How to place a php code inside a scrip in a .php file?

I have an MVC project and in my controller file I have a case that evaluates the action I execute, in the delete action I want to place a SweerAlert alert that contains an ok and a cancel that when the ok button is deleted , before using sweerAlert it was normal but without asking, now that I put it in it, it gives me a declaration error of variable id in $ worker-> deleteById ($ id), I will put the piece of code to help me please.

  case "eliminar":
    {


        $alert ='<script>swal({
        title: "¿Estás seguro?",
        text: "Estás por borrar un registro, este no se podrá recuperar más adelante.",
        type: "warning",
        showCancelButton: true,
        cancelButtonText: "Cancelar",
            confirmButtonColor: "#DD6B55",
            confirmButtonText: "Continuar",
            closeOnConfirm: false
        }, 
        function (isConfirm) {
            if(isConfirm){
                swal({
                    title: "Eliminado",
                    text: "Eliminaste el registro.",
                     showConfirmButton: false,
                    type: "error",
                    timer: 800


                }, function(){

                    '. $id= $_GET['id'] .';

                    '.$trabajador->deleteById($id).';

                    window.location.href="../Vista/trabajador.php?accion=actualizar";

            });


            }
            else{

                window.location.href="../Vista/trabajador.php";
            }
        });</script>';



        break;
    }