Doctrine\Common\DataFixtures\Loader::getUnsequencedClasses PHP Method

    private function getUnsequencedClasses($sequences, $classes = null)
    {
        $unsequencedClasses = array();
        if (is_null($classes)) {
            $classes = array_keys($sequences);
        }
        foreach ($classes as $class) {
            if ($sequences[$class] === -1) {
                $unsequencedClasses[] = $class;
            }
        }
        return $unsequencedClasses;
    }