Description:
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The changelog says that in 5.0.2, $sort_flags accepts SORT_LOCALE_STRING.
However, in 5.2.9, the parameter $sort_flags was added.

So, does PHP 5.1 accept the $sort_flags parameter or not?

Expected result:
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My *guess* is that SORT_LOCALE_STRING was added in 5.0.2 for sort(). But as
array_unique() got its $sort_flags parameter much later in 5.2.9, this piece of
information is not relevant here.

Remove the 5.0.2 line from the changelog for array_unique().