NOTE: This is not a job for practicing, you must be an expert to do the work!
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I have a virtual server built on CentOS 6.6 with different domains hosted and administered through Virtualmin/Webmin. Right now I have successfully installed dual PHP versions --> 5.4.41 and 5.6.9. These PHP versions are recognized by Virtualmin/Webmin and can be set for use in different domains/directories different versions of PHP.
Now I need also a third version of PHP (3.3.29) installed without making any damage to previous versions of PHP OR to the system.
Its very simple if you have strong experience on Linx OS and Servers but to be able to do this work successfully, you really need a good experience of previously mentioned OS, Servers and tuning of them.
I have worked on several similar projects. I intend to work on your project and get it done.
I need some details regarding your description. Can we discuss them?