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I see my host is only running PHP 5.2.17, while I am developing for 5.3.8. I want to put pressure on the host to upgrade, but I would like to prepare a better case than just "newer is better". How much work is required for a server admin to upgrade PHP versions, and if any, how much risk is incurred?

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closed as off topic by Rarst♦ Dec 26 '11 at 8:41

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This is a pretty interesting. As long as the version used does not break backward compatibility a newer version should not have any issues. You might miss some bleeding edge php features if used. Though looking at the changelog, I don't see much new features added which might break on going a few versions behind. YMMV

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Anonymous functions and late static binding are new in 5.3, the first being quite notable. – ProfK Dec 26 '11 at 7:24

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