title: How to set Apache HTTP 503 error code instead of HTTP 500 on PHP error
body: <p>any ideas how to replace Apache HTTP 500 (Internal Server Error) error by HTTP 503 (Service Unavailable) on PHP error once PHP error displaying is off? This is much better option to inform spiders to back to the site soon...</p>
  
  <p>P.S.
  would be great to be able to append Retry-After to the 50x error codes if possible...</p>
  
  <p>cheers,
  /Marcin</p>