Question

我在尝试向现有JSON对象添加新键值对时遇到问题。我尝试过使用array_merge，array_push，array_replace ......都没有成功。

所需格式（博客案例研究）

{  
   "1":{  
      "id":"1",
      "name":"lew",
      "email":"test@hotmail.co.uk",
      "title":"lew",
      "description":"lew",
      "categories":[  
         "science"
      ],
      "image":"no_image"
   },
   "2":{  
      "2",
      "name":"lew",
      "email":"test@hotmail.co.uk",
      "title":"lew",
      "description":"lew",
      "categories":[  
         "science"
      ],
      "image":"no_image"
   }
}

这是我当前的代码（不是说如果JSON文件为空，我只需添加第一个元素，而不需要合并等。）

if ($data == null) {
        $post_array = array('id' => "1",'name' => $_POST['name'], 'email' => $_POST['email'], 'title' => $_POST['title'], 'description' => $_POST['description'], 'categories' => $_POST['categories'], 'image' => $imageFilePath);
        echo json_encode($post_array) . "<br>";
        $blog_entry = array("1" => $post_array);
        echo json_encode($blog_entry) . "<br>";
        file_put_contents('blogPosts.json', json_encode($blog_entry));
} else {
        $length_of_data = count($data);
        $new_id = (string)($length_of_data + 1);

        $post_array = array('id' => $new_id, 'name' => $_POST['name'], 'email' => $_POST['email'], 'title' => $_POST['title'], 'description' => $_POST['description'], 'categories' => $_POST['categories'], 'image' => $imageFilePath);
        $merged = array_push($data, array($new_id => $post_array));
        file_put_contents('blogPosts.json', json_encode($merged));
}

欢迎任何建议，谢谢

Answer 1

此代码可以使用，并且希望您似乎想要！

（这只是一个解决方案，不是优雅甚至我会做的事情......）

<?php
$data = file_get_contents('blogPosts.json');
$data = (empty($data)) ? null : json_decode($data, true);

if ($data == null) {
    $post_array = array('id' => "1", 'name' => $_POST['name'], 'email' => $_POST['email'], 'title' => $_POST['title'], 'description' => $_POST['description'], 'categories' => $_POST['categories'], 'image' => $imageFilePath);
    $blog_entry = array("1" => $post_array);
    file_put_contents('blogPosts.json', json_encode($blog_entry));
}
else {
    $post_array = array('id' => $new_id, 'name' => $_POST['name'], 'email' => $_POST['email'], 'title' => $_POST['title'], 'description' => $_POST['description'], 'categories' => $_POST['categories'], 'image' => $imageFilePath);
    $data[] = $post_array;
    file_put_contents('blogPosts.json', json_encode($data));
}

var_dump($data);

这将完全相同，代码更少......

<?php
$data = file_get_contents('blogPosts.json');
$data = (empty($data)) ? array() : json_decode($data, true);

$new_id = count($data) + 1;

$post_array = array('id' => $new_id, 'name' => $_POST['name'], 'email' => $_POST['email'], 'title' => $_POST['title'], 'description' => $_POST['description'], 'categories' => $_POST['categories'], 'image' => $imageFilePath);

$data[] = $post_array;
file_put_contents('blogPosts.json', json_encode($data));

var_dump($data);

（编辑，有错误......）

Answer 2

所以 - 你真的不需要＆＃34; key =＆gt;值＆＃34;对，你只想将数组追加到你的主阵列。

在给定代码的情况下，最简单的方法就是这样做（注意：用此替换整个 if / else语句）：

$new_id = count( (array)$data ) + 1;
$data[ $new_id ] = array('id' => $new_id, 'name' => $_POST['name'], 'email' => $_POST['email'], 'title' => $_POST['title'], 'description' => $_POST['description'], 'categories' => $_POST['categories'], 'image' => $imageFilePath);
file_put_contents( 'blogPosts.json', json_encode( $data ) );

PHP：向JSON对象添加新的键值对

2 个答案: