Zend Optimizer - Install and Test Compatibility with CiviCRM Trunk

We need to understand what combinations of php and the Zend optimizer will work with CiviCRM. Based on several user problems, we know that php4.3.11 with v2.5.7 of the Zend Optimizer causes CiviCRM to malfunction (search results are displayed w/o data values, etc.)

1. Download current generally available version from: http://www.zend.com/store/products/zend-optimizer.php

(I believe this is 2.5.10 ??)

2. Install optimizer and test with both php4.3.11 and php5

3. Research how folks can disable/turn off Optimizer if their hosting service is running an incompatible version (I think this can be done by changing some setting(s) in php.ini ??? )