php - PHP json_decode - 从对象、数组、对象中提取特定值
问题描述
我有这个json：
{"id":"***hidden***","event_version":"1.0","create_time":"2020-07-28T04:09:33.415Z","resource_type":"checkout-order","resource_version":"2.0","event_type":"CHECKOUT.ORDER.APPROVED","summary":"An order has been approved by buyer","resource":{"update_time":"2020-07-28T04:09:05Z","create_time":"2020-07-28T04:08:53Z","purchase_units":[{"reference_id":"default","amount":{"currency_code":"CAD","value":"50.00"},"payee":{"email_address":"***hidden**","merchant_id":"***hidden***"},"custom_id":"THISVALUEIWANT","shipping":{"name":{"full_name":"John Doe"},"address":{"address_line_1":"1 Maire-Victorin","admin_area_2":"Toronto","admin_area_1":"ON","postal_code":"M5A 1E1","country_code":"CA"}},"payments":{"captures":[{"id":"***hidden***","status":"COMPLETED","amount":{"currency_code":"CAD","value":"50.00"},"final_capture":true,"seller_protection":{"status":"ELIGIBLE","dispute_categories":["ITEM_NOT_RECEIVED","UNAUTHORIZED_TRANSACTION"]},"seller_receivable_breakdown":{"gross_amount":{"currency_code":"CAD","value":"50.00"},"paypal_fee":{"currency_code":"CAD","value":"1.75"},"net_amount":{"currency_code":"CAD","value":"48.25"}},"links":[{"href":"https://api.sandbox.paypal.com/v2/payments/captures/something","rel":"self","method":"GET"},{"href":"https://api.sandbox.paypal.com/v2/payments/captures/something/refund","rel":"refund","method":"POST"},{"href":"https://api.sandbox.paypal.com/v2/checkout/orders/something","rel":"up","method":"GET"}],"create_time":"2020-07-28T04:09:05Z","update_time":"2020-07-28T04:09:05Z"}]}}],"links":[{"href":"https://api.sandbox.paypal.com/v2/checkout/orders/something","rel":"self","method":"GET"}],"id":"something","intent":"CAPTURE","payer":{"name":{"given_name":"John","surname":"Doe"},"email_address":"sb-***hidden","payer_id":"something","address":{"country_code":"CA"}},"status":"COMPLETED"},"links":[{"href":"https://api.sandbox.paypal.com/v1/notifications/webhooks-events/something","rel":"self","method":"GET"},{"href":"https://api.sandbox.paypal.com/v1/notifications/webhooks-events/something/resend","rel":"resend","method":"POST"}]}';
如果我分解结构，它是这样的：
{
"id":"***hidden***",
"event_version":"1.0",
"create_time":"2020-07-28T04:09:33.415Z",
"resource_type":"checkout-order",
"resource_version":"2.0",
"event_type":"CHECKOUT.ORDER.APPROVED",
"summary":"An order has been approved by buyer",
"resource":{
"update_time":"2020-07-28T04:09:05Z",
"create_time":"2020-07-28T04:08:53Z",
"purchase_units":[{
"reference_id":"default",
"amount":{
"currency_code":"CAD",
"value":"50.00"
},
"payee":{
"email_address":"***hidden***",
"merchant_id":"***hidden***"},
"custom_id":"THISISTHEVALUEIWANT",
...
我想提取custom_id的值并将其存储在 php 变量中。问题是我很难找到提取这个特定项目的方法，据我所知，它是一个对象、一个数组、一个对象......
我尝试了多种组合，我尝试了 foreach 循环，到目前为止没有任何效果。
唯一真正起作用的是：
$json = json_decode($jsonobj, true); // json is stored in $jsonobj variable
foreach($json as $elem) {
foreach ($elem['purchase_units'] as $item ) {
echo $item['custom_id'];
}
}
这让我得到了我想要的值，但同时它给我抛出了一大堆E_WARNING 类型 2 错误：
Invalid argument supplied for foreach()...
Illegal string offset 'purchase_units'...
你能告诉我如何在不淹没我的 php 错误日志的情况下达到这个特定值吗？
非常感谢！
解决方案
以下内容应该适合您。我不得不处理这样一个复杂的对象结构，并且设法非常简单地做到了。
首先，需要注意的是，您提供的原始 JSON 与您基于原始构建的格式化示例不匹配。更具体地说，custom_id不在payee. 相反，它与payee. 它是这样的......
...
"purchase_units": [
{
"reference_id": "default",
"amount": {
"currency_code": "CAD",
"value": "50.00"
},
"payee": {
"email_address": "***hidden**",
"merchant_id": "***hidden***"
},
"custom_id": "THISVALUEIWANT", <--- This is what you need
"shipping": { ...
我提供的解决方案将基于原始 JSON。
<?php
$json = <<<JSON
{
"id": "***hidden***",
"event_version": "1.0",
"create_time": "2020-07-28T04:09:33.415Z",
"resource_type": "checkout-order",
"resource_version": "2.0",
"event_type": "CHECKOUT.ORDER.APPROVED",
"summary": "An order has been approved by buyer",
"resource": {
"update_time": "2020-07-28T04:09:05Z",
"create_time": "2020-07-28T04:08:53Z",
"purchase_units": [
{
"reference_id": "default",
"amount": {
"currency_code": "CAD",
"value": "50.00"
},
"payee": {
"email_address": "***hidden**",
"merchant_id": "***hidden***"
},
"custom_id": "THISVALUEIWANT",
"shipping": {
"name": {
"full_name": "John Doe"
},
"address": {
"address_line_1": "1 Maire-Victorin",
"admin_area_2": "Toronto",
"admin_area_1": "ON",
"postal_code": "M5A 1E1",
"country_code": "CA"
}
},
"payments": {
"captures": [
{
"id": "***hidden***",
"status": "COMPLETED",
"amount": {
"currency_code": "CAD",
"value": "50.00"
},
"final_capture": true,
"seller_protection": {
"status": "ELIGIBLE",
"dispute_categories": [
"ITEM_NOT_RECEIVED",
"UNAUTHORIZED_TRANSACTION"
]
},
"seller_receivable_breakdown": {
"gross_amount": {
"currency_code": "CAD",
"value": "50.00"
},
"paypal_fee": {
"currency_code": "CAD",
"value": "1.75"
},
"net_amount": {
"currency_code": "CAD",
"value": "48.25"
}
},
"links": [
{
"href": "https://api.sandbox.paypal.com/v2/payments/captures/something",
"rel": "self",
"method": "GET"
},
{
"href": "https://api.sandbox.paypal.com/v2/payments/captures/something/refund",
"rel": "refund",
"method": "POST"
},
{
"href": "https://api.sandbox.paypal.com/v2/checkout/orders/something",
"rel": "up",
"method": "GET"
}
],
"create_time": "2020-07-28T04:09:05Z",
"update_time": "2020-07-28T04:09:05Z"
}
]
}
}
],
"links": [
{
"href": "https://api.sandbox.paypal.com/v2/checkout/orders/something",
"rel": "self",
"method": "GET"
}
],
"id": "something",
"intent": "CAPTURE",
"payer": {
"name": {
"given_name": "John",
"surname": "Doe"
},
"email_address": "sb-***hidden",
"payer_id": "something",
"address": {
"country_code": "CA"
}
},
"status": "COMPLETED"
},
"links": [
{
"href": "https://api.sandbox.paypal.com/v1/notifications/webhooks-events/something",
"rel": "self",
"method": "GET"
},
{
"href": "https://api.sandbox.paypal.com/v1/notifications/webhooks-events/something/resend",
"rel": "resend",
"method": "POST"
}
]
}
JSON;
$object = json_decode($json);
$purchase_units = $object->resource->purchase_units ?? [];
$custom_ids = array_column($purchase_units, 'custom_id');
print_r($custom_ids);
输出将是：
Array
(
[0] => THISVALUEIWANT
)
现在稍微解释一下。解码 JSON 对象后，我直接使用我需要使用的属性$purchase_units = $object->resource->purchase_units ?? [];
如果不存在任何内容，则空合并运算符将允许将$purchase_units变量默认为空数组。$object->resource->purchase_units
该array_column函数允许从数组中包含的所有项目中提取特定列或属性。您可以在https://www.php.net/manual/en/function.array-column.php阅读更多相关信息
推荐阅读
- gradle - 测试运行时类路径不包含插件元数据文件“plugin-under-test-metadata.properties”
- ruby - org/jruby/RubyKernel.java:984 中的异常“LoadError”-没有要加载的文件--poi
- python - 尝试使用 python-vlc 播放多个视频时，如何在一个窗口中输出视频？
- antd - Antd：如何维护表格expandedRowRender中的Descriptions背景颜色？
- java - 如何将 Unirest 中的 JsonNode 转换为地图
- python - 不了解 CUDA 资源并不断耗尽内存
- c# - 是否可以让通用子类在 c# 中看到相同变量的不同接口
- java - 我们可以使用 rest api 更新 sharepoint 中的文档吗？
- shell - 将文件中的几列grep到shell中的另一个文件
- python - 基于python中的时间戳列连接两个数据帧