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unregister_default_headers() WP 3.0.0

Unregisters default headers.

This function must be called after register_default_headers() has already added the header you want to remove.

No Hooks.


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


unregister_default_headers( $header );
$header(string|array) (required)
The header string id (key of array) to remove, or an array thereof.


  • See: register_default_headers()
  • Global. Array. $_wp_default_headers


Since 3.0.0 Introduced.

Code of unregister_default_headers() WP 5.7.2

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;