Recently I have installed php 5.3 on a pc and just like many posts on this forum have been saying the latest version of php does not guarantee 100% backwards compatibility. Especially for some oop parameters where the symbol "&" needs to be used before the variable at specific points unlike php 5.2. Due to these changes php.net recommends for people to upgrade to 5.3 although I wouldn't recommend it myself if you have an existing scripts. Also if you want cms's like mediawiki to work under 5.3 then some modifications to the core of the script will be necessary. Just thought I would point this out as it explains a few of the problems posted in this forum and hopefully this can be made a sticky. Any comments on the issue are welcome...
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I wouldn't disregard it complete, though, out of fear of backwards incompatibility. Not before testing it.
If you are worried about compatibility with older code, setting up a test server on a development machine, or just on your own PC using VirtualBox (or something equivalent), isn't hard to do.…
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