$collectionHandler = new \triagens\ArangoDb\CollectionHandler($connection);
$edgeCollection = new \triagens\ArangoDb\Collection();
$edgeCollection->setName('EdgeCollection');
$edgeCollection->set('type', 3);
$collectionHandler->create($edgeCollection);

$document1 = new \triagens\ArangoDb\Document();
$document2 = new \triagens\ArangoDb\Document();
$documentHandler = new \triagens\ArangoDb\DocumentHandler($connection);
$document1->someAttribute = 'someValue1';
$document2->someAttribute = 'someValue2';

$edgeDocument = new \triagens\ArangoDb\Edge();
$edgeDocumentHandler = new \triagens\ArangoDb\EdgeHandler($connection);

$documentId1 = $documentHandler->save('ArangoDBPHPTestSuiteTestCollection01', $document1);
$documentId2 = $documentHandler->save('ArangoDBPHPTestSuiteTestCollection01', $document2);
$documentHandle1=$document1->getHandle();
$documentHandle2=$document2->getHandle();

$edgeDocument->set('label','knows');
$edgeDocumentId = $edgeDocumentHandler->saveEdge($edgeCollection->getId(), $documentHandle1, $documentHandle2, $edgeDocument);