How to downgrade a certain ubuntu 10.04 package (php) back to karmic

Hi! I've updated from 9.10 to 10.04 but unfortunately the PHP provided with 10.04 is not yet supported by zend optimizer. As far as I understand I need to somehow replace the PHP 5.3 package provided under 10.04 with an older PHP 5.2 package provided under 9.10. However I am not sure whether this is the right way to downgrade PHP and if yes, I don't know how to replace the 10.04 package with 9.10 package. Could you please help me with that?

From serverfault Eugene

• This thread will tell you exactly how to downgrade PHP from 5.3 to 5.2 in Ubuntu 10.04:

  http://ubuntuforums.org/archive/index.php/t-1447401.html

  Goodluck!

  Eugene : Thanks! I also found this thread where someone crated and posted a script which does the work http://ubuntuforums.org/showthread.php?t=1459163
  From iainlbc

• This post tell you how to install php from "karmic" repositary http://mrkandy.wordpress.com/2010/04/16/install-php-5-2-x-in-ubuntu-10-04-lucid/

  From

• how to install php 5.2 package in ubuntu 10.04

  From Muzaffar D.K