如何循环访问多维数据和关联数组中的各种元素？PHP,JSON或XML

Question

我正在通过API(zotero.org)检索书目数据,它类似于底部的样本(只是更复杂的样本 - 样本被打字).

我想检索一个或多个记录并在页面上显示某些值.例如,我想循环遍历每个顶级记录,并以精确格式化的引文打印数据.暂时忽略正确的围兜样式,假设我想为每个返回的记录打印出以下内容:

author1名称,author2名称,文章标题,出版物标题,密钥

这与代码不匹配,因为我显然错误地引用了键值对,并且只会弄乱它.

如果我请求JSON格式,下面的内容就像数据一样,尽管我可以请求XML数据.我不挑剔; 我尝试过使用每一个都没有运气.

[
  {
    "key": "123456",
    "state": 100,
    "data": {
      "articleTitle": "Wombat coprogenetics: enumerating a common wombat population by microsatellite analysis of faecal DNA",
      "authors": [
        {
          "firstName": "Sam C.",
          "lastName": "Smith"
        },
        {
          "firstName": "Maxine P.",
          "lastName": "Jones"
        }
      ],
      "pubTitle": "Australian Journal of Zoology",
      "tags": [
         {
          "tag": "scary"
        },
        {
          "tag": "secret rulers of the world"
        }
      ]
   }
 },
 {
   "key": "001122",
   "state": 100,
   "data": {
     "articleTitle": "WOMBAT and WOMBAT-PK: Bioactivity Databases for Lead and Drug Discovery",
     "authors": [
        {
          "firstName": "Marius",
          "lastName": "Damstra"
        }
      ],
      "pubTitle": "Chemical Biology: From Small Molecules to Systems Biology",
      "tags": [
        {
          "tag": "Wrong Wombat"
        }
      ]
    }
  }
]

如果括号,逗号等中有错误,这只是我的例子中的一个错字而不是我的问题的原因.

Answer 1

将您的json解码为数组并将其作为流动的任何数组进行迭代:

$json_decoded= json_decode($json,true);

$tab="\t";

foreach ($json_decoded as $key => $val) {
    echo "Article ".$val["key"]."\n" ;
    echo $tab."Authors :\n";
    foreach ($val["data"]["authors"] as $key => $author){
        echo $tab.$tab. ($key+1) ." - ".$author["firstName"]. " ".$author["lastName"]."\n";
    } 

    echo $tab."Article Title: ".$val["data"]["articleTitle"] ."\n";
    echo $tab."Publication Title: ".$val["data"]["pubTitle"] ."\n";
    echo $tab."Key: ".$val["key"]."\n";
}

在键盘上运行

并且你可以使用与流动相同的xml方法:

$xml = simplexml_load_string($xmlstring);
$json = json_encode($xml);
$json_decoded = json_decode($json,TRUE);
//the rest is same

对于xml,您可以使用SimpleXml的函数或DOMDocument类

小费

了解数据的结构,它在转换为数组用于var_dump($your_decoded_json)debuging 后返回给你