需要在数组中取数组值答案

【问题标题】：need to take the array value inside an array需要在数组中取数组值
【发布时间】：2020-07-18 08:30:57
【问题描述】：

我有一个数组作为查询的结果，并且该数组内部有一个关联数组。我需要选择有价值的产品，即我需要从这个结果中得到["176","143","60"]。请帮我搞定这个。

stdClass Object ( 
    [num_rows] => 1 
    [row] => Array ( 
        [setting] => {"name":"featured","product_name":"","product":["176","143","60"],"limit":"10","width":"200","height":"200","status":"1"} 
    ) 
    [rows] => Array ( 
        [0] => Array ( 
            [setting] => {"name":"featured","product_name":"","product":["176","143","60"],"limit":"10","width":"200",
"height":"200","status":"1"} 
        ) 
    ) 
)

【问题讨论】：

它返回一个stdClass，根据你获取SQL资源的方法，强制它返回一个关联数组，然后你就可以通过索引来获取它了。
顺便说一句，重新格式化您的示例以使其更具可读性。
setting 不像 JSON - 所以请阅读 stackoverflow.com/questions/29308898/…

标签： php arrays getvalue

【解决方案1】：

结果你没有得到数组。你得到 stdClass 这是一个对象。您必须访问其属性。该属性是一个数组，其中包含一个元素，该元素是一个 json 编码的字符串，因此您必须先对其进行解码，然后再访问您感兴趣的数组键。此外，您没有指定您感兴趣的产品数据（来自 row 或 rows 属性？可以有更多行吗？）。

https://www.php.net/manual/en/language.types.object.php

https://www.php.net/manual/en/function.json-decode.php

<?php

$data = new stdClass();
$data->num_rows = 1;
$data->row = [
  'setting' => '{"name":"featured","product_name":"","product":["176","143","60"],"limit":"10","width":"200","height":"200","status":"1"}',
];
$data->rows = [
  0 => [
    'setting' => '{"name":"featured","product_name":"","product":["176","143","60"],"limit":"10","width":"200","height":"200","status":"1"}'
  ]
];

// get product array from row
var_dump(json_decode($data->row['setting'])->product);

// get product array from first row of rows
var_dump(json_decode($data->rows[0]['setting'])->product);

// get product array from all rows
array_map(function(array $row) {
  var_dump(json_decode($row['setting'])->product);
}, $data->rows);

所有 3 个转储结果：

array(3) {
  [0]=>
  string(3) "176"
  [1]=>
  string(3) "143"
  [2]=>
  string(2) "60"
}

【讨论】：