php - 如何用php从json数组中提取数据？

Question

我正在尝试从下面的 json 中提取 full_name 值。我已经能够使用此代码从“查询”部分中提取内容。

echo $data->query->params->granularity;

这会打印出neighborhood。

但我无法回显full_name。我猜这是因为 [] 我必须做一些不同的事情，但我对此很陌生，不知道该怎么做。

这些似乎都不起作用。

foreach ($data['places'] as $item) { ough!
echo $item->result->places->contained_within->attributes->full_name;
echo $item->result->places->full_name;
echo $item->result->full_name;
echo $item->full_name;  
}

任何帮助将不胜感激。

{
  "query": {
    "params": {
      "accuracy": 0,
      "coordinates": {
        "coordinates": [
          -122.42284884,
          37.76893497
        ],
        "type": "Point"
      },
      "granularity": "neighborhood"
    },
    "type": "reverse_geocode"
  },
  "result": {
    "places": [
      {
        "attributes": {

        },
        "bounding_box": {
          "coordinates": [
            [
              [
                -122.42676492,
                37.75983003
              ],
              [
                -122.420736,
                37.75983003
              ],
              [
                -122.420736,
                37.77226299
              ],
              [
                -122.42676492,
                37.77226299
              ]
            ]
          ],
          "type": "Polygon"
        },
        "contained_within": [
          {
            "attributes": {

            },
            "bounding_box": {
              "coordinates": [
                [
                  [
                    -122.51368188,
                    37.70813196
                  ],
                  [
                    -122.35845384,
                    37.70813196
                  ],
                  [
                    -122.35845384,
                    37.83245301
                  ],
                  [
                    -122.51368188,
                    37.83245301
                  ]
                ]
              ],
              "type": "Polygon"
            },
            "country": "United States",
            "country_code": "US",
            "full_name": "San Francisco, CA",
            "id": "5a110d312052166f",
            "name": "San Francisco",
            "place_type": "city"
          }
        ],
        "country": "United States",
        "country_code": "US",
        "full_name": "Mission Dolores, San Francisco",
        "id": "cf7afb4ee6011bca",
        "name": "Mission Dolores",
        "place_type": "neighborhood"
      }
    ]
  }
}

Answer 1

第一个问题 json 无效。问题很少。您可以在以下网站验证:http://jsonlint.com/

并且json有两个全名。因此，以下代码将有助于提取这两个全名。

$json = 'Assign the json here';
$json_array = json_decode($json);
echo $json_array->result->places[0]->contained_within[0]->full_name;
echo $json_array->result->places[0]->full_name;

• 将有效的 json 分配给单引号 (') 内的变量 $json，因为 json 有双引号。

此处提供经过测试的代码:http://sugunan.net/demo/json1.php

如果我们以您的 foreach 为例，则需要进行如下修改。但这还没有经过测试的答案。

foreach ($data['places'] as $item) {
echo $item->contained_within[0]->full_name;
echo $item->full_name;
}

以下是上面经过验证的 json。其中有几个不必要的“，”。而且它漏掉了几个括号。

{
"query": {
    "params": {
        "accuracy": 0,
        "coordinates": {
            "coordinates": [
                -122.42284884,
                37.76893497
            ],
            "type": "Point"
        },
        "granularity": "neighborhood"
    },
    "type": "reverse_geocode"
},
"result": {
    "places": [
        {
            "attributes": {},
            "bounding_box": {
                "coordinates": [
                    [
                        [
                            -122.42676492,
                            37.75983003
                        ],
                        [
                            -122.420736,
                            37.75983003
                        ],
                        [
                            -122.420736,
                            37.77226299
                        ],
                        [
                            -122.42676492,
                            37.77226299
                        ]
                    ]
                ],
                "type": "Polygon"
            },
            "contained_within": [
                {
                    "attributes": {},
                    "bounding_box": {
                        "coordinates": [
                            [
                                [
                                    -122.51368188,
                                    37.70813196
                                ],
                                [
                                    -122.35845384,
                                    37.70813196
                                ],
                                [
                                    -122.35845384,
                                    37.83245301
                                ],
                                [
                                    -122.51368188,
                                    37.83245301
                                ]
                            ]
                        ],
                        "type": "Polygon"
                    },
                    "country": "United States",
                    "country_code": "US",
                    "full_name": "San Francisco, CA",
                    "id": "5a110d312052166f",
                    "name": "San Francisco",
                    "place_type": "city"
                }
            ],
            "country": "United States",
            "country_code": "US",
            "full_name": "Mission Dolores, San Francisco",
            "id": "cf7afb4ee6011bca",
            "name": "Mission Dolores",
            "place_type": "neighborhood"
        }
    ]
}

}