- Allow parameter parsing implementation raise an error early where more

- Allow parameter parsing implementation raise an error early where more
  information is available. And add ability to prevent double errors by
  returning "".
- Implement parameter parsing C which checks for a class name, if the value
  on input is not NULL then the pointer must be the zend_class_entry of the
  required base class.
# Do the KISS approach, looking at the code it isn't that easy does it?