[php_print!](https://docs.rs/ext-php-rs/0.14.1/ext_php_rs/macro.php_print.html) panics on NUL. I am looking for an idiomatic way to write to these virtual pipes. I sure could use `Function::try_from_function("fwrite")` + try_call() + STDOUT/STDERR constants, there has to be another way :-)