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Codeigniter, whilst good, only runs on PHP 4:

http://codeigniter.com/user_guide/overview/at_a_glance.html

which means they've missed all the performance and security improvements in PHP 5 (like applying filters to user input), not to mention that PHP 4 is end of life now.

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Taken from that same page: "Note: CodeIgniter will run on PHP 5. It simply does not take advantage of any native features that are only available in that version."

So, it does run on PHP5, just doesn't use PHP5 only features for the sake of backwards compatibility. For PHP5 one can use KohanaPHP, as mentioned by another comment :)

it runs on 5. and 4.

edit: what arien said. plus, again, if it doesn't fit your needs, you can jump from CI to something else pretty readily.

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