I was intrigued by the algorithm used to create “geohashes” and so I wrote this PHP class to encode and decode them.
It comes with a test harness and passes enough tests to reasonably sure it is compatible with the reference implementation at geohash.org. That said, I’d regard it as beta – I’m sure the code could be heavily optimised, but might serve as base for translation into other languages.
Download geohash.tar.gz (15Kb)
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But it is not compatible with geohash.org.
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