phayes/geoPHP — pull request #92 by mprins (2014-06-16 14:06:18+00:00)
Title: Add adjacent geohash function

Adds the ability to calculate adjacent/surrounding geohashes so that nearby hashes can be retrieved eg. for indexing. Based on algorithm found in various codebases that seem to point back to David Troy's implementation in geohash-js which was published under a MIT copyright notice (see: https://github.com/davetroy/geohash-js)