class stdClass 对象的问题无法转换为字符串

Question

这一行有错误 $number = "$autonumber[0]/$automonth/$autoyear/proforma";。这是错误：https://flareapp.io/share/qm1WG17d 我正在尝试使函数将每月的预制数量添加到其他数据。我不知道我做错了什么。有人帮帮我吗？

这是具有此功能的控制器生成错误：

public function store(Request $request)
{
    $autoyear = date('Y');
    $automonth = date('m');

    $autonumber = DB::table('proforms')
        ->select(DB::raw('MAX(autonumber) as autonumber'))
        ->where('automonth', '=', '$automonth')
        ->where('autoyear', '=', '$autoyear')
        ->get();
    $autonumber[0]++;
    $number = "$autonumber[0]/$automonth/$autoyear/proforma";
    DB::table('proforms')->insert(
        ['autonumber' => $number, 'automonth' => $automonth, 'autoyear' => $autoyear]
    );

    request()->validate([
        'user_id' => 'required',
        'proformdate' => 'required',
        'selldate' => 'required',
        'paymentmethod' => 'required',
        'paymentdate' => 'required',
        'status' => 'nullable',
        'city' => 'nullable',
        'comments' => 'nullable',
        'name' => 'required',
        'PKWIU' => 'nullable',
        'quantity' => 'required',
        'unit' => 'required',
        'netunit' => 'required',
        'nettotal' => 'required',
        'VATrate' => 'required',
        'grossunit' => 'required',
        'grosstotal' => 'required',

    ]);

    Proform::create($request->all());

    return redirect()->route('proforms.index')
        ->with('success', 'Proform created successfully.');
}

dd($autonumber)之后；我得到：

Illuminate\Support\Collection {#1328 ▼
  #items: array:1 [▼
    0 => {#1324 ▼
      +"autonumber": null
    }
  ]
}

在print_r($autonumber)之后；

  Illuminate\Support\Collection Object ( [items:protected] => Array ( [0] => stdClass Object ( [autonumber] => ) ) )

Answer 1

有一个误会，下面的代码不会return一个整数，而是一个具有以下结构的对象：{"autonumber": 42}.

$autonumber = DB::table('proforms')
    ->select(DB::raw('MAX(autonumber) as autonumber'))
    ->where('automonth', '=', '$automonth')
    ->where('autoyear', '=', '$autoyear')
    ->get();

更改代码以使用该结构。

$autonumber[0]->autonumber++;
$number = $autonumber[0]->autonumber;
$number = "$number/$automonth/$autoyear/proforma";

class stdClass 对象的问题无法转换为字符串

Problem with Object of class stdClass could not be converted to string

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