Question

我需要读取以下json数据，然后将每行数据打印到一个文件中。如何知道测量数据的大小？

{
   "Location":{
      "name":"rauco",
      "Sensor":{
         "sensor_type":"oxygen",
         "sensor_id":0,
         "logger_id":1,
         "Measurement 0":{
            "timestamp":1406865601,
            "oxygen":10.2,
            "temperature":12.4,
            "depth":5,
            "salinity":0,
            "status":1
         },
         "Measurement 1":{
            "timestamp":1406865661,
            "oxygen":9.9,
            "temperature":12.4,
            "depth":5,
            "salinity":0,
            "status":1
         },
         "Measurement 2":{
            "timestamp":1406865721,
            "oxygen":10.2,
            "temperature":12.4,
            "depth":5,
            "salinity":0,
            "status":1
         },

Answer 1

无论是谁设计（我不知道为什么我使用了设计这个词），这个数据结构都应该被取出并接受基础教育......然后再拍摄。

我不知道任何语言可能会期望字段或类或属性允许名称中的空格，即Measurement 0，以及使其更加糟糕的原因是json数据应该是普遍可用的任何语言。

对于设计师：没有雪茄甚至没有旧的潮湿的stoggy！

然而，这至少可以帮助您解决问题。

它被编写为以PHPCLI脚本运行，但也可以用作网页。

<?php

// create the ridiculous json data you have to use
$j = '{
   "Location":{
      "name":"rauco",
      "Sensor":{
         "sensor_type":"oxygen",
         "sensor_id":0,
         "logger_id":1,
         "Measurement 0":{
            "timestamp":1406865601,
            "oxygen":10.2,
            "temperature":12.4,
            "depth":5,
            "salinity":0,
            "status":1
         },
         "Measurement 1":{
            "timestamp":1406865661,
            "oxygen":9.9,
            "temperature":12.4,
            "depth":5,
            "salinity":0,
            "status":1
         },
         "Measurement 2":{
            "timestamp":1406865721,
            "oxygen":10.2,
            "temperature":12.4,
            "depth":5,
            "salinity":0,
            "status":1
         },
         "Measurement 3":{
            "timestamp":1406865781,
            "oxygen":10.4,
            "temperature":12.4,
            "depth":5,
            "salinity":0,
            "status":1
         },
         "Measurement 4":{
            "timestamp":1406865841,
            "oxygen":10,
            "temperature":12.5,
            "depth":5,
            "salinity":0,
            "status":1
         },
         "Measurement 5":{
            "timestamp":1406865961,
            "oxygen":8.9,
            "temperature":12.4,
            "depth":5,
            "salinity":0,
            "status":1
         }
      }
   }
}';

现在代码

$json = json_decode($j);

$x = 0;
while ( 1 ) {
    $impossible_obj_name = "Measurement $x";
    if ( isset( $json->Location->Sensor->{$impossible_obj_name}) ) {

        echo sprintf( 'timestamp: %s, oxygen %s, temperature: %s, depth: %s, salinity: %s, status: %s'.PHP_EOL,
                $json->Location->Sensor->{$impossible_obj_name}->timestamp,
                $json->Location->Sensor->{$impossible_obj_name}->oxygen,
                $json->Location->Sensor->{$impossible_obj_name}->temperature,
                $json->Location->Sensor->{$impossible_obj_name}->depth,
                $json->Location->Sensor->{$impossible_obj_name}->salinity,
                $json->Location->Sensor->{$impossible_obj_name}->status);

        $x++;
    } else {
        break;
    }
}

它应该生成它作为输出，我意识到这可能不是你真正想要的最终结果，但它演示了你将不得不用来克服灾难性数据结构设计的语法。

timestamp: 1406865601, oxygen 10.2, temperature: 12.4, depth: 5, salinity: 0, status: 1
timestamp: 1406865661, oxygen 9.9, temperature: 12.4, depth: 5, salinity: 0, status: 1
timestamp: 1406865721, oxygen 10.2, temperature: 12.4, depth: 5, salinity: 0, status: 1
timestamp: 1406865781, oxygen 10.4, temperature: 12.4, depth: 5, salinity: 0, status: 1
timestamp: 1406865841, oxygen 10, temperature: 12.5, depth: 5, salinity: 0, status: 1
timestamp: 1406865961, oxygen 8.9, temperature: 12.4, depth: 5, salinity: 0, status: 1

如何阅读Json值

1 个答案: