Laravel报错：Undefined variable: REQUEST，数据库插入失败

核心问题 #

PHP变量名区分大小写，你在控制器方法中声明的参数是小写的$request，但代码里调用时写成了大写的$REQUEST，导致系统找不到该变量，抛出未定义错误。

修复后的控制器代码 #

public function insert(Request $request)
{
    $deceased_infos = new deceased_info(); 
    $deceased_infos->lastname = $request->input('dlastname');
    $deceased_infos->firstname = $request->input('dfirstname');
    $deceased_infos->middlename = $request->input('dmiddlename');
    $deceased_infos->save();

    return redirect('/resident')->with('status', "Inserted!!!");   
}

额外优化建议 #

• Laravel模型名遵循大驼峰命名规范，建议将deceased_info改为DeceasedInfo，对应的数据表名保持deceased_infos即可（Laravel默认模型名的复数形式对应数据表名）。
• 可使用批量赋值简化代码，先在模型中添加允许批量赋值的字段：

  class DeceasedInfo extends Model
  {
      protected $fillable = ['lastname', 'firstname', 'middlename'];
  }
  

  之后控制器代码可简化为：

  public function insert(Request $request)
  {
      DeceasedInfo::create([
          'lastname' => $request->input('dlastname'),
          'firstname' => $request->input('dfirstname'),
          'middlename' => $request->input('dmiddlename')
      ]);
  
      return redirect('/resident')->with('status', "Inserted!!!");   
  }
  

内容的提问来源于stack exchange，提问作者CH405