Question

我一直收到此错误未定义的变量：checkInDate ，当我已经定义它时。

public function checkAvailable(Request $request){
    $checkInDate = date("Y-m-d", strtotime($request->start_date));
    $checkOutDate = date("Y-m-d", strtotime($request->end_date));

  $availableRooms = availableRoom::whereHas('reservation',function($query){
        $query->where(function($query){
            $query->whereDate('reservationDate', '>=', $checkInDate);
            $query->whereDate('reservationDate', '<=', $checkOutDate);
        })->orWhere(function($query){
            $query->whereDate('expiryDate', '>=', $checkInDate);
            $query->whereDate('expiryDate', '<=', $checkOutDate);
        });
    })->get();

    return $availableRooms;

}

checkInDate已经具有一个值。我想念什么吗？

Answer 1

您需要在每个函数中添加一个use（），以便该函数可以访问该变量，否则它只能访问传递给该变量的变量。

public function checkAvailable(Request $request){
    $checkInDate = date("Y-m-d", strtotime($request->start_date));
    $checkOutDate = date("Y-m-d", strtotime($request->end_date));

  $availableRooms = availableRoom::whereHas('reservation',function($query) use ($checkInDate, $checkOutDate) {
        $query->where(function($query) use ($checkInDate, $checkOutDate){
            $query->whereDate('reservationDate', '>=', $checkInDate);
            $query->whereDate('reservationDate', '<=', $checkOutDate);
        })->orWhere(function($query) use ($checkInDate, $checkOutDate){
            $query->whereDate('expiryDate', '>=', $checkInDate);
            $query->whereDate('expiryDate', '<=', $checkOutDate);
        });
    })->get();

    return $availableRooms;

}

Answer 2

由于您试图在回调中访问变量，因此需要使用do.call(rbind, Map(cbind, index = seq_along(foo), foo)) # index x y #1 1 a 1 #2 1 b 2 #3 1 c 3 #4 2 d 4 #5 2 e 5 #6 2 f 6语句将变量传递给回调。

use

由于您还尝试使用public function checkAvailable(Request $request){ $checkInDate = date("Y-m-d", strtotime($request->start_date)); $checkOutDate = date("Y-m-d", strtotime($request->end_date)); $availableRooms = availableRoom::whereHas('reservation',function($query)use($checkInDate, $checkOutDate){ ... });，因此还需要将其传递给回调，并以逗号分隔。

Answer 3

替换：

 $availableRooms = availableRoom::whereHas('reservation',function($query){

作者：

 $availableRooms = availableRoom::whereHas('reservation',function($query) use($checkInDate,$checkOutDate) {

定义时未定义的变量

3 个答案: