Source code:
include("fxcore.php");
$multiPolygonJson = "{\"coordinates\":[[[[0.000000,0.000000],[1.100000,1.100000],[2.200000,2.200000,2.200000],[0.000000,0.000000,2.200000]]]],\"type\":\"MultiPolygon\"}";
$jsonReader = new \fire\gear\io\JsonReader();
$multiPolygon = $jsonReader->read($multiPolygonJson);
echo "multi polygon: " . $multiPolygon->toString() . "\n";
Output: