Laravel验证名称没有抛光字母

Question

您好我有一种方法可以改变普通字母上的抛光字母。例如：

  

łódź更改为 lodz

或

  

Michał改为 Michal

private $letter = array( 'Ę', 'Ó', 'Ą', 'Ś', 'Ł', 'Ż', 'Ź', 'Ć', 'Ń', 'ę', 'ó', 'ą', 
    'ś', 'ł', 'ż', 'ź', 'ć', 'ń' );
private $change = array( 'E', 'O', 'A', 'S', 'L', 'Z', 'Z', 'C', 'N', 'e', 'o', 'a', 
    's', 'l', 'z', 'z', 'c', 'n' );

public function changeLetter( $string )
{
    $string = str_replace( $this->letter, $this->change, $string );
    $string = preg_replace( '#[^a-z0-9]#is', ' ', $string );
    $string = trim( $string );

    return $string;
}

将新记录保存到数据库的方法：

public function store(CreateWarehouseRequest $request){
    $downloadNameWarehouse = Input::get('name_warehouse');
    $changeLetter = $this->changeLetter($downloadNameWarehouse);
    $warehouse = new warehouse($request->all());

    Auth::user()->warehouses()->save($warehouse);

}

如何将验证changeLetter添加到方法store？