Question

你好，我有一个json文件，即

{
   "data": [
      {
         "name": "The Lord of the Rings Trilogy (Official Page)",
         "category": "Movie"
      },
      {
         "name": "Snatch",
         "category": "Drama"
      },
      {
         "name": "The Social Network Movie",
         "category": "Movie"
      },
      {
         "name": "Scarface\u2122",
         "category": "Movie"
      }
  ]
}

我想在php中解析这个文件并获取我的php代码所有类别的值

<?php
error_reporting(E_ALL);
ini_set('display_errors', true);
$string = file_get_contents("test.json");
$json_a=json_decode($string,true);
foreach ($json_a as $category_name => $category) {
    echo $category['category'];
}?>

但我收到此错误

Notice: Undefined index: category in /var/www/json app/test.php on line 7

该怎样才能获得该文件中的类别模式（模式是比任何其他模式更频繁重复的数字），即在此示例中“电影”是列表的模式。

Answer 1

var_dump($json_a);

在json_decode之后，您会看到该数组嵌套在data中，所以

foreach ($json_a['data'] as $category_name => $category) {
    echo $category['category'];
}

<强> UPD

$string = '{
   "data": [
      {
         "name": "The Lord of the Rings Trilogy (Official Page)",
         "category": "Drama"
      },
      {
         "name": "Snatch",
         "category": "Movie"
      },
      {
         "name": "The Social Network Movie",
         "category": "Movie"
      },
      {
         "name": "Scarface\u2122",
         "category": "Movie"
      }
  ]
}';
$json_a=json_decode($string,true);

$categories = array();
foreach ($json_a['data'] as $category_name => $category) {
    $categories[] = $category['category'];
}

$categories_cnt = array_count_values($categories);
arsort($categories_cnt);

$categories_titles = array_keys($categories_cnt);

$most_frequent_word = reset($categories_titles);

var_dump($most_frequent_word);

如何在php中解析这个json

1 个答案: