The following table indicates which version of PHP is compatible
with Zend Guard/Optimizer on Linux

+-------------+-----------+--------------+
| PHP Version | Zend Name | Zend Version |
+-------------+-----------+--------------+
| 5.2         | Optimizer | 3.3.9        |
| 5.3         | Guard     | 5.5          |
| 5.4         | Guard     | 6.0          |
+-------------+-----------+--------------+

