firefly-iii/app/Support/ChartProperties.php

<?php

namespace FireflyIII\Support;


use Auth;
use Carbon\Carbon;
use Illuminate\Database\Eloquent\Collection as EloquentCollection;
use Illuminate\Support\Collection;
use Preferences;

/**
 * Class ChartProperties
 *
 * @package FireflyIII\Support
 */
class ChartProperties
{

    /** @var Collection */
    protected $properties;

    /**
     *
     */
    public function __construct()
    {
        $this->properties = new Collection;
        $this->addProperty(Auth::user()->id);
        $this->addProperty(Preferences::lastActivity());
    }

    /**
     * @param $property
     */
    public function addProperty($property)
    {
        $this->properties->push($property);
    }


    /**
     * @return string
     */
    public function md5()
    {
        $string = '';
        //Log::debug('--- building string ---');
        foreach ($this->properties as $property) {

            if ($property instanceof Collection || $property instanceof EloquentCollection) {
                $string .= print_r($property->toArray(), true);
                //                Log::debug('added collection (size=' . $property->count() . ')');
                continue;
            }
            if ($property instanceof Carbon) {
                $string .= $property->toRfc3339String();
                //                Log::debug('Added time: ' . $property->toRfc3339String());
                continue;
            }
            if (is_object($property)) {
                $string .= $property->__toString();
                //                Log::debug('Added object of class ' . get_class($property));
            }
            if (is_array($property)) {
                $string .= print_r($property, true);
                //                Log::debug('Added array (size=' . count($property) . ')');
            }
            $string .= (string)$property;
            //            Log::debug('Added cast to string: ' . $property);
        }

        //        Log::debug('--- done building string ---');

        return md5($string);
    }
}