vectorial1024 / open-location-code-php
Open Location Code (aka "Plus Code") implemented in PHP
Requires
- php: ^8.3
Requires (Dev)
- phpunit/phpunit: ^11
This package is auto-updated.
Last update: 2024-11-13 07:38:01 UTC
README
This is a modern PHP port of the google/open-location-code
repository. Please visit https://github.com/google/open-location-code for discussion and up-to-date information about Open Location Code ("OLC", aka "Plus Code") itself. This repository only concerns the PHP implementation.
But still, a short quote from said repository to introduce Open Location Code (OLC):
Open Location Code is a technology that gives a way of encoding location into a form that is easier to use than latitude and longitude. The codes generated are called plus codes, as their distinguishing attribute is that they include a "+" character.
An external demo is available to showcase the functionality of Open Lcation Code.
Implementation notes
This PHP implementation is adapted from the Java implementation of google/open-location-code
.
This implementation tries to use latest PHP features where possible.
Licence follows google/open-location-code
.
Installation
via Composer:
composer require vectorial1024/open-location-code-php
Special Notice: to ensure 32-bit PHP compatibility, this library will check the PHP runtime and, if it detects a 32-bit PHP runtime, will use float
variables instead of int
variables to calculate Open Location Codes.
This may cause some unintended inaccuracies in 32-bit PHP, but generally speaking, there should be no problems.
Example code
Checking and creating OLC codes
use Vectorial1024\OpenLocationCodePhp\OpenLocationCode; // This code snippet will center around King's Cross station in London, UK. // Its main entrance at (51.530812, -0.123767) has the Open Location Code of "9C3XGVJG+8F". $invalidCode = "11iL!Illi1!!!"; $kingsCrossLatitude = 51.530812; $kingsCrossLongitude = -0.123767; $kingsCrossCode = "9C3XGVJG+8F"; // test validity of the code $validity = OpenLocationCode::isValidCode($invalidCode); // invalid code; returns false $validity = OpenLocationCode::isValidCode($kingsCrossCode); // valid code; returns true // create object from code $invalidObject = OpenLocationCode::createFromCode($invalidCode); // invalid code; throws InvalidArgumentException $validObject = OpenLocationCode::createFromCode($kingsCrossCode); // returns OpenLocationCode instance // alternatively, create object from coordinates $anotherValidObject = OpenLocationCode::createFromCoordinates($kingsCrossLatitude, $kingsCrossLongitude); // returns OpenLocationCode instance // you may check the code is valid $validity = $validObject->isValid(); // returns true $validity = $anotherValidObject->isValid(); // also returns true // you may also read the code... assert($kingsCrossCode == $validObject->code); // passes $code = (string) $validObject; // also, can be explicitly casted to string assert($kingsCrossCode == $code); // passes // ...to know that both methods result in the same code assert($validObject->code == $anotherValidObject->code); // also passes // but you may not modify the code (create a new instance instead!) $validObject->code = "something else"; // PHP runtime error: $code is read-only
Other references
A quick reference of available classes/methods; please see the PHPDoc for details.
OpenLocationCode:
/* Vectorial1024\OpenLocationCodePhp\OpenLocationCode */ class OpenLocationCode implements Stringable { public readonly string $code; // The explicit string cast gives $this->code; public const int CODE_PRECISION_NORMAL = 10; public static function createFromCode(string $code): self; public static function createFromCoordinates(float $latitude, float $longitude, int $codeLength = self::CODE_PRECISION_NORMAL): self; public static function encode(float $latitude, float $longitude, int $codeLength = self::CODE_PRECISION_NORMAL): string; public function decode(): Vectorial1024\OpenLocationCodePhp\CodeArea; public function shorten(float $referenceLatitude, float $referenceLongitude): self; public function recover(float $referenceLatitude, float $referenceLongitude): self; public function contains(float $latitude, float $longitude): bool; // note: if you need to call contains() many times on the same $this, consider decoding $this first, and then call contains() on the resulting CodeArea instance public static function isValidCode(string $code): bool; public function isValid(): bool; public function isFull(): bool; public function isShort(): bool; public function isPadded(): bool; }
CodeArea:
/* Vectorial1024\OpenLocationCodePhp\CodeArea */ class CodeArea { public readonly float $southLatitude; public readonly float $westLongitude; public readonly float $northLatitude; public readonly float $eastLongitude; public readonly int $length; public function getLatitudeHeight(): float; public function getLongitudeWidth(): float; public function getCenterLatitude(): float; public function getCenterLongitude(): float; public function contains(float $latitude, float $longitude): bool; }
Testing
PHPUnit via Composer:
composer run-script test