public function exists() {
        list($missingparent, $loops) = $this->find_problems();
        return !empty($missingparent) || !empty($loops);
    }
public function exists() {
        list($missingparent, $loops) = $this->find_problems();
        return !empty($missingparent) || !empty($loops);
    }
public function exists ( ) { list ( $ missingparent , $ loops ) = $ this -> find_problems ( ) ; return ! empty ( $ missingparent ) || ! empty ( $ loops ) ; }
Check if the problem exists.

@return boolean True if either missing parents or loops found
Check if the problem exists .