使用json_encode()时删除数组索引引用 [英] Removing array index reference when using json_encode()
问题描述
我已经使用jQuery的datepicker
制作了一个小型应用程序.我正在从如下所示的JSON文件中为其设置不可用的日期:
I have made a small application using jQuery's datepicker
. I am setting unavailable dates to it from a JSON file which looks like this:
{ "dates": ["2013-12-11", "2013-12-10", "2013-12-07", "2013-12-04"] }
我想检查给出的日期是否已经在此列表中,如果有,请删除它.我当前的代码如下:
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:
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);
}
}
我的问题是,在我再次对数组进行编码后,它看起来像这样:
My problem here is that after I encode the array again, it looks like this:
{ "dates": ["1":"2013-12-11", "2":"2013-12-10", "3":"2013-12-07", "4":"2013-12-04"] }
有没有一种方法可以在JSON文件中找到日期匹配并将其删除,而在编码后不会出现键?
Is there a way to find the date match in the JSON file and remove it, without the keys appearing after the encode?
推荐答案
使用 array_values()
问题:
$arr['dates'] = array_values($arr['dates']);
//..
$arr = json_encode($arr);
为什么?因为您要取消设置数组的键而无需重新排序.因此,在此之后,将其保留在JSON中的唯一方法也将是编码键.但是,应用array_values()
之后,您将获得有序的密钥(从0
开始),可以对其进行正确编码,而无需包含密钥.
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.
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