WordPress at a glance
function is not described

wp_admin_canonical_url() WP 4.2.0

Remove single-use URL parameters and create canonical link based on new URL.

Remove specific query string parameters from a URL, create the canonical link, put it in the admin header, and change the current URL to match.

No Hooks.

Return

Nothing (null).

Usage

wp_admin_canonical_url();

Code of wp admin canonical url: wp-admin/includes/misc.php VER 5.0.3

<?php
function wp_admin_canonical_url() {
	$removable_query_args = wp_removable_query_args();

	if ( empty( $removable_query_args ) ) {
		return;
	}

	// Ensure we're using an absolute URL.
	$current_url  = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
	$filtered_url = remove_query_arg( $removable_query_args, $current_url );
	?>
	<link id="wp-admin-canonical" rel="canonical" href="<?php echo esc_url( $filtered_url ); ?>" />
	<script>
		if ( window.history.replaceState ) {
			window.history.replaceState( null, null, document.getElementById( 'wp-admin-canonical' ).href + window.location.hash );
		}
	</script>
<?php
}