在 php 中添加另一个项目到数组关联

Question

我在向关联数组添加新项目时遇到一些问题，

这就是我创建结构的方式：

$cpdata[$count] = array(
  'value' => $value->value,
  'images' => array(
    'color' => $value->color,
    'image' => $value->image,
  ),
);

这就是我输出 json 时的样子：

{
  "value": "BOX",
  "images": {
    "color": "white",
    "image": "white.png"
  }
}

但是我想添加更多项目到

images

这样的东西：

{
  "value": "BOX",
  "images": [
    {
        "color": "white",
        "image": "white.png"
    },
    {
      "color": "black",
      "image": "black.png"
    },
    {
      "color": "gray",
      "image": "gray.png"
    }
  ]
}

我尝试过

array_push

和

array_merge

但我无法得到它 我试过了

array_push($cpdata['images'][$count]['images'], 'color'=>'red', image' => 'red.png')

你能帮我一下吗？ 问候 马里奥

Answer 1

在 PHP 上下文中，您拥有的是 JSON 变量。如果这是一个字符串，您必须首先使用

json_decode($string);

对其进行解码

然后您可以设置一个对象，用图像变量填充它并将其作为数组写回

$json

对象，例如：

<?php
// example code

$json = <<<EOT
{
  "value": "BOX",
  "images": {
    "color": "white",
    "image": "white.png"
  }
}
EOT;

$json = json_decode($json);
$i = new stdClass;
$i->color = $json->images->color;
$i->image = $json->images->image;
$json->images = array($i);

之后你可以像这样推动它

$newimage = new stdClass;
$newimage->color = "foo";
$newimage->image = "bar";
$json->images[] = $newimage;

输出

print_r($json);

stdClass Object
(
    [value] => BOX
    [images] => Array
        (
            [0] => stdClass Object
                (
                    [color] => white
                    [image] => white.png
                )
            [1] => stdClass Object
                (
                    [color] => foo
                    [image] => bar
                )
        )
)

示例 https://www.tehplayground.com/oBS1SN1ze1DsVmIn

Answer 2

转换成json之前

$cpdata[$count] = array(
  'value' => $value->value,
  'images' => array(
    'color' => $value->color,
    'image' => $value->image,
  ),
);
// Cpdata array has $count which has `images` as an array and we want to push another element(array) into images array
array_push($cpdata[$count]['images'], ['color'=>'red', 'image' => 'red.png']);

Answer 3

向“images”数组添加更多项目，您应该将其初始化为数组，然后使用 [ ] 追加新项目。

$cpdata[$count]['images'][]

本质上是将一个新的关联数组附加到与

$count

数组中索引

$cpdata

处的元素关联的“图像”数组

// Assuming $value is an object with properties value, color, and image

$value = (object) array('value' => 'BOX', 'color' => 'white', 'image' => 'white.png');

$cpdata = array();
$count = 0;

$cpdata[$count] = array(
    'value' => $value->value,
    'images' => array(
        array('color' => $value->color, 'image' => $value->image)
    ),
);

// Adding more items to the "images" array
$cpdata[$count]['images'][] = array('color' => 'black', 'image' => 'black.png');
$cpdata[$count]['images'][] = array('color' => 'gray', 'image' => 'gray.png');

// Print the result as JSON
echo json_encode($cpdata, JSON_PRETTY_PRINT);

JSON_PRETTY_PRINT

是一个以人类可读的方式使用 JSON 输出的标志