I have Magento 184.108.40.206 installed on a server that still had PHP 5.2 on it. When I realised I upgraded to 5.4 as the Magento site states that it is compatible. Once I did this it occurred to me that Magento may install differently depending on what version of PHP you have.
Is this the case or am I safe upgrading PHP under Magento? I am assuming so as I cannot find anything about it, and after all you need to keep PHP up to date, but I feel I need to check.