azhai / geohash

simple php geohash class

GeoHash

Simple php geohash class like python-geohash.

Getting Started

Install

You may install GeoHash with Composer (recommended) or manually.

Just add 'geo/geohash' to your composer.json and run composer install.

System Requirements

You need PHP >= 5.4.0.

Usage

Encode a coordinate:

use Geo\GeoHash;
echo GeoHash::encode(117.031689,36.65396);

The result is wwe0x0euu12.

The default precision is 0.00001 which can be changed by the third parameter of encode method.

Find the neighbors for a given geohash:

use Geo\GeoHash;
var_dump(GeoHash::expand('wwe0x0'));

and the result is:

array(8) {
  [0] =>
  string(11) "wwe0wc7zzzz"
  [1] =>
  string(11) "wwe0x17zzzz"
  [2] =>
  string(11) "wwe0x37zzzz"
  [3] =>
  string(11) "wwe0wb7zzzz"
  [4] =>
  string(11) "wwe0x27zzzz"
  [5] =>
  string(11) "wwe0qz7zzzz"
  [6] =>
  string(11) "wwe0rp7zzzz"
  [7] =>
  string(11) "wwe0rr7zzzz"
}

Decode a geohash string:

Use Geo\GeoHash;
var_dump(GeoHash::decode('wwe0x0'));

and the result is:

array(4) {
  [0] =>
  double(117.0263671875)    # min longitude
  [1] =>
  double(117.03735351562)   # max longitude
  [2] =>
  double(36.650390625)      # min latitude
  [3] =>
  double(36.655883789062)   # max latitude
}