headers/?output_format=md#changelog)

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

Unregisters default headers.

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

This function must be called after [register_default_headers()](https://developer.wordpress.org/reference/functions/register_default_headers/)
has already added the header you want to remove.

### 󠀁[See also](https://developer.wordpress.org/reference/functions/unregister_default_headers/?output_format=md#see-also)󠁿

 * [register_default_headers()](https://developer.wordpress.org/reference/functions/register_default_headers/)

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

 `$header`string|arrayrequired

The header string id (key of array) to remove, or an array thereof.

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

 bool|void A single header returns true on success, false on failure.
 There is 
currently no return value for multiple headers.

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

    ```php
    function unregister_default_headers( $header ) {
    	global $_wp_default_headers;

    	if ( is_array( $header ) ) {
    		array_map( 'unregister_default_headers', $header );
    	} elseif ( isset( $_wp_default_headers[ $header ] ) ) {
    		unset( $_wp_default_headers[ $header ] );
    		return true;
    	} else {
    		return false;
    	}
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/theme.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/theme.php#L1634)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/theme.php#L1634-L1645)

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

| Version | Description | 
| [3.0.0](https://developer.wordpress.org/reference/since/3.0.0/) | Introduced. |

## User Contributed Notes

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