Question

我正在使用基于API的此工具http://apps.evemilano.com/entities/。这是我得到的JSON文件。并非每个“itemListElement”都具有相同的详细程度。我想用“描述”计算所有ItemList。

{
  "@context": {
    "@vocab": "http://schema.org/",
    "goog": "http://schema.googleapis.com/",
    "EntitySearchResult": "goog:EntitySearchResult",
    "detailedDescription": "goog:detailedDescription",
    "resultScore": "goog:resultScore",
    "kg": "http://g.co/kg"
  },
  "@type": "ItemList",
  "itemListElement": [
    {
      "@type": "EntitySearchResult",
      "result": {
        "@id": "kg:/g/121gpq6x",
        "name": "Calogero Angelo Sacheli",
        "@type": [
          "Person",
          "Thing"
        ],
        "description": "Author"
      },
      "resultScore": 7.989742
    },
    {
      "@type": "EntitySearchResult",
      "result": {
        "@id": "kg:/m/0z3rcdq",
        "name": "Giovanni Sacheli",
        "@type": [
          "Thing",
          "Person"
        ],
        "url": "http://www.evemilano.com/"
      },
      "resultScore": 6.925036
    },
    {
      "@type": "EntitySearchResult",
      "result": {
        "@id": "kg:/m/07zy0l",
        "name": "Quarterback Princess",
        "@type": [
          "Movie",
          "Thing"
        ],
        "description": "1983 film",
        "detailedDescription": {
          "articleBody": "Quarterback Princess is a 1983 American made-for-television fact-based sports drama film by 20th Century Fox that chronicles the courage and determination of a teenage girl who struggles against sexism and fights to play on her high school football team. ",
          "url": "https://en.wikipedia.org/wiki/Quarterback_Princess",
          "license": "https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License"
        }
      },
      "resultScore": 0.945328
    }
  ]
}

并非每个实体都有一个描述，有3个实体，只有2个“描述”。我如何使用PHP只计算现有的“描述”？我需要打印“2”：）

谢谢。

Answer 1

您可以使用json_decode解码您的json有效负载：

$data = json_decode($json, true);

然后您可以迭代$data['itemListElement']并检查是否定义了$item['result']['description']：

$count = array_reduce($data['itemListElement'], function($count, $item) {
    return isset($item['result']['description']) ? ++$count : $count;
}, 0);

echo $count; // 2

如何只计算JSON中的现有元素

1 个答案: