advices on implementing reserve management solution

public function save() {
    return $this->saveSqlElement();
  }

  public function insert() { // Specific function to force insert with a defined id - Reserved to Import fonction
    return $this->saveSqlElement(false, false, true);
  }

public function save() {
    if (isset($this->_onlyCallSpecificSaveFunction) and $this->_onlyCallSpecificSaveFunction==true) return;
    return $this->saveSqlElement();
  }

  public function insert() { // Specific function to force insert with a defined id - Reserved to Import fonction
    $this->_onlyCallSpecificSaveFunction=true;
    $this->save(); // To force the update of fields calculated in the save function ...
    $this->_onlyCallSpecificSaveFunction=false;
    return $this->saveSqlElement(false, false, true);
  }