wordpress custom redirection

function va_redirect_to_front_page() {
    if (isset($_GET['redirect_to'])) {
if($_GET['redirect_to']=="crer-annonce-2")
         wp_redirect( 'crer-annonce-2' );
else
wp_redirect( $_GET['redirect_to'] );
        exit();
    }
else
wp_redirect( 'dashboard' );
exit();
}

creat this funciton in theme/includes/core
don't forget to add action