如何使用 PHP 循环遍历 JSON 数组

Posted 2023-02-24

【中文标题】如何使用 PHP 循环遍历 JSON 数组

【英文标题】：How to loop through JSON array using PHP

【发布时间】：2013-03-14 11:24:16

【问题描述】：

我的 php 代码：

$obj = json_decode($data);
print $obj->'name';

虽然它适用于非数组，但我一生都无法弄清楚如何打印“评论”数组中的所有值。

我想做的是遍历这个响应，可能使用 forreach()，生成一个列表，其中包含响应中每个评论的评分和摘录。

非常感谢任何指导/方向..

下面是我正在使用的 JSON。 （这是来自 Yelp API 的响应）。

    "is_claimed": true,
    "rating": 4.5,
    "mobile_url": "http://m.yelp.com/biz/economy-paint-and-collision-riverside",
    "rating_img_url": "http://s3-media2.ak.yelpcdn.com/assets/2/www/img/99493c12711e/ico/stars/v1/stars_4_half.png",
    "review_count": 19,
    "name": "Economy Paint & Collision",
    "snippet_image_url": "http://s3-media3.ak.yelpcdn.com/photo/ZOzoahw0Go_DEPLvxCaP_Q/ms.jpg",
    "rating_img_url_small": "http://s3-media2.ak.yelpcdn.com/assets/2/www/img/a5221e66bc70/ico/stars/v1/stars_small_4_half.png",
    "url": "http://www.yelp.com/biz/economy-paint-and-collision-riverside",
    "reviews": [
        
            "rating": 3,
            "excerpt": "The Good:\nDennis quoted me a price over the phone about 1 month before I took my wifes 2010 Escalade in for repairs and when I took it in he gave me the...",
            "time_created": 1357010247,
            "rating_image_url": "http://s3-media3.ak.yelpcdn.com/assets/2/www/img/34bc8086841c/ico/stars/v1/stars_3.png",
            "rating_image_small_url": "http://s3-media3.ak.yelpcdn.com/assets/2/www/img/902abeed0983/ico/stars/v1/stars_small_3.png",
            "user": 
                "image_url": "http://s3-media3.ak.yelpcdn.com/photo/mIsU7ugYd88lLA-XL2q1Cg/ms.jpg",
                "id": "V9MDZvEBv-tBTF4YIoc7mg",
                "name": "Sydney H."
            ,
            "rating_image_large_url": "http://s3-media1.ak.yelpcdn.com/assets/2/www/img/e8b5b79d37ed/ico/stars/v1/stars_large_3.png",
            "id": "HfOhzLIlJoUKSKU8euclqA"
        ,
        
            "rating": 5,
            "excerpt": "Dennis and his team did an amazing job on the roof of my fiancee's 2002 Acura RSX after years of living by the beach in San Francisco had mostly rusted...",
            "time_created": 1354741952,
            "rating_image_url": "http://s3-media1.ak.yelpcdn.com/assets/2/www/img/f1def11e4e79/ico/stars/v1/stars_5.png",
            "rating_image_small_url": "http://s3-media1.ak.yelpcdn.com/assets/2/www/img/c7623205d5cd/ico/stars/v1/stars_small_5.png",
            "user": 
                "image_url": "http://s3-media3.ak.yelpcdn.com/photo/ZOzoahw0Go_DEPLvxCaP_Q/ms.jpg",
                "id": "kOqCnCjYn0EbAhtH1tfjcw",
                "name": "Jason H."
            ,
            "rating_image_large_url": "http://s3-media3.ak.yelpcdn.com/assets/2/www/img/22affc4e6c38/ico/stars/v1/stars_large_5.png",
            "id": "YzZg1LX6zeRaurq9tYUcMw"
        ,
        
            "rating": 5,
            "excerpt": "It's been a year since I had my car painted here, and I gotta say: It still looks just as good as it did when I first picked it up. You would never know...",
            "time_created": 1361043626,
            "rating_image_url": "http://s3-media1.ak.yelpcdn.com/assets/2/www/img/f1def11e4e79/ico/stars/v1/stars_5.png",
            "rating_image_small_url": "http://s3-media1.ak.yelpcdn.com/assets/2/www/img/c7623205d5cd/ico/stars/v1/stars_small_5.png",
            "user": 
                "image_url": "http://s3-media1.ak.yelpcdn.com/photo/58coTtu1x5riHSgFEAQsfw/ms.jpg",
                "id": "kVrW3138d5VL-AZ97wFF4A",
                "name": "Jeanne M."
            ,
            "rating_image_large_url": "http://s3-media3.ak.yelpcdn.com/assets/2/www/img/22affc4e6c38/ico/stars/v1/stars_large_5.png",
            "id": "r5WtlQVMXiIMBR6S3N7RZw"
        
    ],
    "phone": "9517870227",
    "snippet_text": "Dennis and his team did an amazing job on the roof of my fiancee's 2002 Acura RSX after years of living by the beach in San Francisco had mostly rusted...",
    "image_url": "http://s3-media3.ak.yelpcdn.com/bphoto/kodoEcmgHRG61pPaWRndbw/ms.jpg",
    "categories": [
        [
            "Body Shops",
            "bodyshops"
        ],
        [
            "Auto Repair",
            "autorepair"
        ]
    ],
    "display_phone": "[phone]",
    "rating_img_url_large": "http://s3-media4.ak.yelpcdn.com/assets/2/www/img/9f83790ff7f6/ico/stars/v1/stars_large_4_half.png",
    "id": "economy-paint-and-collision-riverside",
    "is_closed": false,
    "location": 
        "city": "Riverside",
        "display_address": [
            "2548 Rubidoux Blvd",
            "Riverside, CA 92509"
        ],
        "geo_accuracy": 8,
        "postal_code": "92509",
        "country_code": "US",
        "address": [
            "2548 Rubidoux Blvd"
        ],
        "coordinate": 
            "latitude": 34.0132437,
            "longitude": -117.3923804
        ,
        "state_code": "CA"
    

【参考方案1】：

您可能遇到了麻烦，因为 reviews 是一个数组，而您正试图以 JSON 对象的形式访问它。

$obj = json_decode($data, TRUE);
for($i=0; $i<count($obj['reviews']); $i++) 
    echo "Rating is " . $obj['reviews'][$i]["rating"] . " and the excerpt is " . $obj['reviews'][$i]["excerpt"] . "<BR>";

【讨论】：

你如何让数据中的东西降低，比如用户“image_url”？

【参考方案2】：

我不确定你到底想要什么，但我想你现在想打印它只是为了调试。您可以尝试使用print_r($obj); 和var_dump($obj); - 他们必须打印一些东西，尤其是var_dump()。 当您看到数据时，您可以轻松地稍微编辑函数，例如print_r($obj->reviews) 或print_r($obj['reviews'])，具体取决于$obj 是对象还是数组。

【讨论】：

感谢您的回复，我要做的是简单地打印/回显评论数组中所有实体的评级和摘录。我不知道如何单独打印/回显这些数据，没有其他一切

【参考方案3】：

您可以使用 var_dump 或 print_r。

<?php 
$decodedJSON = json_decode($jsonData);

// Put everyting to the screen with var_dump;
var_dump($decodedJSON);

// With print_r ( useful for arrays );
print_r($decodedJSON);

// List just review ratings with foreach;
foreach($decodedJSON['reviews'] as $review)
    echo $review['rating'];

?>

【参考方案4】：

这里使用对象示例（阅读评论...raiting）：

$jsonObject = json_decode($data);
foreach ($jsonObject->reviews as $data) 
    echo $data->rating;