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You can find a list of all changes for each release in the user guide change log.
PHP version 5.4 or newer is recommended.
It should work on 5.2.4 as well, but we strongly advise you NOT to run such old versions of PHP, because of potential security and performance issues, as well as missing features.
Please see the installation section of the CodeIgniter User Guide.
Please see the license agreement.
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The CodeIgniter team would like to thank EllisLab, all the contributors to the CodeIgniter project and you, the CodeIgniter user.