多维JSON数组到多〜php数组不起作用

Question

我是 JavaScript 和 PHP 的新手。我已经阅读了多个堆栈以获得答案，但我的 JSON 字符串有点不同。如果你问我，其实很简单。

字符串如下：

[[{"height":"444","width":"444","picture":"/image/data/122.jpg","x":0,"y":0,"currentheight":"444"},{"height":"444","width":"444","picture":"/image/data/122.jpg","y":"444","x":0,"currentheight":888},{"height":"223","width":"444","picture":"/image/data/122.jpg","y":888,"x":0,"currentheight":1111}],[{"height":"223","width":"444","picture":"/image/data/122.jpg","y":0,"x":444,"currentheight":"223"},{"height":"223","width":"444","picture":"/image/data/122.jpg","y":"223","x":444,"currentheight":446}]

现在我正在尝试使用json_decode($jsonstring, true) 对其进行解码，但是当我通过它的索引调用它时它只是没有得到一个值。一旦我尝试使用echo $jsonstring[0] 获取数据，我就会得到[ 作为结果。 $jsonstring[0]['width'] 甚至不返回任何内容。

是我说错了还是别的什么？

Answer 1

将']'添加到字符串后：

$ cat a.php
<?php
$a='[[{"height":"444","width":"444","picture":"/image/data/122.jpg","x":0,"y":0,"currentheight":"444"},{"height":"444","width":"444","picture":"/image/data/122.jpg","y":"444","x":0,"currentheight":888},{"height":"223","width":"444","picture":"/image/data/122.jpg","y":888,"x":0,"currentheight":1111}],[{"height":"223","width":"444","picture":"/image/data/122.jpg","y":0,"x":444,"currentheight":"223"},{"height":"223","width":"444","picture":"/image/data/122.jpg","y":"223","x":444,"currentheight":446}]]';
print_r(json_decode($a, true));
?>
$ php a.php
Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [height] => 444
                    [width] => 444
                    [picture] => /image/data/122.jpg
                    [x] => 0
                    [y] => 0
                    [currentheight] => 444
                )

            [1] => Array
                (
                    [height] => 444
                    [width] => 444
                    [picture] => /image/data/122.jpg
                    [y] => 444
                    [x] => 0
                    [currentheight] => 888
                )

            [2] => Array
                (
                    [height] => 223
                    [width] => 444
                    [picture] => /image/data/122.jpg
                    [y] => 888
                    [x] => 0
                    [currentheight] => 1111
                )

        )

    [1] => Array
        (
            [0] => Array
                (
                    [height] => 223
                    [width] => 444
                    [picture] => /image/data/122.jpg
                    [y] => 0
                    [x] => 444
                    [currentheight] => 223
                )

            [1] => Array
                (
                    [height] => 223
                    [width] => 444
                    [picture] => /image/data/122.jpg
                    [y] => 223
                    [x] => 444
                    [currentheight] => 446
                )

        )

)

Answer 2

你可以使用

从字符串中解析 json

Var x=JSON.parse(Expression) .

现在您可以使用 x 变量访问 JSON 对象了。