在 PHP cookie 中存储和检索数组 [英] Storing and retrieving an array in a PHP cookie

问题描述

我想从一些虚拟"索引卡中存储一些数据.每张卡片都有正面和背面，用户可以存放多张卡片.每一方都会有数据.

I ----------------- I I CARD 1 FRONT I -----------------II --------------- I I CARD 1 BACK I -----------------II ----------------- I I CARD 2 FRONT I -----------------II --------------- I I CARD 2 BACK I -----------------I

好吧，我的图表有点乱.但是你会收到消息.:)

从上图中想象一下.我想将每张卡片的数据(正面和背面)存储在 cookie 中，作为一个数组(也许)，然后能够将每个值拉回并在适用的地方(在不同的页面上)插入.

同时请记住，用户可以制作任意数量的卡片.我不能使用 POST 或 GET 函数.数组位是有争议的，如果您能想到一种更简单的方法将这些数据存储在 cookie 中，请告诉我.请注意:不建议存储在数据库中，因为它对项目不方便.:)

解决方案

使用 json_encode/json_decode 来获取/设置 cookie 中的数组.

测试数组

$cardArray=array('CARD 1'=>array('FRONT I', 'BACK I'),'卡 2'=> 数组('前 2'，'后 2'));

转换并写入cookie

$json = json_encode($cardArray);setcookie('cards', $json);

保存的字符串看起来像这样

{"CARD 1":["FRONT I","BACK I"],"CARD 2":["FRONT 2","BACK 2"]}

取回饼干

$cookie = $_COOKIE['cards'];$cookie = stripslashes($cookie);$savedCardArray = json_decode($cookie, true);

显示恢复后的数组

echo '
';打印_r($savedCardArray);echo '</pre>';
输出
数组([卡片 1] =>大批([0] =>前我[1] =>返回我)[卡片 2] =>大批([0] =>前 2[1] =>返回 2))
<小时>
编辑
如果你对stripslashes感到疑惑，那是因为实际保存的字符串是
{\"CARD 1\":[\"FRONT I\",\"BACK I\"],\"CARD 2\":[\"FRONT 2\",\"BACK 2\"]}
setcookie 在引号前添加 \ 来转义它们.如果你不摆脱这些，json_decode 将会失败.
<小时>
编辑二 
向 cookie 添加一张新卡片
如上加载数组
$savedCardArray['CARD XX']=array('FRONT XX', 'BACK XX');
如上保存数组，但现在当然是$savedCardArray 而不是$cardArray.
I'm looking to store some data from some 'virtual' index cards. Each card has a front and a back, and the user can store multiple cards. Each side will have data on it.
I ----------------- I I CARD 1 FRONT I I------------------I
I --------------- I I CARD 1 BACK I I-----------------I
I ----------------- I I CARD 2 FRONT I I------------------I
I --------------- I I CARD 2 BACK I I-----------------I
OK, my diagrams got messed up a bit. But you get the message. :)

Imagine it from the diagrams above. I'd like to store each card's data (front and back) in a cookie, as an array (maybe), and then be able to pull each value back and insert it where applicable (on a different page).

At the same time, bear in mind that the user can make as many cards as they like. I can't use POST or GET functions. The array bit is debatable, if you can think of an easier way of storing this data in a cookie, let me know. Please note: don't suggest storing in a database, as it won't be convenient for the project. :)
解决方案
Use json_encode / json_decode to get / set arrays in cookies.

Test array
$cardArray=array(
    'CARD 1'=>array('FRONT I', 'BACK I'),
    'CARD 2'=>array('FRONT 2', 'BACK 2')
);
convert and write the cookie
$json = json_encode($cardArray);
setcookie('cards', $json);
the saved string looks like this
{"CARD 1":["FRONT I","BACK I"],"CARD 2":["FRONT 2","BACK 2"]}
get the cookie back
$cookie = $_COOKIE['cards'];
$cookie = stripslashes($cookie);
$savedCardArray = json_decode($cookie, true);
show the restored array
echo '<pre>';
print_r($savedCardArray);
echo '</pre>';
outputs
Array
(
    [CARD 1] => Array
        (
            [0] => FRONT I
            [1] => BACK I
        )

    [CARD 2] => Array
        (
            [0] => FRONT 2
            [1] => BACK 2
        )

)




Edit

If you wonder about stripslashes, it is because the string saved actually is
{\"CARD 1\":[\"FRONT I\",\"BACK I\"],\"CARD 2\":[\"FRONT 2\",\"BACK 2\"]}
setcookie adds \ before quoutes to escape them. If you not get rid of those, json_decode will fail.



Edit II  

To add a new card to the cookie

load the array as above
$savedCardArray['CARD XX']=array('FRONT XX', 'BACK XX');
save the array as above, but now of course $savedCardArray and not $cardArray.


                        
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