PHP ext rs call_user_func with object as param

lib.rs

#![cfg_attr(windows, feature(abi_vectorcall))]

use ext_php_rs::{prelude::*, types::{Zval, ZendObject}, flags::DataType, ffi::_zval_struct, convert::IntoZval, call_user_func};

#[php_function]
pub fn cname(obj: &mut Zval) -> String {
    let f = "get_class".into_zval(false).unwrap();
    let param = ObjAsParamHack{inner: obj.shallow_clone()};
    //let param = obj.shallow_clone();
    //let param = ZendObject::from(obj.???);
    let result = call_user_func!(f, param).unwrap();
    result.string().unwrap()
}

struct ObjAsParamHack{inner: Zval}

impl Clone for ObjAsParamHack {
    fn clone(&self) -> Self {
        Self { inner: self.inner.shallow_clone() }
    }
}

impl IntoZval for ObjAsParamHack {
    const TYPE: DataType = DataType::Reference;

    fn into_zval(self, _persistend: bool) -> Result<_zval_struct, ext_php_rs::error::Error> {
        Ok(self.inner)
    }

    fn set_zval(self, zv: &mut Zval, _persistent: bool) -> Result<(), ext_php_rs::error::Error> {
        let Self { inner } = self;
        *zv = inner;
        Ok(())
    }
}

// Required to register the extension with PHP.
#[php_module]
pub fn module(module: ModuleBuilder) -> ModuleBuilder {
    module
}

test.php

<?php

class DTO {}

echo cname(new DTO()) . PHP_EOL;