Function folk_call_with_binary 

pub unsafe extern "C" fn folk_call_with_binary(
    func_name: *const c_char,
    method_name: *const c_char,
    method_name_len: usize,
    params: *const c_char,
    params_len: usize,
    response_buf: *mut *mut c_char,
    response_len: *mut usize,
) -> c_int

Call PHP function with raw binary args (no base64). Returns -3 on SIGSEGV.