Simple Yet Powerful Geo Library

4.2.0 2022-07-25 08:36 UTC


phpgeo provides abstractions to geographical coordinates (including support for different ellipsoids) and allows you to calculate geographical distances between coordinates with high precision.

Latest Stable Version Total Downloads phpgeo Tests Scrutinizer Code Quality License

Table of Contents


Minimum required PHP version is 7.3. phpgeo fully supports PHP 8 and is tested up to PHP 8.2.

The 3.x releases require PHP >= 7.2 but don't get feature updates any longer. Bugfixes will be backported.

The 2.x releases require PHP >= 7.0 but don't get feature updates any longer. Bugfixes won't be backported.

The 1.x release line has support for PHP >= 5.4. Bugfixes won't be backported.


The documentation is available at https://phpgeo.marcusjaschen.de/


Using Composer, just add it to your composer.json by running:

composer require mjaschen/phpgeo


Update the version constraint in the project's composer.json and run composer update or require the new version by running:

composer require mjaschen/phpgeo:^4.0


Starting with version 2.0.0 phpgeo is licensed under the MIT license. Older versions were GPL-licensed.


Info: Please visit the documentation site for complete and up-to-date documentation with many examples!

phpgeo provides the following features (follow the links for examples):


This list is incomplete, please visit the documentation site for the full monty of documentation and examples!

Distance between two coordinates (Vincenty's Formula)

Use the calculator object directly:


use Location\Coordinate;
use Location\Distance\Vincenty;

$coordinate1 = new Coordinate(19.820664, -155.468066); // Mauna Kea Summit
$coordinate2 = new Coordinate(20.709722, -156.253333); // Haleakala Summit

$calculator = new Vincenty();

echo $calculator->getDistance($coordinate1, $coordinate2); // returns 128130.850 (meters; ≈128 kilometers)

or call the getDistance() method of a Coordinate object by injecting a calculator object:


use Location\Coordinate;
use Location\Distance\Vincenty;

$coordinate1 = new Coordinate(19.820664, -155.468066); // Mauna Kea Summit
$coordinate2 = new Coordinate(20.709722, -156.253333); // Haleakala Summit

echo $coordinate1->getDistance($coordinate2, new Vincenty()); // returns 128130.850 (meters; ≈128 kilometers)

Simplifying a polyline

Polylines can be simplified to save storage space or bandwidth. Simplification is done with the Ramer–Douglas–Peucker algorithm (AKA Douglas-Peucker algorithm).


use Location\Coordinate;
use Location\Polyline;
use Location\Distance\Vincenty;

$polyline = new Polyline();
$polyline->addPoint(new Coordinate(10.0, 10.0));
$polyline->addPoint(new Coordinate(20.0, 20.0));
$polyline->addPoint(new Coordinate(30.0, 10.0));

$processor = new Simplify($polyline);

// remove all points which perpendicular distance is less
// than 1500 km from the surrounding points.
$simplified = $processor->simplify(1500000);

// simplified is the polyline without the second point (which
// perpendicular distance is ~1046 km and therefore below
// the simplification threshold)

Polygon contains a point (e.g. "GPS geofence")

phpgeo has a polygon implementation which can be used to determinate if a point is contained in it or not. A polygon consists of at least three points. Points are instances of the Coordinate class.

Warning: The calculation gives wrong results if the polygons has points on both sides of the 180/-180 degrees meridian.


use Location\Coordinate;
use Location\Polygon;

$geofence = new Polygon();

$geofence->addPoint(new Coordinate(-12.085870,-77.016261));
$geofence->addPoint(new Coordinate(-12.086373,-77.033813));
$geofence->addPoint(new Coordinate(-12.102823,-77.030938));
$geofence->addPoint(new Coordinate(-12.098669,-77.006476));

$outsidePoint = new Coordinate(-12.075452, -76.985079);
$insidePoint = new Coordinate(-12.092542, -77.021540);

var_dump($geofence->contains($outsidePoint)); // returns bool(false) the point is outside the polygon
var_dump($geofence->contains($insidePoint)); // returns bool(true) the point is inside the polygon

Formatted output of coordinates

You can format a coordinate in different styles.

Decimal Degrees


use Location\Coordinate;
use Location\Formatter\Coordinate\DecimalDegrees;

$coordinate = new Coordinate(19.820664, -155.468066); // Mauna Kea Summit

echo $coordinate->format(new DecimalDegrees());

Degrees/Minutes/Seconds (DMS)


use Location\Coordinate;
use Location\Formatter\Coordinate\DMS;

$coordinate = new Coordinate(18.911306, -155.678268); // South Point, HI, USA

$formatter = new DMS();

echo $coordinate->format($formatter); // 18° 54′ 41″ -155° 40′ 42″

$formatter->setSeparator(", ")

echo $coordinate->format($formatter); // 18° 54' 41" N, 155° 40' 42" W



use Location\Coordinate;
use Location\Formatter\Coordinate\GeoJSON;

$coordinate = new Coordinate(18.911306, -155.678268); // South Point, HI, USA

echo $coordinate->format(new GeoJSON()); // { "type" : "point" , "coordinates" : [ -155.678268, 18.911306 ] }


Run Tests

Before submitting a pull request, please be sure to run all checks and tests and ensure everything is green.

  • lint PHP files for syntax errors: composer ci:lint
  • run static analysis with Psalm and report errors: composer ci:psalm
  • run unit tests with PHPUnit: composer ci:tests

To run all checks and tests at once, just use composer ci.

Of course, it's possible to use the test runners directly, e.g. for PHPUnit:




Running GitHub Actions locally

It's possible to run the whole CI test matrix locally with act:

act --rm -P ubuntu-latest=shivammathur/node:latest