Upgrading from 3.1.5 to 3.1.6
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Before performing an update you should take your site offline by
replacing the index.php file with a static one.


Step 1: Update your CodeIgniter files
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Replace all files and directories in your *system/* directory.

Note:

  If you have any custom developed files in these directories, please
  make copies of them first.


Step 2: Remove usage of the APC Cache driver (deprecation)
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The Cache Library APC driver is now deprecated, as the APC extension
is effectively dead, as explained in its PHP Manual page.

If your application happens to be using it, you can switch to another
cache driver, as APC support will be removed in a future CodeIgniter
version.

Note:

  The driver is still available, but you’re strongly encouraged to
  remove its usage sooner rather than later.
