Programming PHP 2/e == PHP5 only?

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I am trying to learn some codeignitor, which uses php4.

Programming PHP 2/e looks like a decent book, but I get the idea that
it focused on php5, and may not be very useful for PHP4.

Maybe I should see about buying an earlier edition of the book?

Re: Programming PHP 2/e == PHP5 only?

CodeIgnitor can run on PHP5 afaict.

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