src/Baum/Node.php
public function getLeftSibling() {
    return $this->siblings()
                ->where($this->getLeftColumnName(), '<', $this->getLeft())
                ->orderBy($this->getOrderColumnName(), 'desc')
                ->get()
                ->last();
  }
public function getLeftSibling() {
    return $this->siblings()
                ->where($this->getLeftColumnName(), '<', $this->getLeft())
                ->orderBy($this->getOrderColumnName(), 'desc')
                ->get()
                ->last();
  }
public function getLeftSibling ( ) { return $ this -> siblings ( ) -> where ( $ this -> getLeftColumnName ( ) , '<' , $ this -> getLeft ( ) ) -> orderBy ( $ this -> getOrderColumnName ( ) , 'desc' ) -> get ( ) -> last ( ) ; }
Returns the first sibling to the left.

@return NestedSet
Returns the first sibling to the left .