将JSON数组中的值分配给PHP中的变量

Question

我有一个查询，在进行JSON编码时，print_r()看起来像这样：

Array
(    
    [response] => Array
        (
            [numFound] => 2392
            [start] => 0
            [maxScore] => 1
            [docs] => Array
                (
                )

        )

    [stats] => Array
        (
            [stats_fields] => Array
                (
                    [q_one] => Array
                        (
                            [min] => 0.0059
                            [max] => 6.0095
                            [count] => 2392
                            [missing] => 0
                            [sum] => 53.9131
                            [sumOfSquares] => 48.16448107
                            [mean] => 0.022538921404682
                            [stddev] => 0.14012800795752
                            [facets] => Array
                                (
                                )

                        )

                    [q_two] => Array
                        (
                            [min] => 0
                            [max] => 0.0075
                            [count] => 2392
                            [missing] => 0
                            [sum] => 17.67
                            [sumOfSquares] => 0.132525
                            [mean] => 0.0073871237458194
                            [stddev] => 0.00091333432809989
                            [facets] => Array
                                (
                                )

                        )

                    [q_three] => Array
                        (
                            [min] => 0
                            [max] => 0.065
                            [count] => 2392
                            [missing] => 0
                            [sum] => 153.14
                            [sumOfSquares] => 9.9541
                            [mean] => 0.064021739130435
                            [stddev] => 0.0079155641768643
                            [facets] => Array
                                (
                                )

                        )

                )

        )

)

在stats >> stats_fields内我想写一个foreach循环来捕获每个标题的名称：q_one，q_two和q_three，但是我我不知道该怎么做。

我可以捕获这3个'标题'中的每个元素，因为它们的名称是静态的（例如 - 每个元素都有min和max元素）

foreach ($json['stats']['stats_fields'] as $j) {
  echo $j['min']
}

但我不确定如何获得标题名称......

Answer 1

使用array_keys()：

将它们放入数组中

$headers = array_keys($json['stats']['stats_fields']);

如果您需要使用$key => $value语法，请将它们放入循环中：

foreach ($json['stats']['stats_fields'] as $key => $j) {
  echo $key;
  echo $j['min'];
}