PHP Leaflet library

This library provides a PHP API to setup the Leaflet map definitions. The goal of the library is to provide a handy way to handle dynamic map configurations working in a PHP context.

Install

You can install the library using composer:

$ php composer.phar require netzmacht/php-leaflet

Features

This library provides different components:

Definition classes to define the leaflet map with all layers, controls and so on.
Value classes which have real behaviour and can be used to handle LatLng or GeoJSON features.
The Encoder component to convert the PHP leaflet definition into javascript.
Support for several Leaflet plugins.
Assets handling to autoload all required javascripts and css files from all plugins.

Before you start

The definition classes has some mixed behaviours. There useful behaviour is implemented. Some method creates just javascript method calls.
The goal is to have a close reflection of the Javascript API. Since the languages differs there are some changes which you should be aware of.

Requirements

This library requires PHP 5.6 and the symfony event dispatcher. The event dispatcher is used by the php-javascript-builder which encodes the PHP definition.

Example

/*
 * 1. Setup the encoder
 */

// The event dispatcher
$dispatcher = new \Symfony\Component\EventDispatcher\EventDispatcher();

// All encoders are event subscribers.
$dispatcher->addSubscriber(new Netzmacht\LeafletPHP\Encoder\ControlEncoder());
$dispatcher->addSubscriber(new Netzmacht\LeafletPHP\Encoder\GroupEncoder());
$dispatcher->addSubscriber(new Netzmacht\LeafletPHP\Encoder\MapEncoder());
$dispatcher->addSubscriber(new Netzmacht\LeafletPHP\Encoder\RasterEncoder());
$dispatcher->addSubscriber(new Netzmacht\LeafletPHP\Encoder\TypeEncoder());
$dispatcher->addSubscriber(new Netzmacht\LeafletPHP\Encoder\UIEncoder());
$dispatcher->addSubscriber(new Netzmacht\LeafletPHP\Encoder\VectorEncoder());

// Create a custom factory for the javascript builder which uses the event dispatcher.
// The order of the registered encoders are important! Only change if you know what you do.
$factory = function(Output $output) use ($dispatcher) {
    $encoder = new ChainEncoder();

    $encoder
        ->register(new \Netzmacht\JavascriptBuilder\Encoder\MultipleObjectsEncoder())
        ->register(new \Netzmacht\JavascriptBuilder\Symfony\EventDispatchingEncoder($dispatcher))
        ->register(new \Netzmacht\JavascriptBuilder\Encoder\JavascriptEncoder($output));

    return $encoder;
}; 

$builder = new \Netzmacht\JavascriptBuilder\Builder($factory);
$leaflet = new \Netzmacht\LeafletPHP\leaflet($builder, $dispatcher);

/*
 * 2. Create the map definitions
 */
$map = new \Netzmacht\LeafletPHP\Definition\Map('html_id', 'map');
$map
  ->setZoom(12)
  ->addControl(...)
  ->addLayer(...);
  
/*
 * 3. Build the javascript
 */

// Will return javascript with following local vars: "map", "layers", "controls", "icons".
echo $leaflet->build($map);