getDepth() public method

Returns depth
public getDepth ( ) : integer
return integer
 /**
  * Move entity hierarchy to new parent or root
  *
  * @param Permission  $permission permission instance
  * @param string|null $to         to prefix
  * @return void
  * @throws InvalidArgumentException
  * @throws NoParentException
  */
 public function move(Permission $permission, $to = null)
 {
     $toParent = $to !== null ? $this->repo->findByName($permission->siteKey, $to) : null;
     if ($to !== null && $toParent === null || $toParent !== null && $permission->type != $toParent->type) {
         throw new InvalidArgumentException(['arg' => $to]);
     }
     $parent = $permission->getParent();
     if ($parent === null) {
         if ($permission->getDepth() !== 1) {
             throw new NoParentException();
         }
         $this->repo->affiliate($permission, $to);
     } else {
         $this->repo->foster($permission, $to);
     }
 }