/**
  * Function to sort given pages by recursiveRootLineOrdering string
  *
  * @param \PwTeaserTeam\PwTeaser\Domain\Model\Page $a
  * @param \PwTeaserTeam\PwTeaser\Domain\Model\Page $b
  * @return integer
  */
 protected function sortByRecursivelySorting(\PwTeaserTeam\PwTeaser\Domain\Model\Page $a, \PwTeaserTeam\PwTeaser\Domain\Model\Page $b)
 {
     if ($a->getRecursiveRootLineOrdering() == $b->getRecursiveRootLineOrdering()) {
         return 0;
     }
     return $a->getRecursiveRootLineOrdering() < $b->getRecursiveRootLineOrdering() ? -1 : 1;
 }