在php中使用json_encode时删除数组索引引用

I have made a small application using jQuery datepicker. I am setting unavailable dates to it from json file which looks like this:

我使用jQuery datepicker做了一个小应用程序。我从json文件中设置了不可用日期，如下所示:

{"dates":["2013-12-11","2013-12-10","2013-12-07","2013-12-04"]}.

I would like to check if a date given is already in this list and remove it if so. My current code looks like this:

我想检查一个给定的日期是否已经在这个列表中，如果是，我想删除它。我当前的代码是这样的:

if(isset($_GET['date'])) //the date given
{
    if($_GET['roomType']==2)
    {
        $myFile = "bookedDates2.json";
        $date = $_GET['date'];
        if(file_exists($myFile))
        {
            $arr = json_decode(file_get_contents($myFile),true);
            if (!in_array($date, $arr['dates']))
            {
            $arr['dates'][] = $_GET['date'];   //adds the date into the file if it is not there already
            }
            else
            {

                foreach ($arr['dates'] as $key => $value)
                {
                    if (in_array($date, $arr['dates']))
                    {
                        unset($arr['dates'][$key]);
                        array_values($arr['dates']);

                    }
                }

            }
        }
            $arr = json_encode($arr);
            file_put_contents($myFile,$arr);

    }

My problem here is that after I encode the array again, it looks like this

我的问题是，当我再次对数组进行编码后，它看起来是这样的。

{"dates":["1":"2013-12-11","2":"2013-12-10","3":"2013-12-07","4":"2013-12-04"]}

Is there a way to find the date match in the json file and remove it, w/o the keys appearing after the encode?

是否有一种方法可以找到json文件中的日期匹配项并将其删除，将在编码后出现的键删除?

Any help is appreciated.

任何帮助都是感激。

2 个解决方案

#1

Use array_values() for your issue:

使用array_values()解决您的问题:

$arr['dates'] = array_values($arr['dates']);
//..
$arr = json_encode($arr);

Why? Because you're unsetting array's key without re-ordering it. So after this the only way to keep that in JSON will be encode keys too. After applying array_values(), however, you'll get ordered keys (starting from 0) which can be encoded properly without including keys.

为什么?因为你在没有重新排序的情况下解除了数组的键。在此之后，保持JSON格式的唯一方法就是对键进行编码。然而，在应用array_values()之后，您将获得有序键(从0开始)，可以在不包含键的情况下正确编码这些键。

#2

You are ignoring the return value of array_values in your existing attempt to reindex the array. Correct is

在重新索引数组的现有尝试中，您将忽略array_values的返回值。正确的是

$arr['dates'] = array_values($arr['dates']);

The reindexing should also be moved outside the foreach loop, there is no point in reindexing multiple times.

驯鹿化也应该移到foreach循环之外，多次驯鹿化是没有意义的。

#1