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如何在PHP中使用json解码访问多维数组内的对象？

[英]How to access object inside multidimensional array with json decode in PHP?

 原文  2019-06-16 19:25:55  1   2    php/ arrays/ json/ undefined-index

问题描述

I'm struggling with accessing elements of arrays. 我正在努力访问数组的元素。 I'm sure it's easy but I always get undefined index errors. 我敢肯定这很容易，但是我总是会得到未定义的索引错误。

Display Array : 显示数组： 

// Get response
$synresponse = curl_exec($chs);
// Decode
$variants = json_decode($synresponse, true);

Returns : 返回值： 

{
    "code": 200,
    "result": {
        "sync_product": {
            "id": 118425517,
            "external_id": "5d02e1420b4007",
            "name": "Women's Crop Top",
            "variants": 4,
            "synced": 4
        },
        "sync_variants": [
            {
                "id": 1335801688,
                "external_id": "5d02e1420b4141",
                "sync_product_id": 118425517,
                "name": "Women's Crop Top - S",
                "synced": true,
                "variant_id": 8039,
                "retail_price": "22.50",
                "currency": "USD",
                "product": {
                    "variant_id": 8039,
                    "product_id": 224,
                    "image": "https://d1yg28hrivmbqm.cloudfront.net/products/224/8039_1550478004.jpg",
                    "name": "Los Angeles Apparel 2332 Fine Jersey Short Sleeve Cropped T-Shirt /w Tear Away Label (White / S)"
                },
                "files": [
                    {
                        "id": 120674338,
                        "type": "default",
                        "hash": "6238a66581153315488397a5788216b2",
                        "url": null,
                        "filename": "logo2.png",
                        "mime_type": "image/png",
                        "size": 163254,
                        "width": 1380,
                        "height": 1380,
                        "dpi": null,
                        "status": "ok",
                        "created": 1560465358,
                        "thumbnail_url": "https://d1yg28hrivmbqm.cloudfront.net/files/623/6238a66581153315488397a5788216b2_thumb.png",
                        "preview_url": "https://d1yg28hrivmbqm.cloudfront.net/files/623/6238a66581153315488397a5788216b2_preview.png",
                        "visible": true
                    },
                    {
                        "id": 120686478,
                        "type": "preview",
                        "hash": "fa1a4b2f561f28529f4230ba49eca1db",
                        "url": null,
                        "filename": "mockup-79b7c377.png",
                        "mime_type": "image/png",
                        "size": 113878,
                        "width": 600,
                        "height": 600,
                        "dpi": 43,
                        "status": "ok",
                        "created": 1560469826,
                        "thumbnail_url": "https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_thumb.png",
                        "preview_url": "https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_preview.png",
                        "visible": false
                    }
                ],
                "options": []
            },
            {
                "id": 1335801689,
                "external_id": "5d02e1420b41b9",
                "sync_product_id": 118425517,
                "name": "Women's Crop Top - M",
                "synced": true,
                "variant_id": 8040,
                "retail_price": "22.50",
                "currency": "USD",
                "product": {
                    "variant_id": 8040,
                    "product_id": 224,
                    "image": "https://d1yg28hrivmbqm.cloudfront.net/products/224/8040_1550478002.jpg",
                    "name": "Los Angeles Apparel 2332 Fine Jersey Short Sleeve Cropped T-Shirt /w Tear Away Label (White / M)"
                },
                "files": [
                    {
                        "id": 120674338,
                        "type": "default",
                        "hash": "6238a66581153315488397a5788216b2",
                        "url": null,
                        "filename": "logo2.png",
                        "mime_type": "image/png",
                        "size": 163254,
                        "width": 1380,
                        "height": 1380,
                        "dpi": null,
                        "status": "ok",
                        "created": 1560465358,
                        "thumbnail_url": "https://d1yg28hrivmbqm.cloudfront.net/files/623/6238a66581153315488397a5788216b2_thumb.png",
                        "preview_url": "https://d1yg28hrivmbqm.cloudfront.net/files/623/6238a66581153315488397a5788216b2_preview.png",
                        "visible": true
                    },
                    {
                        "id": 120686478,
                        "type": "preview",
                        "hash": "fa1a4b2f561f28529f4230ba49eca1db",
                        "url": null,
                        "filename": "mockup-79b7c377.png",
                        "mime_type": "image/png",
                        "size": 113878,
                        "width": 600,
                        "height": 600,
                        "dpi": 43,
                        "status": "ok",
                        "created": 1560469826,
                        "thumbnail_url": "https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_thumb.png",
                        "preview_url": "https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_preview.png",
                        "visible": false
                    }
                ],
                "options": []
            },
            {
                "id": 1335801690,
                "external_id": "5d02e1420b41f3",
                "sync_product_id": 118425517,
                "name": "Women's Crop Top - L",
                "synced": true,
                "variant_id": 8041,
                "retail_price": "22.50",
                "currency": "USD",
                "product": {
                    "variant_id": 8041,
                    "product_id": 224,
                    "image": "https://d1yg28hrivmbqm.cloudfront.net/products/224/8041_1550478000.jpg",
                    "name": "Los Angeles Apparel 2332 Fine Jersey Short Sleeve Cropped T-Shirt /w Tear Away Label (White / L)"
                },
                "files": [
                    {
                        "id": 120674338,
                        "type": "default",
                        "hash": "6238a66581153315488397a5788216b2",
                        "url": null,
                        "filename": "logo2.png",
                        "mime_type": "image/png",
                        "size": 163254,
                        "width": 1380,
                        "height": 1380,
                        "dpi": null,
                        "status": "ok",
                        "created": 1560465358,
                        "thumbnail_url": "https://d1yg28hrivmbqm.cloudfront.net/files/623/6238a66581153315488397a5788216b2_thumb.png",
                        "preview_url": "https://d1yg28hrivmbqm.cloudfront.net/files/623/6238a66581153315488397a5788216b2_preview.png",
                        "visible": true
                    },
                    {
                        "id": 120686478,
                        "type": "preview",
                        "hash": "fa1a4b2f561f28529f4230ba49eca1db",
                        "url": null,
                        "filename": "mockup-79b7c377.png",
                        "mime_type": "image/png",
                        "size": 113878,
                        "width": 600,
                        "height": 600,
                        "dpi": 43,
                        "status": "ok",
                        "created": 1560469826,
                        "thumbnail_url": "https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_thumb.png",
                        "preview_url": "https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_preview.png",
                        "visible": false
                    }
                ],
                "options": []
            },
            {
                "id": 1335801691,
                "external_id": "5d02e1420b4238",
                "sync_product_id": 118425517,
                "name": "Women's Crop Top - XL",
                "synced": true,
                "variant_id": 8042,
                "retail_price": "22.50",
                "currency": "USD",
                "product": {
                    "variant_id": 8042,
                    "product_id": 224,
                    "image": "https://d1yg28hrivmbqm.cloudfront.net/products/224/8042_1550478006.jpg",
                    "name": "Los Angeles Apparel 2332 Fine Jersey Short Sleeve Cropped T-Shirt /w Tear Away Label (White / XL)"
                },
                "files": [
                    {
                        "id": 120674338,
                        "type": "default",
                        "hash": "6238a66581153315488397a5788216b2",
                        "url": null,
                        "filename": "logo2.png",
                        "mime_type": "image/png",
                        "size": 163254,
                        "width": 1380,
                        "height": 1380,
                        "dpi": null,
                        "status": "ok",
                        "created": 1560465358,
                        "thumbnail_url": "https://d1yg28hrivmbqm.cloudfront.net/files/623/6238a66581153315488397a5788216b2_thumb.png",
                        "preview_url": "https://d1yg28hrivmbqm.cloudfront.net/files/623/6238a66581153315488397a5788216b2_preview.png",
                        "visible": true
                    },
                    {
                        "id": 120686478,
                        "type": "preview",
                        "hash": "fa1a4b2f561f28529f4230ba49eca1db",
                        "url": null,
                        "filename": "mockup-79b7c377.png",
                        "mime_type": "image/png",
                        "size": 113878,
                        "width": 600,
                        "height": 600,
                        "dpi": 43,
                        "status": "ok",
                        "created": 1560469826,
                        "thumbnail_url": "https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_thumb.png",
                        "preview_url": "https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_preview.png",
                        "visible": false
                    }
                ],
                "options": []
            }
        ]
    },
    "extra": []
}

I'm trying to access elements from files like this : 我试图从这样的files访问元素： 

foreach($variants['result'] as $variant){

//access file images
$imgurl = $variant['files']['preview_url'];

echo '<img src="$imgurl">';
echo '<br>';

}

I get errors : 我收到错误消息：

Notice: Undefined index: files 注意：未定义的索引：文件

Notice: Undefined index: preview_url 注意：未定义的索引：preview_url

Can someone explain to me what I am not understanding please? 有人可以向我解释我不了解的内容吗？

2 个解决方案

解决方案1
 0  2019-06-16 19:43:27

This code should help. 此代码应有所帮助。 Problem was connected with additional sub array. 问题与其他子阵列有关。 

foreach($variants['result']['sync_variants'] as $variant) {
    foreach($variant['files'] as $file) {
        //access file images
        $imgurl = $file['preview_url'];

        echo '<img src="' . $imgurl . '">';
        echo '<br>';
    }
}

Answer to the comment: 对评论的回答： 

foreach($variants['result']['sync_variants'] as $variant) {
    foreach($variant['files'] as $file) {
        if ($file['type'] != 'preview') {
            continue;
        }

        //access file images
        $imgurl = $file['preview_url'];    

        echo '<img src="' . $imgurl . '">';
        echo '<br>';
    }
}

解决方案2
 0 已采纳  2019-06-16 19:55:42

My guess is that, there are multiple images, not sure which one would be desired, it could be any of these: 我的猜测是，有多个图像，不确定是否需要哪个图像，可能是以下任何图像： 

$variant['files'][1]['preview_url']

or 要么 

$variant['files'][0]['preview_url']

Test 测试 

$variants = json_decode($variants, true);
$html = '';
foreach ($variants['result']["sync_variants"] as $variant) {
    $html .= '<img src="' . $variant['files'][1]['preview_url'] . '"><br>';
}

echo $html;

Output 输出量 

<img src="https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_preview.png"><br>
<img src="https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_preview.png"><br>
<img src="https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_preview.png"><br>
<img src="https://d1yg28hrivmbqm.cloudfront.net/files/fa1/fa1a4b2f561f28529f4230ba49eca1db_preview.png"><br>

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