README

Well-known text (WKT) is a text markup language for representing vector geometry objects on a map, spatial reference systems of spatial objects and transformations between spatial reference systems.

EWKT (Extended Well-Known Text), a PostGIS-specific format that includes the spatial reference system identifier (SRID) and up to 4 ordinate values (XYZM), is also supported (ex: SRID=31370;POINT(44 60)).

PHPWKTParser provides a simple usage helper class to read WKT and EWKT and parse this text representation to a workable PHP array holding the parsed WKT/EWKT definition. Read and parse 2D, 3D and 4D WKT (Well Known Text) / EWKT (Extended Well-Known Text) object strings into geometry objects with this simple WKT PHP adapter library.

Installation

Install the package through composer:

composer require daandesmedt/phpwktadapter

Make sure, that you include the composer autoloader somewhere in your codebase.

Supported geometry

PHPWKTParser parsed and returned geometry array response

The read($wkt) function of the PHPWKTParser adapter will return a associative array as representation of the parsed WKT/EWKT (in case of valid).

array(
    // the geometry object type
    "type"      =>  string,
    // integer or float values for POINT - nested array (integer or float) for other geometry types
    "value"     =>  array,
    // integer representing the EWKT SRID, null when not present 
    "srid"      =>  integer | null,
    // string (Z, M or ZM) representing the dimension, null when not present 
    "dimension" =>  string | null
)

Working examples

Working examples can be found in the examples folder.

Sample usage

<?php 

require __DIR__ . '/../vendor/autoload.php';

use daandesmedt\PHPWKTAdapter\WKTAdapter;

$adapter = new WKTAdapter();
$res = $adapter->read('SRID=31370;POINT(30 10)');
var_dump($res); 

Handling exceptions

Invalid format in the specified WKT / EWKT will result in a UnexpectedValueException thrown by the WKTAdapter .

<?php 

require __DIR__ . '/../vendor/autoload.php';

use daandesmedt\PHPWKTAdapter\WKTAdapter;

$adapter = new WKTAdapter();

try {
    $res = $adapter->read('SRID=31370;POINT(bad format)');
} catch (UnexpectedValueException $e) {
    var_dump($e->getMessage());
}