使用 PHP 解析 JSON

php arrays json

2022-08-30 19:36:35

我正在尝试从Google的购物API中提取数据。我能够成功下载数据，但我在使用PHP解析数据时遇到问题。我还在学习，但我似乎遇到了多维数组的问题。我用捕获 JSON 与 .$json = json_decode($data);

以下内容只是回显外部数组，但我无法从内部数组中提取：

foreach($json as $key => $value) {
  echo $key . " : " . $value;
}

如果我想获取每个产品的“标题”，“描述”，“品牌”和“可用性”，我将如何解析它？

{
 "kind": "shopping#products",
 "etag": "\"T9uPnY2MZMB71TDpKXXZdr3yWX4/qtJ5vmpftFWNfijyLD9ti2Xpj-w\"",
 "id": "tag:google.com,2010:shopping/products",
 "selfLink": "https://www.googleapis.com/shopping/search/v1/public/products?country\u003dus&q\u003dsony&maxResults\u003d3&startIndex\u003d2",
 "nextLink": "https://www.googleapis.com/shopping/search/v1/public/products?country\u003dus&q\u003dsony&maxResults\u003d3&startIndex\u003d5",
 "previousLink": "https://www.googleapis.com/shopping/search/v1/public/products?country\u003dus&q\u003dsony&maxResults\u003d3&startIndex\u003d1",
 "totalItems": 633694,
 "startIndex": 2,
 "itemsPerPage": 3,
 "currentItemCount": 3,
 "items": [
  {
   "kind": "shopping#product",
   "id": "tag:google.com,2010:shopping/products/1161353/11882813508247586172",
   "selfLink": "https://www.googleapis.com/shopping/search/v1/public/products/1161353/gid/11882813508247586172",
   "product": {
    "googleId": "11882813508247586172",
    "author": {
     "name": "Buy.com",
     "accountId": "1161353"
    },
    "creationTime": "2011-04-24T05:13:38.000Z",
    "modificationTime": "2011-08-05T17:45:24.000Z",
    "country": "US",
    "language": "en",
    "title": "Sony BRAVIA KDL-46EX720 46 inch 3D LED HDTV 1080p 120Hz",
    "description": "Entertainment lovers the slim Sony EX720-Series LED HDTV is for you. See precise motion detail plus watch your favorite 2D or 3D entertainment in clear, vivid Full HD 1080p picture quality with incredible contrast. You can even connect to the internet and access a great selection of online entertainment with Netflix , Hulu Plus , Pandora , Qriocity and more - there s always something on. Plus video chat with friends and family when you Skype on the big screen.",
    "link": "http://clickfrom.buy.com/default.asp?adid\u003d17902&sURL\u003dhttp%3A%2F%2Fwww.buy.com%2Fprod%2Fsony-bravia-kdl-46ex720-46-3d-led-hdtv-1080p-120hz%2Fq%2Fsellerid%2F10004001%2Floc%2F111%2F219891693.html",
    "brand": "Sony",
    "condition": "new",
    "gtin": "00027242817081",
    "gtins": [
     "00027242817081"
    ],
    "inventories": [
     {
      "channel": "online",
      "availability": "inStock",
      "price": 1348.0,
      "currency": "USD"
     }
    ],
    "images": [
     {
      "link": "http://ak.buy.com/PI/0/1000/219891693.jpg"
     }
    ]
   }
  },
  {
   "kind": "shopping#product",
   "id": "tag:google.com,2010:shopping/products/7827/1976288072671326122",
   "selfLink": "https://www.googleapis.com/shopping/search/v1/public/products/7827/gid/1976288072671326122",
   "product": {
    "googleId": "1976288072671326122",
    "author": {
     "name": "Dell",
     "accountId": "7827"
    },
    "creationTime": "2011-06-08T15:11:49.000Z",
    "modificationTime": "2011-08-05T15:04:13.000Z",
    "country": "US",
    "language": "en",
    "title": "Sony Bravia 55\" KDL55EX500 1080p 120Hz LCD HDTV",
    "description": "Enjoy breathtaking viewing experience with Bravia 55-inch KDL55EX500 1080p LCD HDTV from Sony®. This LCD TV features Motionflow™ 120 Hz Technology that allows you to experience smooth motion detail and clarity which delivers a crisp, fluid and realistic viewing skill during fast-action scenes. Additionally, the incorporated LightSensor™ Technology automatically increases or decreases the level of brightness of your TV's backlight based on a room's lighting conditions. Moreover, the BRAVIA Engine™ 2 fully processor lets you enjoy sharp, vibrant, life-like images while optimizing color, contrast and significantly reducing noise. Besides this, get a natural looking picture with an Ambient Sensor. Plus, you can also share your photos and music on the big screen by simply connecting your digital camera, USB-enabled MP3 player, or USB storage device directly to your HDTV's USB input. With all these features loaded into a single television the Bravia EX500 is an ideal choice to complement your digital lifestyle.var wcCpi\u003d\"A3477150\";",
    "link": "http://lt.dell.com/lt/lt.aspx?CID\u003d27530&LID\u003d627063&DGC\u003dSS&DGSeg\u003dDHS&DURL\u003dhttp://accessories.us.dell.com/sna/productdetail.aspx?c\u003dus%26l\u003den%26s\u003ddhs%26cs\u003d19%26sku\u003dA3477150%26CAWELAID\u003d469727188",
    "brand": "Sony",
    "condition": "new",
    "gtin": "00027242784932",
    "gtins": [
     "00027242784932"
    ],
    "inventories": [
     {
      "channel": "online",
      "availability": "inStock",
      "price": 1348.0,
      "currency": "USD"
     }
    ],
    "images": [
     {
      "link": "http://accessories.us.dell.com/sna/images/products/large/A3477150temp.jpg"
     }
    ]
   }
  },
  {
   "kind": "shopping#product",
   "id": "tag:google.com,2010:shopping/products/1113342/9429326904502109794",
   "selfLink": "https://www.googleapis.com/shopping/search/v1/public/products/1113342/gid/9429326904502109794",
   "product": {
    "googleId": "9429326904502109794",
    "author": {
     "name": "Walmart",
     "accountId": "1113342"
    },
    "creationTime": "2011-03-26T23:58:51.000Z",
    "modificationTime": "2011-08-04T19:42:49.000Z",
    "country": "US",
    "language": "en",
    "title": "Sony Bravia 32\" Class 3D LED-LCD 1080p 240Hz HDTV,1.68\" ultra-Slim,",
    "description": "Note: You must have a source of HD programming in order to take full advantage of the Sony Bravia 32\" Class 3D 1080p LED HDTV. Contact your local cable or satellite TV provider for details on how to upgrade.Visit the Sony Brand Shop for 3D glasses, other 3D HDTVs and more.Sony Bravia 32\" Class 3D 1080p LED HDTV 240Hz, KDL-32EX720:See It All In 3D: Engineered with advanced technologies, the EX720 Series is more than a fully-loaded HDTV with 3D. Once you slide on the active shutter glasses (sold separately), the on-screen image is precisely synchronized and delivered with the Full HD image intact for an immersive entertainment viewing experience with maximum resolution and superb clarity.Slim Design, Stunning Picture: Experience the next level of picture quality and contrast with Edge LED Backlight technology. U",
    "link": "http://www.walmart.com/ip/Sony-KDL-32EX720/15780230?sourceid\u003d1500000000000003142050&ci_src\u003d14110944&ci_sku\u003d15780230",
    "brand": "Sony",
    "condition": "new",
    "gtin": "00027242817135",
    "gtins": [
     "00027242817135"
    ],
    "inventories": [
     {
      "channel": "online",
      "availability": "inStock",
      "price": 898.0,
      "currency": "USD"
     }
    ],
    "images": [
     {
      "link": "http://i.walmartimages.com/i/p/00/02/72/42/81/0002724281713_500X500.jpg"
     }
    ]
   }
  }
 ]
}

答案 1

如果我是你，我会将JSON解析为数组而不是对象。这可以通过执行以下操作来完成：

$json = json_decode($data, true);

通过在json_decode中包含值为 true 的第二个参数，可以得到一个数组。然后，您可以执行如下操作：

echo '<pre>';
print_r($json);
exit;

这将使您了解数据的数组结构以及如何访问所需的信息。例如，要提取每个项目的标题、品牌和说明，您需要执行以下操作：

foreach($json['items'] as $item) {
    echo 'Title: ' . $item['product']['title'] . '<br />';
    echo 'Brand: ' . $item['product']['brand'] . '<br />';
    echo 'Description: ' . $item['product']['description'] . '<br />';
}

若要获取可用性，请使用 print_r（）再次转储数组，并找出从数组访问它的最佳方法。

答案 2

JSON 是数组和对象的混合体。因此，数组表示法不适用于所有项目。例如，要查找品牌用途：

foreach ($json->items as $item) {
   var_dump($item->product->brand);
}

代码板示例
 JSON 规范