Description:
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Looking at internal PHP code, there is existing code to allow for the 1a variants of FNV (http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-1a).  However, this code is never used - the only option with has() is the original algorithms, not the 1a algorithms.

This patch adds support for the 1a variants to the hash list.  I'm considering this a bug report, rather than a feature request, since the code to do the hashing already exists... this just seems to be an oversight.

Patch will be provided on Github.