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Perhaps 5.4 made some breaking changes so they'll keep updating 5.3 with security fixes and such for a while until it's fair to ask people to upgrade.

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Yes, 5.4 introduced breaking changes such as the new array syntax (finally!), among other things. There was also a very heavy amount of refactoring internally in the Zend Engine, which could cause extensions to break.

The new array syntax isn't a breaking change; however there was a lot of functionality deprecated in 5.3 that was completely removed in 5.4 which would definitely break some code.

Unfortunately there were some bugs introduced in 5.4 that are preventing us from upgrading (our actual code is fine). Quite a shame as I'm quite looking forward to the new additions.

I probably should have worded that better, but what I meant was that the new syntax will cause errors on 5.3.

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