WordPress at a glance
function is not described

_remove_qs_args_if_not_in_url() WP 3.4.0

Removes arguments from a query string if they are not present in a URL DO NOT use this in plugin code.

No Hooks.

Return

String. The altered query string

Usage

_remove_qs_args_if_not_in_url( $query_string, $args_to_check, $url );
$query_string(string) (required)
$args_to_check(array) (required)
$url(string) (required)

Code of remove qs args if not in url: wp-includes/canonical.php VER 5.1.1

<?php
function _remove_qs_args_if_not_in_url( $query_string, array $args_to_check, $url ) {
	$parsed_url = @parse_url( $url );
	if ( ! empty( $parsed_url['query'] ) ) {
		parse_str( $parsed_url['query'], $parsed_query );
		foreach ( $args_to_check as $qv ) {
			if ( ! isset( $parsed_query[ $qv ] ) ) {
				$query_string = remove_query_arg( $qv, $query_string );
			}
		}
	} else {
		$query_string = remove_query_arg( $args_to_check, $query_string );
	}
	return $query_string;
}