Running PHP 3 and PHP 4 concurrently
Recent operating systems provide the ability to perform
versioning and scoping. This features make it possible to let
PHP 3 and PHP 4 run as concurrent modules in one Apache server.
This feature is known to work on the following platforms:
To enable it, configure PHP 3 and PHP 4 to use APXS
(--with-apxs) and the necessary link extensions
(--enable-versioning). Otherwise, all standard installations
instructions apply. For example: