protected function prepareVertices($data)
    {
        $vertices = [];
        foreach ($data as $content) {
            // identifiers must be strings or SplObjectStorage::contains fails
            // seems to impact only PHP 5.6
            $content->term_id = "$content->term_id";
            $content->parent_id = "$content->parent_id";

            if (!array_key_exists($content->term_id, $vertices)) {
                $vertices[$content->term_id] = new Vertex($content->term_id);
            }

            if (!array_key_exists($content->parent_id, $vertices)) {
                $vertices[$content->parent_id] = new Vertex($content->parent_id);
            }
        }

        return $vertices;
    }
protected function prepareVertices($data)
    {
        $vertices = [];
        foreach ($data as $content) {
            // identifiers must be strings or SplObjectStorage::contains fails
            // seems to impact only PHP 5.6
            $content->term_id = "$content->term_id";
            $content->parent_id = "$content->parent_id";

            if (!array_key_exists($content->term_id, $vertices)) {
                $vertices[$content->term_id] = new Vertex($content->term_id);
            }

            if (!array_key_exists($content->parent_id, $vertices)) {
                $vertices[$content->parent_id] = new Vertex($content->parent_id);
            }
        }

        return $vertices;
    }
protected function prepareVertices ( $ data ) { $ vertices = [ ] ; foreach ( $ data as $ content ) { // identifiers must be strings or SplObjectStorage::contains fails // seems to impact only PHP 5.6 $ content -> term_id = "$content->term_id" ; $ content -> parent_id = "$content->parent_id" ; if ( ! array_key_exists ( $ content -> term_id , $ vertices ) ) { $ vertices [ $ content -> term_id ] = new Vertex ( $ content -> term_id ) ; } if ( ! array_key_exists ( $ content -> parent_id , $ vertices ) ) { $ vertices [ $ content -> parent_id ] = new Vertex ( $ content -> parent_id ) ; } } return $ vertices ; }
Prepare the vertices to create the graph.

@param \Illuminate\Support\Collection $data The list of vertices that were retrieved
@return array<Vertex>
Prepare the vertices to create the graph .