用 PHP 解析 JSON
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【中文标题】用 PHP 解析 JSON【英文标题】：Parsing JSON with PHP 【发布时间】：2011-10-21 07:41:03 【问题描述】：我正在尝试从 Google 的 Shopping API 中提取数据。我能够成功下载数据，但我无法用 php 解析它。我仍在学习，但我似乎遇到了多维数组的问题。我使用$json = json_decode($data); 捕获JSON。
下面只是呼应了外层数组，但我无法从内层数组中拉取：
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"
]
]
【问题讨论】：
【参考方案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，您将返回一个数组。然后，您可以执行以下操作：
echo '<pre>';
print_r($json);
exit;
这将使您了解数据的数组结构以及如何访问所需的信息。例如，要提取每个项目的标题、品牌和描述，您需要执行以下操作：
foreach($json['items'] as $item)
echo 'Title: ' . $item['product']['title'] . '<br />';
echo 'Brand: ' . $item['product']['brand'] . '<br />';
echo 'Description: ' . $item['product']['description'] . '<br />';
为了获得可用性，再次使用 print_r() 转储数组并找出从数组中访问它的最佳方式。
【讨论】：
【参考方案2】：您的 JSON 是数组和对象的混合体。所以数组表示法不适用于所有项目。 例如，要查找品牌用途：
foreach ($json->items as $item)
var_dump($item->product->brand);
Codepad exampleJSON specification
【讨论】：
【参考方案3】：我们可以像这样解析JSON Array，
<?php
$json = "[\"name\":\"user1\",\"id\":\"940\",\"name\":\"user2\",\"id\":\"949\"]";
$dec = json_decode($json);
for($idx = 0; $idx < count($dec); $idx++)
$obj = (Array)$dec[$idx];
echo $obj["name"];
?>
类似 JSON 对象 像这样，
<?php
$json = "\"name\":\"user1\",\"id\":\"940\"";
$dec = (Array)json_decode($json);
echo $dec["name"];
?>
【讨论】：
【参考方案4】：您可以使用this json parser 以正确格式查看您的内容。
您可以使用此代码：
$json = json_decode($url,true);
//you can retrieve kind, tag, id by using
$kind = $json['kind'];
$id = $json['id'];
这里，items 本身会有一个数组，你可以使用它
$items[] = $json['items'];
// you can retrieve the data inside the kind array
$kind_arr = $json['items'][0][]['kind'];
//similarly you can parse all the data
【讨论】：
【参考方案5】：这不是 JSON 问题。你只需要遍历数组。一个简单的print_r($json); 将向您展示结构。
在您的情况下，您可能需要：
foreach ($json["items"] as $item)
foreach ($item["product"] as $key => $value)
echo $key . " : " . $value;
第一个 foreach 循环遍历项目列表。而第二个子数组访问 ["product"] 将使您获得所需的属性。
【讨论】：
我认为这样的事情会起作用，但我没有得到任何输出。我也试过： foreach ($json["items"] as $item) echo $item["title"] 。 "";我也没有得到任何输出。 盲测并不总是最好的方法。尝试其他建议，这将使您走上正确的道路。 默认情况下json_decode() 使用对象，而不是数组 - 所以它必须是 foreach ($json->items as $item)。您也可以使用$json = json_deocode($data, true) 来获取关联数组。请参阅php.net/json_decode 了解更多信息。【参考方案6】：
$json = ' "a1": "field1":"name1", "field2":age1, "field3":"country1"
,
"a2": "field1":"name2", "field2":age2, "field3":"country2" ,
"a3": "field1":"name3", "field2":age3, "field3":"country3" ';
$Array = json_decode($json, true);
foreach ($Array as $key => $value)
echo " $key ";
foreach ($value as $k => $val)
echo "$k | $val <br />";
【讨论】：
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