Symfony\Component\ClassLoader\ClassCollectionLoader::getClassHierarchy PHP Method

    private static function getClassHierarchy(\ReflectionClass $class)
    {
        if (isset(self::$seen[$class->getName()])) {
            return array();
        }
        self::$seen[$class->getName()] = true;
        $classes = array($class);
        $parent = $class;
        while (($parent = $parent->getParentClass()) && $parent->isUserDefined() && !isset(self::$seen[$parent->getName()])) {
            self::$seen[$parent->getName()] = true;
            array_unshift($classes, $parent);
        }
        $traits = array();
        foreach ($classes as $c) {
            foreach (self::resolveDependencies(self::computeTraitDeps($c), $c) as $trait) {
                if ($trait !== $c) {
                    $traits[] = $trait;
                }
            }
        }
        return array_merge(self::getInterfaces($class), $traits, $classes);
    }