从 PHP 日志文件中提取 Json 数据答案

【问题标题】：Extracting Json Data from PHP log file [duplicate]从 PHP 日志文件中提取 Json 数据
【发布时间】：2016-05-26 06:32:06
【问题描述】：

我是php新手，这是我的 json 文件，

{"hint_data":{"locations":["AXQDAP____8AAAAABwAAABEAAAAYAAAAIwIAAERwAgAAAAAADgyCAef7TAMCAAEB","bOsDAP____8AAAAAAwAAAAcAAADFAQAAFAAAAEJwAgAAAAAANQeCAdzdTAMFAAEB"],"checksum":326195011},"route_name":["",""],"via_indices":[0,15],"via_points":[[25.299982,55.376873],[25.29874,55.369179]],"found_alternative":false,"route_summary":{"end_point":"","start_point":"","total_time":101,"total_distance":871},"route_geometry":"{_ego@m}|rhBpBaBvHuC`EuArEUtEtAlDvEnD`MlDvMli@hsEfFzn@QlTgNhwCs@fKwBjF","status_message":"Found route between points","status":0}

我只需要从 json 中提取 total_time 并将其打印到 csv 文件中，有人可以帮我吗？

【问题讨论】：

使用 json_decode 和 foreach 循环
你能写一个完整的代码吗？非常感谢。

标签： php json parsing csv

【解决方案1】：

使用json_decode，您可以从您的 json 中获取总时间。

使用json_decode 可以获得关联数组，使用索引可以访问总时间的值，如下所示。

Check online

$json = '{"hint_data":{"locations":["AXQDAP____8AAAAABwAAABEAAAAYAAAAIwIAAERwAgAAAAAADgyCAef7TAMCAAEB","bOsDAP____8AAAAAAwAAAAcAAADFAQAAFAAAAEJwAgAAAAAANQeCAdzdTAMFAAEB"],"checksum":326195011},"route_name":["",""],"via_indices":[0,15],"via_points":[[25.299982,55.376873],[25.29874,55.369179]],"found_alternative":false,"route_summary":{"end_point":"","start_point":"","total_time":101,"total_distance":871},"route_geometry":"{_ego@m}|rhBpBaBvHuC`EuArEUtEtAlDvEnD`MlDvMli@hsEfFzn@QlTgNhwCs@fKwBjF","status_message":"Found route between points","status":0}';
$assoc = true;
$result = json_decode ($json, $assoc);

echo $result['route_summary']['total_time']; //101

【讨论】：

谢谢 frayne 我会去看看。如果有大约 900 个 json 数据，我应该将其存储在一个文件中并解析该文件吗？
查看这里：3v4l.org/qiFnq
您需要跟踪从json_decode 获得的阵列。如果您能看到这一点，就不会像您想象的那样混乱。
使用您的 json sting here 并查看数组。
谢谢，Frayne，如果我需要在从 json 提取的总时间数据之后在我的文件标题“total_time”中添加一列，我该怎么办？

【解决方案2】：

首先，您将 JSON 数据解码回 PHP 对象。然后您可以访问对象的总时间属性，如下所示：

    <?php
        $json       = '{"hint_data":{"locations":["AXQDAP____8AAAAABwAAABEAAAAYAAAAIwIAAERwAgAAAAAADgyCAef7TAMCAAEB","bOsDAP____8AAAAAAwAAAAcAAADFAQAAFAAAAEJwAgAAAAAANQeCAdzdTAMFAAEB"],"checksum":326195011},"route_name":["",""],"via_indices":[0,15],"via_points":[[25.299982,55.376873],[25.29874,55.369179]],"found_alternative":false,"route_summary":{"end_point":"","start_point":"","total_time":101,"total_distance":871},"route_geometry":"{_ego@m}|rhBpBaBvHuC`EuArEUtEtAlDvEnD`MlDvMli@hsEfFzn@QlTgNhwCs@fKwBjF","status_message":"Found route between points","status":0}';
        $data       = json_decode($json);
        $totalTime  = $data->route_summary->total_time;
        var_dump($totalTime);    // DUMPS     101

【讨论】：