PHP创建多维数组

我正在尝试使用foreach循环在PHP中创建多维数组。以下是迄今为止的代码：

for($day1=$day; $day1<=2; $day1++)
{
$train_list['option'][] = array('day' => $day1);
$train = $train_xpath->query('//li/div/div[contains(@class, "smallFont farelist")]');
if($train->length > 0)
{
    foreach($train as $f) 
    {
        $time_s =  $train_xpath->evaluate('string(./div[@class="train-time"]/text()[1])', $f);
        $time_e =  $train_xpath->evaluate('string(./div[@class="train-time"]/text()[2])', $f);
        $fare = $train_xpath->evaluate('string(./div[@class="train-info"]/div/div[@class="total-price"])', $f);
        $train_list['option'][0]["value"][]=  array('train_no' => $train_xpath->evaluate('string(./div[@class="train-no"])', $f),
                                                     'departure_time' => "$time_s ",
                                                     'arrival_time' => "$time_e ",
                                                     'price' => $fare );

                    }
}
}

然而，这不是目的。所需的阵列应如下所示：

    Array
(
    [option] => Array
        (
            [0] => Array
                (
                    [day] => 1
                    [value] => Array
                        (
                            [0] => Array
                                (
                                    [train_no] => D7  372
                                    [departure_time] => 10:00 
                                    [arrival_time] => 14:40 
                                    [price] =>  69.00
                                )

                            [1] => Array
                                (
                                    [train_no] => D7  376
                                    [departure_time] => 17:45 
                                    [arrival_time] => 22:25 
                                    [price] =>  59.00
                                )

                        )

                )

            [1] => Array
                (
                    [day] => 2
                )

        )

)

Array
(
    [option] => Array
        (
            [0] => Array
                (
                    [day] => 1
                    [value] => Array
                        (
                            [0] => Array
                                (
                                    [train_no] => D7  372
                                    [departure_time] => 10:00 
                                    [arrival_time] => 14:40 
                                    [price] =>  59.00
                                )

                            [1] => Array
                                (
                                    [train_no] => D7  376
                                    [departure_time] => 17:45 
                                    [arrival_time] => 22:25 
                                    [price] =>  49.00
                                )

                        )

                )

            [1] => Array
                (
                    [day] => 2
                    [value] => Array
                        (
                            [0] => Array
                                (
                                    [train_no] => D7  372
                                    [departure_time] => 10:00 
                                    [arrival_time] => 14:40 
                                    [price] =>  59.00
                                )

                            [1] => Array
                                (
                                    [train_no] => D7  376
                                    [departure_time] => 17:45 
                                    [arrival_time] => 22:25 
                                    [price] =>  69.00
                                )

                        )

                )

        )

)

---

如何修改代码以实现目标？

您正在覆盖索引0。为了避免这样做并用未知数量的条目填充数组，您需要首先构建条目，然后将其分配给数组的下一个值。如果知道条目数，可以使用计数器并通过该索引访问数组

试试这个：

for($day1=$day; $day1<=2; $day1++)
{
    $option = array('day' => $day1)
    $train = $train_xpath->query('//li/div/div[contains(@class, "smallFont farelist")]');
    if($train->length > 0)
    {
        foreach($train as $f) 
        {
            $time_s =  $train_xpath->evaluate('string(./div[@class="train-time"]/text()[1])', $f);
            $time_e =  $train_xpath->evaluate('string(./div[@class="train-time"]/text()[2])', $f);
            $fare = $train_xpath->evaluate('string(./div[@class="train-info"]/div/div[@class="total-price"])', $f);
            $option["value"][]=  array('flight_no' => $train_xpath->evaluate('string(./div[@class="train-no"])', $f),
                                                         'departure_time' => "$time_s ",
                                                         'arrival_time' => "$time_e ",
                                                         'price' => $fare );

                        }
    }
    $train_list['option'][] = $option;
}

for（$day1=$day；$day1$day1）
$train=$train_xpath->query（'//li/div/div[contains（@class，“smallFont-farelist”）]）；
如果（$train->length>0）
{
foreach（$f列）
{
$time\u s=$train\u xpath->evaluate（$string（./div[@class=“train time”]]/text（）[1]），$f）；
$time\u e=$train\u xpath->evaluate（$string（./div[@class=“train time”]/text（）[2]），$f）；
$fare=$train_xpath->evaluate（$string（./div[@class=“train info”]/div/div[@class=“total price”]），$f）；
$option[“value”][]=array（$flight\u no'=>$train\u xpath->evaluate（$string（./div[@class=“train no”]），$f），
“出发时间”=>“$time”，
“到达时间”=>“$time\u e”，
“价格”=>美元票价）；
}
}
$train_list['option'][]=$option；
}

希望它有帮助